Siemens Saturn Iie Epabx General Description Manual
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SATURN IIE EPABX Maintenance and Troubleshooting Figure 2.08 is a block diagram which shows the ac power in- put to the Power System Unit and ac power distribution to the various system power supplies via the PSU circuit break- er panel. All circuit breakers and fuses are mounted on the PSU front panel. (Refer to Figure 2.01.) Figure 2.09 shows the layout of input/output connectors and terminals on the rear panel of the PSU. Table 2.00 lists the designations and func- tions of these connectors and terminals. Figure 2.10 is a block diagram showing the fusing of -48 volt outputs from the -48PS module(s). As shown, these -48 volt outputs are supplied to the Basic and LTU Shelves and the Ring Generator (RGEN) module. Also shown is the fusing of the RAClRMW (ringing signal) output of the Control Logic Board which is distributed to the Basic and LTU Shelves. The function and consequences of a failure of each of these modules is described below: a. Power System Unit (PSU). The PSU performs a num- ber of major functions in the SATURN IIE System. It A30808-X5130-DllO-l-8920 Issue 1, May 1986 provides (1) dc voltages necessary for operation of the Lineflrunk and Common Equipment PCBs in the Basic Shelf and Floppy Disk Drives FDDO and FDDl, (2) ac distribution-to and circuit breaker protection on the ac inputs of all system power supplies, (3) -48Vdc distri- bution and fuse protection on the -48PS outputs to the Basic Shelf and optional LTU Shelf(s), (4) it generates and provides synchronization of the ringing (RACIRMW) signal and provides fuse protection and distribution of the ringing signal to the Basic Shelf and optional LTU Shelf(s), (5) it provides-fuse, voltage, and alarm detection and monitoring, and (6) failure trans- fer control and major and minor alarm indications when a failure or alarm condition is detected. In addition to the above, the PSU provides mounting facilities and power input to the optional Memory Support Module (MSM) when it is provided in the system. The various circuits and components that make up the PSU are list- ed and described below. Refer to Figure 2.11 for a block diagram of the PSU. . , 2-16
SATURN IIE EPABX Maintenance and Troubleshooting A30808-X5130-DllO-l-8920 Issue 1, May 1986 LINE AC IN (AC #O IN LINE AC IN (AC #1 -- W l * J5 s ,.I LTUPSl l I P/O LTU SHELF 2 (EXPANSION CABINET) LTIlPS2 l I P/O LTU SHELF 3 (EXPANSION CABINET) P/O LTU SHELF 1 (BASIC CABINET) / Jl + -48PSl l l OPTIONAL DEPENDING UPON CUSTOMER/ SYSTEM REQUIREMENTS. l * SECOND AC INPUT IS REQUIRED WHEN EXPANSION CABINET IS USED. JUMPER PLUG AT J2 IS REMOVED AND SECOND AC SOURCE IS WIRED TO J2. (REQUIRED WHEN EXPANSION CABINET IS USED) Figure 2.08 Block Diagram of AC Input to Power Supply Assemblies and Modules 2-17 .
SATURN IIE EPABX Maintenance and Troubleshooting A30808-X5130-DllO-l-8920 Issue 1, May 1986 Ftgure 2.09 Layout of Connectors and Terminals on PSU Rear Panel . 7-18
SATURN IIE EPABX Maintenance and Troubleshooting A30808-X5130-DllO-l-8920 Issue 1, May 1986 PSU -mm---- rP/O CIRCUIT j I BREAKER , * OPTIONAL DEPENDING UPON CUSTOMER/ SYSTEM RECIUIREMENTS J& TO BASIC SHELF I (BASIC CABINET) b TO LTU SHELF 1 * : (BASIC CABINET) TO LTU SHELF 2 * (EXPANSION CABINET) & TO LTU SHELF 3 * (EXPANSION CABINET) J7 TO BASIC SHELF I (BASIC CABINET) &, TO LTU SHELF 1 * (BASIC CABINET) TO LTU SHELF 2 * (EXPANSION CABINET) & TO LTU SHELF 3 ’ ; (EXPANSION CABINET) ! !?+ TO BASIC SHELF ’ (BASIC CABINET) & TO LTU SHELF 1 * (BASIC CABINET) ; J& TO LTU SHELF 2 * I (EXPANSION CABINET) & TO LTU SHELF 3 * (EXPANSION CABINET) Figure 2.10 Fusing of -48 Volt Outputs from -48PS0 and -48PSl 2-19
SATURN IIE EPABX Maintenance and Troubleshooting Table 2.00 Functions of Connectors and Terminals on PSU Rear Panel DESIGNATION FUNCTION Note: Refer to Figure 2.09. _ - Jl AC power input (AC#O IN) for distribution to PSU Power Supply Board, LTU Shelf power supplies, and -48PS0 if system consists of Basic Cabinet only J2 AC power input (AC#l IN) to -48PS0 and -48PSl in systems consisting of Basic and Expansion Cabinets. Otherwise, provides jumper plug connection for routing ac power to -48PS0 via PSU Circuit Breaker Panel J3 J4 J5 J6 AC power to LTUPSO in LTU Shelf 1 AC power to -48PS0 and -48PSl AC power to LTUPSl (LTU Shelf 2) and LTUPS2 (LTU Shelf 3) in Expansion Cabinet -488 and -48P inputs from -48PS0 