SWITCHING REGULATED POWER SUPPLY MAINTENANCE MANUAL

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Publication Number 29-437R06

SWITCHING REGULATED POWER SUPPLY MAINTENANCE MANUAL

Consists of:

I nstallation Specification Maintenance Specification Schematic

Chassis Assembly Schematic Chassis Assembly Component Locator Component Locator Component Locator Schematic

Component Locator

34-026R01 A20 34-026R01A21 34-026R06008 34-026R02003 34-027 R07008 34-027R02003 11-179R04003 35-581 R07C03 35-582R03003 34-029008 34-029003

THIS MANUAL CONTAINS PROPRIETARY INFORMATION AND IS SUPPLIED BY INTERDATA FOR THE SOLE PURPOSE OF USING AND MAINTAINING INTERDATA SUPPLIED EQUIPMENT AND SHALL NOT BE USED FOR ANY OTHER PURPOSE UNLESS SPECIFICALLY AUTHORIZED IN WRITING .

• :-==---:-=-:El::EC, ^I ^.~ ^.... ^..a;:

Subsidiary of PERKIN-ELMER

Oceanport, New Jersey 07757, U.S.A.

September 1976

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PAGE REVISION STATUSjSHE:ET PUBLICATION NUMBER

29-417

TITL.E

S:\tli.t.ching Regula;ted Power Supply },fain tenance !:1anual

REVISION R'.0~6 DATE

September 1976

REV.

34- 026

l'~20

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34-026R01A20 May 1976

SWITCHING REGULATED POWER SUPPLY INSTALLATION SPECIFICATION

INTRODUCTION

INTERDATA Digital Systems feature a highly modular structure which permits configurations to suit the user's exact needs. This structure provides the means for convenient expansion as the user's requirements grow. This document describes the power supply mounting and the interconnecting cables. Note that the following discussion assumes that the equipment is mounted in standard INTERDAT A cabinets.

POWER SUPPLY MOUNTING

The power supply mounts in the rear of the cabinet, behind the Processor or expansion chassis. It is attached to the right mounting upright (looking from rear) via four 10-32 pan head Phillips screws.

WARNING

BEFORE HINGING OUT THE POWER SUPPLIES, THE RACK LEVELING FEET SHOULD BE LOWERED. AFfER THE LEVELERS ARE IN CONTACT WITH THE FLOOR SURFACE, UP TO THREE POWER SUPPLIES MAY BE HINGED OUT AT ONE TIME.

When the power supply is in the installed operating position, it is secured to the left rear upright by two 10-32 screws. The power supply cable connects to terminal lugs at the right rear (looking from rear) of its respective Processor or expansion chassis via Faston lugs and a connector for fan AC power. There is adequate slack provided in the cable to allow the power supply to hinge out freely. To prevent the cable from being pinched between the power supply and the chassis support rails, a service loop is required. A maximum of five power supplies may be mounted in one rack.

Refer to the related Processor manual installation specification for expansion chassis/power supply mounting details.

PRIMARY POWER CONVERSION

The primary power may be 115 VAC or 230 VAC

±

10%, 47 to 63 Hertz (Hz), depending on the strapping options shown on TemIinal Board 1 (TB1) in the functional schematic for the given power supply. INTERDATA power supplies are shipped from the factory strapped for 115 volts

±

10%.

34-026A20 ROI 5/76

This information is proprietary and is supplied by INTERDATA for the sole purpose of using and maintaining INTERDATA supplied equipment and shall

not be used for any other purpose unless specifically authorized in writing. 1

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Conversion Procedure

CABLING

1. Remove the top and rear panel (one piece) from the power supply chassis to expose TB 1.

2. Ascertain that the TBI terminals are strapped in the following manner for the 115 VAC option.

1 to 2 3 to 4 5 to 6 8 to 9 3. Remove the four straps from TBI.

