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ALARM RELAYS
There are eight alarm relays that provide normally open or normally closed
contacts for each of the following alarms:
■ Visual Critical
■ Visual Major
■ Visual Minor
■ Audible Critical
■ Audible Major
■ Audible Minor
■ Auxiliary 1
■ Auxiliary 2
POWER SUPPLY 48 PIN CONNECTOR PINOUT
TOTAL ACCESS 4303 PLUS DC POWER SUPPLY
DC SUPPLY
CLEI: SLPOCDBC_ _
61202335L1-22A
0401
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
FRONT PANEL LEDs
POWER ●●Off Both –48 VDC fuses blown, power not supplied to the shelf,
or incorrect polarity on the voltage supplied to the shelf
●Green Power supplied is the correct voltage and polarity; backplane
and hot insertion voltages correct
●Amber –48 VDC input and hot insertion voltage present; no back-
plane voltage
●Red –48 VDC input present; no backplane voltage and no hot
insertion voltage
TEMP ●●Off Normal
●Red Over-temperature condition
DESCRIPTION
The Total Access
®
4303 Plus DC Power Supply is a removable assembly that provides
the voltages necessary for proper system operation. The unit features LEDs for over-
temperature and DC output, an input fuse, and the ability to be hot-swapped when
used with another DC supply in the same chassis. The supply interfaces to the Total
Access backplane through a 48-pin connector. The unit accepts one or two –48 VDC
inputs from the backplane and supplies –48 VDC fused output for use with external
input logic, +5 VDC as hot insertion bias voltage for modules, and +2.1 VDC for back-
plane termination. In addition, the Total Access 4303 Plus DC Supply provides alarm
relay ouputs when installed in slot PS-A.
The following features are supported on the Total Access 4303 Plus DC Power Supply:
■ Thermal limit indicator with open collector output
■ DC status indicator on the 2.1 and 5 volt outputs with open collector output
■ Short circuit protection
■ Compatible with existing Total Access DC Power Supplies (P/N 1200335L1)
SPECIFICATIONS
Specifications
Input Voltage –42 VDC to –56 VDC
Operating Temperature –40°C to +65°C
Storage Temperature –40°C to +85°C
Relative Humidity Up to 95% noncondensing
Over Temperature Indication 90°C ±5%
–48 VDC Short Circuit Protection Fused 1-amp slow blow
Backplane Voltage Short Circuit Protection Self-mending
Compliance FCC Part 15, UL 60950, NEBS Level III,
GR-1089-CORE
Pin # Row A Signal Row B Signal Row C Signal
1 AUD_CRIT_NO AUD_CRIT_COM AUD_CRIT_NC
2 AUD_MAJ_NO AUD_MAJ_COM AUD_MAJ_NC
3 AUD_MIN_NO AUD_MIN_COM AUD_MIN_NC
4 VIS_CRIT_NO VIS_CRIT_COM VIS_CRIT_NC
5 VIS_MAJ_NO VIS_MAJ_COM VIS_MAJ_NC
6 VIS_MIN_NO VIS_MIN_COM VIS_MIN_NC
7 AUX1_RLY_NO AUX1_RLY_COM AUX1_RLY_NC
8 AUX2_RLY_NO AUX2_RLY_COM AUX2_RLY_NC
9 –48V_A PS_OK PS_TEMP
10 –48V_B 2.1V PS_PRESENT
11 2.1V 2.1V 2.1V
12 –48V_AB_RTN 2.1V VCC
13 GND GND GND
14 GND GND PSRLY_CLK
15 GND PSRLY_LOAD PSRLY_DATAIN
16 FR_GND –48V PSRLY_DATAOUT
JOBAID
#61202335L1-22A#