and -48PSl; +5V and +12V distribution to FDDP (not equipped at this time) J7 J8 J9 JlO Jll J12 -488, -48R and RAClRMW distribution to Basic and LTU 1 Shelves in Basic Cabinet -48B, -48P, and RAClRMW distribution to LTU Shelves 2 and 3 in Expansion Cabinet +5V distribution to Basic Shelf (busbar lug connections) -5V, +5VB, -12V, and +12V distribution to Basic Shelf +5V and +12V distribution to FDDO and FDDl SYNR+, FUSA+, BATPOK-, and VFAlLc to Basic Shelf. ERING-, MINALM+, and MAJALM+, from Basic Shelf. J13 Failure Transfer Control, Major and Minor Alarm Status, and Maintenance Telephone to MDF J14 DC. GND (busbar lug connections) J15 EXT FUSE ALM (external fuse alarm input; disabled when jumper is installed) J16 MSMlLCL jumper for +5V memory power I - . . 2-20
SATURN IIE EPABX Maintenance and Troubleshooting I - A30808-X5130-DllO-l-6920 Issue 1, May 1986 1. Front Panel Fuses, Controls, and Indicators. The following are mounted on or visible through open- ings in the PSU front panel: l Fuses for all -48Vdc and ringing (RACIRMW) voltages to the Basic and optional LTU Shelves (part of Circuit Breaker Panel) l Circuit breakers for ac inputs to all system pow- er supplies (part of Circuit Breaker Panel) l MAJOR (red) and MINOR (yellow) alarm (ALARMS) indicators (part of Control Logic Board) l FAILURE TRANSFER switch and associated ACTIVE (red) and INHIBIT (yellow) indicators (part of Control Logic Board) l MTCE PHONE (maintenance telephone) jack (part of Control Logic Board) 0 BATTERY TEST pushbutton switch and as- sociated ON BATTERY POWER (red) and Eat- tery Test (green) indicators (part of MSM) 0 +5 V ADJUST potentiometer (part of Basic Power Supply Board) (a) Fuses. All -48 volt inputs and RAClRMW inputs to the LTU and Basic Shelves are fused as shown in Figure 2.10. Failure of a fuse to blow under fusing current conditions is very unlikely. To ensure proper protection, always replace a blown fuse with one of the correct value (refer to Figure 2.10). (b) Circuit Breakers. All system power supply mod- ules, including the Basic Power Supply Board in the PSU, are protected at their input by a cir- cuit breaker as shown in Figure 2.08. The remaining PSU controls and indicators are discussed below in text covering the individu- al PSU modules. 2. Basic Power Supply Board. The PSU Basic Pow- er Supply Board (refer to Figure 2.11) is a switch- ing power supply which provides +SVdc, -5Vdc, +12Vdc, and -12Vdc for operation of line/trunk unit and common equipment PCBs in the Basic Shelf, the FDDs, and the Control Logic Board and option- al MSM in the PSU. Failures in the Basic Power Supply Board could af- fect operation of the complete system or, selectively, certain types of line/trunk units or common equip- ment PCBs in the Basic Shelf, voltage and fuse alarm monitoring, SYNR+ and RAClRMW gener- ating, and failure transfer circuits on the Control Loaic Board. the MSM in the PSU. and the FDDs. Altrhough the PSU provides the dc voltages neces- sary to operate the floppy disk drive motors, cir- cuits in the CIOP control the voltages. The floppy disk drive select circuit in the CIOP switches dc to the motors of floppy disk drives FDDO and FDDl using the MOTORONO- and MOTORONI- signals, respectively. A failure in this circuitry could prevent switching of dc to a motor or cause dc to be switched to a.motor when it should be switched off. The inability to switch either motor on may be due either to a disconnected power cable between the PSU and the FDD (PSlJ.Jll and FDD J2) or a dis- connected control cable-between the Basic Shelf (J63 for FDDO; J62 for FDDl) and the FDD signal connector, Jl. In the event of a failure in the Basic Power Supply Board, the PSU should be replaced. 3. Ring Generator (RGEN) Module. The RGEN mod- ule in the PSU generates the ringing ac voltage (RAC) used in the SATURN IIE System. This voi- tage has a nominal 20H2, 90 volts RMS sinusoi- dal waveform. The RGEN module has a rated output power of 25 Watts and is powered from -48VP via fuse F5 (RGEN) on the PSU front panel. The output voltage (RAC) is routed to the Control Logic Board where it is interleaved with the Ring Message Waitinq signal (RMW) to form the RAClRMW signal, The RA&RMW signal is dis- tributed to the Basic and LTU Shelves via RAC fuses FlO through F13 on the PSU front panel. In the event of a failure in the Ring Generator Mod- ule, the PSU should be replaced. 