4. For 230 VAC option, add four straps to TBI terminals as listed:

2 to 3 (use two straps) 4 to 5 (use two straps) NOTE

Two straps are used for each connection to keep four straps available in the event the 115 VAC option is later desired.

5. Replace the top and rear panel (one piece) on the power supply chassis.

6. When the conversion to 230 VAC is completed. label the supply "Connected for 230 VAC Operation".

WARNING

WHENEVER THE POWER SUPPLY IS CONNECTED TO A PRIMARY POWER SOURCE, 115 VAC OR 230 VAC (DEPENDING ON THE LINE VOLT AGE) IS PRESENT AT TBI (1C4) AND THE PRIMARY OF THE 12 VAC CONTROL TRANS- FORMER Tl (1E6).

All INTER DATA power supply output cables are equipped with Fastons which are intended to connect to the Faston tabs located on back panels of INTERDATA chassis. The Fastons and the Faston tabs are labeled to conveniently guide the installation of power supplies. The fan connection does not use Fastons. It uses a three prong nylon connector (only two prongs are used by the fans).

NOTE

Some power supplies are equipped with output cables designed to feed two back panels.

POWER SUPPLY EXPANSIONS

All power supplies covered by this manual may be expanded as shown in Figure 1. Turning the Display Panel Power LOCK-ON-OFF-switch to the ON position connects 12 VAC to Relay K of the first Power Supply. Relay K, in tum, applies power to the first Power Supply. It also closes Contact C which is connected to the next Expansion Card File via wires CI Rand C2R which are part of the first power supply output cable. The second power supply is therefore turned on because its Relay K is energized through the first power supply's Contact C. The second power supply's Contact C can tum on a third power supply and so on, until all power supplies in the system are on. Up to 10 power supplies can be controlled in this manner.

EXPANDING OLDER SYSTEMS

The power supplies described in this document may be added to older systems which use 34-017, 34-020, or 34-024 Power Supplies. See Figure 2 for the connections requited. Note that the older power supplies do not provide a contact to control the next power supply, but rather share the Display Panel Power LOCK-ON-OFF switch with all power supplies in the system. An INTERDATA Part Number 17-182 Cable is needed for each expansion supply, as shown.

2

ThIS information IS proprietary and IS supplied by INTERDATA for the sole purpose of lIsing and maintain'"9 I NTER DATA supplied equipment and shall

not be used for any other purpose unless specifically authorized in wrtting. 34-026A20 ROO 5/75

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I

DISPLAY PANEL POWER ON-OFF SWITCH

r--*-r

PROCESSOR

I

^C1

CARD FILE

C2 C3

EXPANSION

Cy

CARD FILE

C2...,...

...

C3

NOTE: CONNECTIONS SHOWN PERTAIN TO POWER SUPPLY 34-026 AND OTHERS DESCRIBED IN THIS MANUAL

C1 12 VAC

sf

C2 C3 C1R

C2R

t

^C

C1 12 VAC

sf

C2 C3 C1R

C2R

t

^C

TO C1 + C2 OF NEXT CARD FI LE

1

Figure 1. Power Supply Expansions

DISPLAY PANEL POWER ON-OFF SWITCH

r-*-

PROCESSOR CARD FILE

C1 12 VAC

-...

BT

C2

"'

C3

17-182 CABLE EXPANSION

CARD FILE

C1 C1 12VAC

"' BY

C2 C2

...

C3 C3

C1R

C2R

f

^C

1

TO NEXT SUPPLY IF REQUIRED

1st POWER SUPPLY

EXPANSION POWER SUPPLY

1st POWER SUPPLY 34-0 J 7, 34-020 0 R 34-024

EXPANSION SUPPLY 34-026 OR OTHER SUPPLY DESCRIBED BY THIS MANUAL

Figure 2. Power Supply Expansion, Systems Using Previous Power Supplies

34-026A20 ROJ 5/76

This informatio" IS proprietary and is-~~~ied by INTERDATA f~r-;;;;;--;;:'I;J

purpose of using and maintaining INTERDATA supplied equipment and shall I

,--n_o_t _be_U_Sed_fo_r _an_y _o_t_he_r _pu_rp_o_se_u_nie_ss_s_pe_ciT_ljc_all.:....y _au_th_o_r_iZE'_d_in_w_r_iti.n9. j 3/4

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34-026RO 1 A21 May 1976

SWITCHING REGULATED POWER SUPPLY MAINTENANCE SPECIFICATION

INTRODUCTION

This specification provides maintenance infonnation for several INTERDATA power supplies. These power supplies are very similar in their basic design approach. A given power supply described by the marketing num ber (a num ber preceded by M, such as M49-026) may have several variations. The variations are identified by INTERDATA part numbers-a number beginning with 34 (such as 34-026). All power supplies described by the marketing number have the same output rating and are interchangeable. The following is a list of the power supplies described in this document.

Marketing Number M49-026

M49-034

Part Numbers P5 Output Rating

50 Amperes

50/40 Amperes (See Output Specifications) M49-024

34-026 34-027

34-029 24 Amperes •

The Switching Regulated Power Supply Maintenance Manual, Publication Number 29-437 provides a schematic drawing, chassis assembly drawing, and component locator drawings (printed circuit board) for each power supply listed above. All drawings appear at the back of the manual. The following list describes the drawings that apply to each power supply.

Power Supply Part Number 34-026 34-027 34-029

GENERAL SPECIFICATIONS 34-026 POWER SUPPLY Input

Chassis

Schematic Assembly

34-026008 34-026003

34-027008 34-027003

34-029008 34-029003

115 or 230 V AC

±

10%, 50 or 60 Hz Outputs

Regulation

Mnemonic P5 Pl5 Nl5

Mnemonic P5 PIS N15

Ripple (Maximum Peak to Peak) Mnemonic P5 P15 Nl5

34-026A21 ROI 5/76

Normal Voltage + 5.0 VDC +16.5 VDC -16.5 VOC

±1.5% (Load and Line)

±1 % (Load and Line)

120 Millivolts 300 Millivolts 300 Millivolts

Current Rating 50 Amperes 3.8 Amperes 3.8 Amperes

This information is proprietary and is supplied by INTER DATA for the sole purpose of using and maintaining INTERDATA supplied equipment and shall not be used for any other purpose unless specifically authorized in writing.

Component Locator 35-581C03 35-582003 11-179003 35-581C03 35-582003 11-179D03 35-581C03 35-582003 11-179003

1

I

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Temperature Range

Operating O°C to 55°C Storage -40°C to +85°C Over Voltage Protection

P15 N15 P5 Output Current Limiting

P5 PIS N15 34-027 POWER SUPPLY Input

115 or 230 V AC + 10%, 50 or 60 Hz Outputs

Regulation

Mnemonic PS PIS NlS

Ripple (Maximum Peak to Peak) Mnemonic PS PIS NlS Temperature Range

Operating O°C to 55°C Storage-40°C to +85C Over Voltage Protection

PIS NI6 PS Output Current Limiting

Output PS PIS NI5

Crowbar Crowbar None

Short Circuit Output Current Limit (Typical) 30 Amperes

2.5 Amperes 2.5 Amperes

Nom1al Voltage +5.0 VDC +16.5 VDC -16.5 VDC

±1.5% (Load and Line)

±l % (Load and Line)

120 Millivolts 300 Millivolts 300 Millivolts

Crowbar Crowbar None

Short Circuit Output Current Limit (Typical) 30 Amperes

2.5 Amperes 2.5 Amperes

19.8 ±1.3 VDC (no adjustment) 19.8 ±1.3 VDC (no adjustment) N/A

Option 1 Current Rating 50 Amperes 3.8 Amperes 3.8 Amperes

Option 2 Current Rating 40 Amperes 5.0 Amperes 5.0 Amperes

19.8 ±1.3 VAC (No Adjustment) 19.8 ±1.3 V AC (No Adjustment) N/A

2

This information is proprietary and is supplied by INTER DATA for the sole purpose of using and maintaining INTERDATA supplied equipment and shall not be used for any other purpose unless specifically authorized In writing.