4. Cbntrol Logic Board. The Control Logic Board con- tains circuits and components which perform the following functions. . 0 . Fuse Alarm Detection Ring Synchronization (SYNR+) Signal Generation Ringing AC/Ring Message Waiting (RACIRMW) Signal Generation Voltage and Alarm Monitoring Failure Transfer Control Failure Transfer and Alarm Output Relays Major and Minor Alarm Indicators Maintenance Telephone Jack (a) Fuse Alarm Detect Circuit. The fuse alarm de- tect circuit monitors each fuse and, upon sens- ing a blown fuse condition, sends a Fuse Alarm signal (FUSA+) to the Controller/Input-Output Processor (CIOP) PCB. A fuse alarm will cause a minor alarm condition in the SATURN IIE Sys- tem; however, the location of the blown fuse must be determined by a visual check of the fuses on the front panel of the PSU. These fuses are “grasshopper” type fuses in which a spring wire indicates by its position away from normal that the fuse has blown. (The spring wire also provides the alarm contact.) If used, a fuse alarm may also be provided through the external fuse alarm connections (EXT FUSE ALM, J15) on the rear panel of the PSU. Nor- mally closed external relay contacts are wired to the terminals and, when these contacts open, a fuse alarm (FUSA+) output will be sent to the CIOI? The EXT FUSE ALM terminals are jumpered at the factory to disable the function. 2-22
SATURN IIE EPABX Maintenance and Troubleshooting A failure in the fuse alarm detect circuit may cause spurious fuse alarm (FUSA+) signals or prevent a fuse alarm signal, depending on the nature of the fault. A spurious fuse alarm may occur due to a disconnected cable from J12 of the PSU module to the basic shelf as well as a fault in the CIOP PCB. If a fuse is blown but no fuse alarm is indicat- ed, the fault could be in the fuse alarm detect circuit in the PSU Control Logic Board or cir- cuits in the CIOP PCB. If the Fuse Alarm Detect Circuit on the Control Logic Board fails, replace the PSU. (b) Ring Synchronization Signal (SYNR+) Circuit. The SYNR+ signal is used in the SLMA-0, SLMA-S. and .%A16 PCBs to control the oper- ation and release of the ring relays. The SYNR+ sianal is routed from the PSU to the SMXTG PCB in the Basic Shelf. It is buffered in the SMXTG PCB and then distributed to each line/trunk group on the Basic and LTU shelves. Loss of the SYNR+ signal will gener- ate an alarm signal and light the ALMO LED on the affected LTUC PCB. Refer to Table 4.03. (c) Ringing AC/Ring Message Waiting (RACIRMW) Signal Circuit. The RAC signal from the PSU RGEN module and the ERING- signal from the CIOP PCB are used in the generation of the RAClRMW signal in the PSU Control Logic Board. The RAClRMW signal consists of 2-second in- tervals of RAC signal interleaved with l-second intervals of RMW signal. The transitions from RAC to RMW and from RMW to RAC are con- trolled by the ERING- signal. The RAC signal is nominally 90 Vat RMS 20Hz and the RMW signal is nominally 97 Vdc. The RAClRMVV signal consists of two interleaved phases as shown in Figure 2.12. During the RAC signal intervals, telephones in the ring mode will ring and the associated mes- sage waiting lamps will flicker. During the RMW signal intervals, telephones in the message waiting mode will have their message waiting lamps lighted steadily. The associated ringer will not sound. Thus telephones will ring with a 2 seconds on, 4 seconds off cadence and the message wait- ing lamps will light with a 1 second on, 2 se- conds off cadence. Failure of the RAClRMW circuit on the Control Logic Board may result in improper RAC or RMW signals and/or improper timing of these signals. Such faults may be detected audibty and visually. if the Ringing AC/Ring Message Waiting (RAC/RMW) Circuit on the Control Logic Board 03 A30808-X5130-DllO-l-6920 lssue 1, May 1986 fails, replace the PSU. Voltage and Alarm Monitoring Circuit. The vol- tage and alarm monitoring circuit is provided on the Control Logic Board in the PSU. The +12Vdc and and -5Vdc outputs of the PSU Bas- ic Power Supply Board and the -488 output vol- tage from the -48PS module(s) are monitored by the circuit. A loss of one or more of the three voltages causes a voltage failure signal (VFAIL+) to be sent to the SMXTG in the Bas- ic Shelf and results in a minor alarm. The +5Vdc, +5.2Vdc, and -12Vdc voltages are not monitored. The reason for this is that a loss, or low level, of the +5Vdc will affect operation of all line/trunk unit PCBs on the Basic Shelf