34-026A21 ROO 5/75

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THEORY OF OPERATION

This section describes the operation of the 34-026 Power Supply. All power supplies covered by this manual operate in a similar manner. Refer to the Block Diagram, Figure 1, and to Functional Schematic 34-026D08 provided in the Switching Regulated Power Supply Maintenance Manual, Publication Number 29-437 during the following descriptions.

Block Diagram Description

The Display Panel LOCK-aN-OFF switch connects 12 VAC to ]<elays K201 and K202 to power-up a system. Contacts of K201 and K202 connect the line to the Rectifier and Filter circuJ through a Line Filter and Surge Resistor. An additional contact on K20l energizes the next expansion supply via C1 R a:ld C2R. The Surge Resistor prevents line surges when the supply is initially turned on, and is shorted after the first secon d of operation by Relay K10 1. The Rectifier and Filter Circuit produces 300 VDC from the AC line. The Power Stag.~ converts the 300 VDC to a 20KHz square wave and transforms the high voltage down to appropriate levels for the 5 Volt output and ±16 Volt Regulators. The 5 Volt output (P5) is produced by full-wave rectification into a Choke Input Filter. The Control Circuit senses the 5 Volt output and regulates it by controlling the duty cycle of the 20KHz Power Stage.

A -30 Volt Rectifier is supplied from a winding of the Power Stage Power Transformer. The -30 Volt Rectifier provides unregulated DC voltage to the -16 Volt Regulator which produces the -16 Volt output (N15). A remote thermistor located in the memory system connects to the Power Supply through the output cable to program the -16 Volt Regulator over a range required by the memory (usually -15 to -18 Volts).

The same winding on the Power Transformer that supplies the -30 Volt Rectifier also supplies the +30 Volt Rectifier. The +30 Volt Rectifier supplies DC voltage to the +16 Volt Regulator which produces the +16 Volt output (PIS). The +16 Volt Regulator tracks the -16 Volt Regulator. The Control Transformer supplies 24 VAC to half-wave rectifiers which

"pre-charge" the +30 Volt and -30 Volt Rectifier filter capacitors during the One Second Tum-On Delay. Relay K101 contacts then transfer the Rectifier outputs to their respective regulator circuits. The pre-charge prevents excessive stress on the Power Stage High Voltage Transistors by not requiring them to charge the filter capacitors from 0 to 30 Volts at the instant the Power Stage is enabled during the Power-Up sequence.

The Control Transformer also supplies the 20 Volt Rectifier which supplies a localS Volt and 12 Volt Regulator. These two regulated voltages are used to power the Power Supply's Control Circuit only.

The Time Delay Enable generates the One Second Turn-On Delay and the Enable signals which start the Control Circuit.

K101 300

LINE K201 LINE

~

^RECTIFIER ^VDC ^POWER

FILTER AND STAGE

FILTER

f I

~

^{+30 VOLT} ^v_

^J

^{+16 VOLT}

C1R RECTIFIER

t ' ¹

^REGULATOR ^I

;=J

^K201 ^~

^...

^K101

H

^{-30 VOLT} ^J

t

^v

^-l

^J ^REGULATOR^{-16 VOLT}

~24 VAC RECTIFIER

....

^K101

f

CONSOLE ON-OFF

...

SWITCH

+5 VOLT P5

" K202 ^~RECTIFIER

L

AND FILTER

1

VOLTAGE SENSE

CONTROL

I

CURRENT SENSE

TRANSFORMER

•

34-026A21 ROO 5/75

P5 CONTROL CIRCUIT

K202

1

16 VAC +18 VOLT LOCAL +5 VOLT

RECTIFIER f---- AND +12 VOLT

AND FILTER REGULATORS

I

Figure 1. Functional Block Diagram

This information is proprietary and is supplied by INTERDATA for the sole purpose of using and maintaining INTERDATA supplied equipment and shall not be used for any other purpose unless specifically authorized in writing.

P16

N16

: THERMISTOR

1 ~

TIME DELAY ENABLE

1

3 1

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Circuit Descriptions

The following paragraphs describe each block of the Block Diagram, Figure 1. Refer also to Functional Schematic 34-026D08 during the following discussion. The three digit coordinates in parentheses locate the circuit area or component being described. For example: (1 K7) .locates Q9 in Functional Schematic 34-026D08. The first digit (1) refers to Sheet 1 of the schematic. The next two digits (K7) are the coordinates on Sheet 1 at which Q9 is shown.

Rectifier and Filter (115 V AC Connection)

When the Power Supply is connected for 115 V AC line operation, the Rectifier is connected as a doubler, producing 300 Vnc. For the first second following tum-on (closing of Relay K201 contacts), contacts of K101 (1 H2) remain open and the Power Supply regulator circuits are disabled. With Relay KI0 1 contact 0 H2) open, the filter capacitors must charge through the Surge Resistor R20l (1 E2) preventing tum-on surges from causing malfunction in equipment that had already been in operation. During the One Second Tum-On Delay, the P5, PIS, and NlS Regulators are disabled and take no power from the Filter Capacitors ClIO, CllL Cl12, and Cl13 (2C2) allowing them to fully charge. Fuse F7 (lF2) protects the Surge Resistor (R20l) in the event of a Power Supply malfunction.

Rectifier and Filter (230 VAC Conne~tion)

When the Power Supply is connected for 230 VAC operation, a Bridge Rectifier Circuit is used rather than a doubler as in the 115 V AC connection. However, in either case, the rectifier output is approximately 300 VDC. Removing the strap between Terminal Board 201- Pin 8 and Pin 9 (1 CS) converts the Rectifier (BR20 1) from a doubler to a bridge configura- tion.

Power Stage

The Power Stage uses four High Voltage Transistors Q1 01, Ql 02, QI03, and Q104 (2G2) to switch the rectified line (300 VDC) through T301 (2H1) at a 20KHz rate. Capacitors C10l and CI02 actually divide the 300 Volts into two 150 Volt sources. Transistors Q101 and Ql02 switch the upper 150 Volt source to T301 winding (1-2) and Q103 and Ql04 switch the lower 150 Volt source to T30l winding (3-4). Base drive to Q101 and Q102 is supplied through T1 02 (2F3). Base drive to Ql03 and Q104 is supplied through Tl03 (2G3). Integrated Circuits IC 6 and IC 7 (2G6) control the base drive to the High Voltage Transistors. A low drive level is supplied to T102 and T103 by Resistors R20 and R21 (2F6) respectively.

Current Transformer TIOI supplies additional drive power to the High Voltage Transistor bases (through T102 and TI03) as currents through these transistors increase due to increased loading of T30l secondaries. Darlington connected Transis- tors Ql and Q2 (2CS) provide tum-off drive to the High Voltage Transistors. Transistors Ql and Q2 are on when IC 6 and IC 7 are both off. Transistors Ql and Q2 are off when either IC 6 or IC 7 is on. Current for the tum-off drive is supplied by TlOl and T301 winding 01-12-13) to Tl02 and TI03 in proper phase. Diodes steer the positive polarities of TIOI and T301 winding 01-12-13) to TI02 and T103 in proper phase. Diodes also provide necessary isolation of all transformers from each other during unwanted phases of the 20KHz cycle. An Enable voltage supplied to R20 and R21 allows the circuit LO start. Without this Enable voltage the circuit can not tum the High Voltage Transistors on. This Enable voltage is supplied by the Control Circuit and is described in the Control Section.