and will cause generation of a PRESENCE ER- ROR alarm from all of these PCBs to be record- ed in the system’s failure history memory. The toss, or low level, of +52Vdc on the Basic Shelf will cause complete system failure. (However, if an MSM module is installed, the memory will be retained for at least 5 minutes.) The -12Vdc is used on the DTMF and RAUP modules. Therefore, a loss or low level of this voltage on the LTU or Basic Shelves, will be evidenced by misoperation of the RAUP PCB on the Basic Shelf and the DTMF PCBs on other shelves, as applicable. If the Voltage and Alarm Monitoring Circuit on the Control Logic Board fails, replace the PSU. (e) Failure Transfer Control Circuit. With the FAILURE TRANSFER mode select switch on the front of the PSU set to the AUTO position, an active MAJALM+ signal from the CIOP PCB in the Basic shelf will initiate a failure transfer. With the FAILURE TRANSFER mode select switch in the ACTIVE position, failure transfer is initiated regardless of the status of the moni- tored voltages and MAJALM+ signal. With the FAILURE TRANSFER mode select switch in the INHIBIT position, failure transfer is inhibited regardless of the status of the moni- tored voltages and MAJALM+ signal. If the Failure Transfer Control Circuit on the Control Logic Board fails, replace the PSU. (f) Failure Transfer and Alarm Output Relays. Failure transfer/major alarm and minor alarm relays in the PSU Control Logic Card have con- tact sets connected to pins on connector J13 on the rear panel of the PSU. Both relays are normally operated. Contact sets of one of the relays are used to control remote failure transfer (PXFER) and provide major alarm (MAJOR) status. A contact set on the other relay provides minor alarm (MINOR) status. I , -. 2-23
SATURN HE EPABX Maintenance and Troubleshooting RAC/RMW SIGNAL 90 VOLTS RMS, 20 HZ RAC 0 RAC 1 97 VOLTS DC RMW. TIME SCALE IN SECONDS Figure 2.12 RAClRMW Signals 2-24
SATURN IIE EPABX A30808-X5130-DllO-l-8920 Maintenance and Troubleshooting issue 1, May 1986 Both normally closed and normally open con- tact arrangements are provided for failure trans- fer and .for major alarm and minor alarm outputs to allow use of external equipment responding to either arrangement. Connections are normally made to the MDF for distribution of the failure transfer, major alarm, and minor alarm functions. The relay contacts connected to J13 will give an output status for the various combinations of MAJALM+ and MINALM+ signals as shown in Table 2.01. If a fault is suspected in the Failure Transfer and Alarm Output Relays on the Control Logic Board, replace the PSU. (g) Major and Minor Alarm Indicators. The MAJOR and MINOR ALARMS indicators are visible through openings in the PSU front panel and light when MA.JALM+ and MlNALM+ signals are received from the CIOP Table 2.02 shows alarm indicator states for combinations of MAJALM+ and MINALM+ signals from the CIOP If an alarm indicator is faulty, replace the PSU. (h) Maintenance Telephone (MTCE PHONE) Jack. A standard modular jack is accessible through the front of the PSU for plug-in of a maintenance telephone. The jack is connected to pins on con- nector J13 on the PSU rear panel as indicated in Table 2.01. Connector J13 is wired to the MDF If the jack or interconnecting printed circuit or PSU wiring is faulty, replace the PSU. Table 2.01 Pin Functions at Connector 513 on the PSU J13 PIN 1 Ring 26 Tip 2 Ring 27 Tip 3 Ring 28 Tip 31 Tip 4 Ring 29 Tip PIN LEAD AND RELAY CONTACT STATUS (Not Applicable) (Not Applicable) (Normally Open) (Common) (Normally Closed) (Common) (Normally Closed) (Common) (Normally Open) FUNCTION Maintenance Phone Failure Transfer Major Alarm 6 Tip (Normally Open) 5 Ring (Common) Minor Alarm 30 Tip (Normally Closed) Note: The relay contact status shown in this table applies when both relays are not operated (in accordance with standard convention). However, under normal system operating conditions, both relays are operated. Therefore, under normal system operating conditions, the relay contacts are the reverse of those shown in this table. Table 2.02 Alarm LEDs and Output Status at Connector J13 on the PSU ALARM STATUS LED LIT OUTPUT STATUS (J13) Neither MINALM+ nor None Normal MAJALM + Active MlNALM+ Only Active MAJALM+ Only Active Both MINALM+ and MAJALM-t Active MINOR only MAJOR only MAJOR only Minor Alarm Only Major Alarm, Failure Transfer Major Alarm, Failure Transfer 2-25