+30 Volt and -30 Volt Rectifiers

Two Full-wave Rectifiers CRlOl, CRI02, CRI03, and CRI04 (212) provide +30 VDC and -30 VDC. These levels supply the +16 Volt and -16 Volt Regulators. Pi filters are used for both polarities. Half-wave Rectifiers CR22 and CR23 (3C6 and 3D8) pre-charge the Filter Capacitors Cl 04, ClOS. Cl06, and Cl07 (2K2) during the One Second Tum-On Delay. Relay KlOl contacts (3Dl and 3E9) transfer the +30 Volt and -30 Volt Rectifier output from the pre-charge rectifiers to the +16 Volt and -16 Volt Regulators following the One Second Tum-On Delay.

-16 Volt Regulator

Integrated Circuit IC 10 (3F6) provides a negative voltage reference and error amplifier which drives the -16 Volt Pass Transistors Q108 and Ql09 (3G9). Resistors RS9, RS4, RS3, and RS7 (3H6) together with an external Thermistor and Transistor Q7 (3H7) comprise a temperature programming reference divider network. Transistor Q8 (3K8) senses NlS output current through Rl19 and, with Q6 (318), R41. R42 (3K8), R39, R4S (3D6), and CR21 (3K7) providing fold-back current limiting. A fixed Threshold Crowbar provides over-voltage protection. The firing point is 19.8 volts, ±1.3 volts. The NlS Crowbar Circuit includes CR31, Q4, CR19 and associated resistors (3K7).

If the PS output is shorted to ground, a shut down mode of the -16 Volt Regulator (IC 10) is entered into. When the PS output is shorted to ground, IC 1, Pin 12 (217) is driven negative. This negative voltage is coupled to IC 10, Pin 2 (3E6) through R60 (218) and CR34 (3D7) causing the NlS output to go to approximately 0 Volts.

+16 Volt Regulator

Integrated Circuit IC 9 (3E4) provides an error amplifier which drives the +16 Volt Pass Transistors QlOS and Ql06 (3G1), The +16 Volt Regulator tracks the -16 Volt Regulator and therefore uses N15 as its reference. The +16 Volt Reference Divider includes R44, RS6, and R43 (314). Transistor QS (3J4) senses the +16 Volt Regulator output current through Rl17 and' together with R31 (3H4), R36 (3D4), R3S (3DS), and CR18 (3GS) provides fold-hack current limiting (approximately 2 Amperes) when PIS output is shorted to ground. A fixed threshold Crowbar provides over-voltage protection. The firing point is 19.8 volts, ±1.3 volts. The PIS Crowbar Circuit includes CR32, Q3, CR20 and associated resistors (3 L4).

4

T!1,S ;nformatlon is proprietary and IS suppEed by INTERDA"TA for the sale.

purpose of USing and malntaimng It\JTERDATA. supp!'ed equ pme:1t aTld shell I

not be used fo~ any other purp0se, un:es,s spec:flca!ly autr~;r'zea .~ wri t·19· 34-026A2l ROO 5.175

(10)

S Volt Rectifier and Filter

Schottky Rectifiers CR301 and CR302 (2J4) rectify up to 50 Amperes of P5 output current. Pulsating DC is filtered through Inductor L301 and Capacitors C301 and C302 (2L4). Output current flowing through Resistor R301 provides a current sensing signal for the P5 Control Circuit.

NOTE

Typical resistance measurements of Schottky rectifiers are:

Triplett Type 630 VOM Auke 8000A DVM

Good Forward 1.1 Ohm (XI Scale) 162 Ohm (200 Ohm

Scale)

Good Reverse

.22 Meg Ohm (XIOOK Scale) 8.2K Ohm (200K Ohm Scale)

Two test points accessible from outside the Power Supply are provided to monitor P5 output current. These test points produce 6 Millivolts/Ampere of P5 output current. Any signal measuring greater than 315 Millivolts at these test points (as measured with a DVM) indicates an overloaded power supply.

PS Control Circuit

The P5 Control Circuit monitors the P5 output voltage and regulates the duty cycle of the Power Stage to maintain the P5 output at 5 Volts in spite of load variations or input line variations. The P5 output current is also monitored and controlled to prevent overloading the Power Supply.

A 5 Volt reference is established by IC 2 (2K9). Integrated Circuit IC 1 (2H9) compares this reference to the P5 output voltage and produces an error signal at its output, Pin 10. Integrated Circuit IC 4 (2C9) generates a pulse every 25 microseconds. The pulse triggers IC 3 (2E8) a one-shot m ultivibrat or. The one-shot timing components are Capacitor C9 (2F8) and Resistor Rl5 (2G9). The error signal from IC 1 Pin 10 modifies the one-shot timing pulses over a range from 2.5 microseconds to 25 microseconds. It is the output pulse from this one-shot that controls the duty cycle of the Power Stage. The variable width pulses from IC 3 Pin 8 are applied to the two drivers, IC 7 (2G7) and IC 6 (2F6).

The driver ICs are alternately enabled by the IC 5 flip-flop (207) which changes state every time the one-shot generates a pulse. The driver ICs supply base drive to High Voltage Switching Transistors Q101, Q102, Q103, and Q104 (2G2) through the Driver Transformers T 1 02 and T 103 (2F3) as described previously.

Integrated Circuit IC 1 (217) also monitors the P5 output current flowing through a six milliohm resistor, R301 (2K4). If the P5 output load starts to draw current in excess of 57 Amperes, IC 1 (217) output Pin 12 goes negative and overrides the error signal from IC 1 (2H8) Pin 10. This changes the one-shot timing (lC 3) and reduces the Power Stage duty cycle, or "on" time to limit the output current to safe levels.

20 Volt Rectifier and Filter

Diodes CR24, CR25, CR26, and CR27 0 H6) form a bridge-rectifier which produces unregulated +17 VDC from a 14 VAC winding of Control Transformer T201 (1 ES). The voltage is supplied to the 12 Volt Regulator and IC 2 (1 M7).

+S Volt and +12 Volt Regulators

Zener Diodes CR28 (1 K7) and CR29 (1 K7), together with Resistor RS1 and Transistor Ql1 (1 K6), provide a regulated 12 Volts for the PS Control Circuits described previously.

Integrated Circuit IC 8 OMS), a three terminal regulator, produces +S Volts to operate IC 3, IC 4, IC S, IC 6, and IC 7 in the PS Control Circuit.

Time Delay Enable

The function of the Time Delay Enable is to Enable the PS Control Circuits only when adequate control voltages (+12 Volts and +5 Volts) are present. Also, on normal power-ups, a one second time delay is provided to allow high voltage Capacitors C 110, Cl11, Cl12, and Cl13 (2G2) to charge through the Surge Limiting Resistor R201 (1 E2) as described earlier.

Turning on power closes Relay K202 (1 F6), allowing C25 (117) to charge. As soon as sufficient voltage exists on C25 to permit zener current in CR28 and CR29 (1 K7), Q1 0 (1 K8) turns on, which cuts off Q9 (l L7).

Cutting off Q9 allows C26 (1 K8) to charge. Integrated Circuit IC 2 (1 N7) with feedback Resistor R29 (1 M8), together with R28, R3, and R4 (1 M7) comprise a Schmitt Trigger. Integrated Circuit IC 2 output Pin 10 remains at less than 3 Volts until C26 charges to the threshold voltage established by R3 and R4 (about +3 Volts). It takes about one second for C26 to charge to the threshold voltage, at which time IC 2 output Pin 10 switches to about +12 Volts. This +12 Volt output enable signal is applied to the Power Stage as described previously, and permits the Power Supply to operate. Without the + 12 Volt Enable signaL the Power Supply cannot operate.

34-026A21 ROO 5/75

This information is r,roprietary and is supplied by INTERDATA for the sale I purpose of u;;;,,; ond maintaining INTERDATA s~pplied equipment aod ;hail

not be used for any other purpose unless specifically autnorized in wr;ting. S

(11)

ADJUSTMENTS

There are three potentiometer adjustments on the 34-026 Power Supply. They are the output voltage adjustments for P5, P15, and N15. Consult the appropriate systems maintenance manual for adjustment procedures. Typical adjustments are:

P5 = 5.0 Volts } Pl5 = 16.5 Volts Nl5 = 16.5 Volts

at 25° C Ambient

Adjustment Potentiometers are located on the side of the Power Supply opposite the hinged end.

NOTE

Since the PIS Regulator tracks the NlS Regulator, always adjust the Nl5 output before adjusting the PIS output.

VOLTAGE MEASUREMENTS

Table 1 lists typical voltage measurements for an operating Power Supply. Other voltage measurements are shown on the schematic for any Power Supply covered by this manual.

TABLE 1. TYPICAL VOLTAGE MEASUREMENTS (A.C. IN PEAK TO PEAK VOLTS)

PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14

IC D.C. .18 .20 -10.0 5.0 5.0 12.5 4.4 11.4 12.5

1 AC. .2 .06 1.0 .01 .03 1.0 .1 -. 1.0 1.0

IC D.C. 2.7 8.2 7.1 0 12.1 12.5 16.8

2 AC. .2 .2 .01 .005 2.0 1.0 1.0

IC D.C. 0 0 4.5 5.0 5.0 0 1.6 5.0 5.0 1.6 1.5 5.0

....

..) AC. .005 .005 5.0 .005 .005 .005 5.0 .005 .005 .01 1.0 .005

IC D.C. 0 2.3 4.6 5.0 2.3 2.3 5.0 -- -- -- -- -- --

4 AC. .01 2.8 4.4 .01 2.8 3.6 .005 -- --

--

^-- ^-- ^--

IC D.C. 5.0 1.9 1.6 5.0 1.9 1.9 0 5.0

5 AC. .005 3.6 3.4 .01 3.4 3.6 .01

IC D.C. 1.6 1.9 10.2 0 10.2 1.6 1.9 5.0 -- . - .. .. .. ..

6 AC. 3.4 3.4 20.0 .01 20.0 3.4 3.4 .01 .. .. .. .. .. ..

IC D.C. 1.6 1.9 10.2 0 10.2 1.6 1.9 5.0 ^.. ^.. ^.. ^.. .. ..

7 AC. 3.4 3.4 20.0 .01 20.0 3.4 3.4 .01

IC D.C.

.76' ^~1 ^~o

8 AC. .01 .05 .01

IC D.C. 17.6 29.0 19.0 0 0 ^.. -- ^_. ^-2.9

9 AC. .1 .3 .1 .01 .01 .01

IC D.C. -3.5 -15.2 -29.0 -28.2 -16.8 -26.9 -16.6 -16.6 0

10 .01 .01 .3 .2 .1 .4 .005 .005 .01

CURRENT MEASUREMENTS

The P5 output current loading can be checked by measuring the voltage across two test points. These test points are accessed from the side of the supply opposite the hinged end. Test point calibration is 6 Millivolts/Ampere (±5%). A supply is over-loaded when test point voltage measures greater than 315 Millivolts.

TEMPERATURE PROGRAMMING

An external thermistor may program the PI5 and Nl5 Regulator. Two voltage vs temperature relationships are used by INTERDATA. Refer to the appropriate Memory Maintenance Ma.nual or to the Memory Section of the System Mainten- ance Manual of the particular system in point to determine which voltage vs temperature characteristic is required.

6

This information is proprietary and is· supplied by INTERDATA for the sole purpose of using and maintaining INTERDATA supplied equipment and shall

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7

SWITCHING REGULATED POWER SUPPLY MAINTENANCE MANUAL