7. DC INPUT CARD (PART NUMBER 05701-A-0325)
7.1 General
The dc power to the rack can enter the sub-rack via the DC Input Card.
This power may be supplied by the user from an external nominal 24V
dc supply. The dc supply is routed through the Engineering Card and
sub-rack back plane to all cards in the rack and is protected by a fuse on
the DC Input Card. There is a two part terminal block, TB1, to aid removal
of the card without disconnecting each of the connected wires.
To prevent excessive current ow along the rack backplane in
installations where more than eight 5704 Catalytic Cards are used, it is
recommended that the Control Cards are powered via their associated
Quad Relay Interface Card and the DC Input Card used to power the
Engineering Card only.
If required, a stand-by backup battery supply may also be connected
to the auxiliary dc input connections.
The PSU and AUX connections are isolated from each other by
diodes.
The DC Input Card also provides RFI ltering and reverse polarity
protection.
In addition, the DC Input Card provides an interface to the Engineering
Card plug-in modules via TB2. The functions of the six terminals will
varydependentuponthemoduletted.Forfulldetailsreferto:
a. 05701-M-5006 System 57 Control System
Modbus Interface Option RS485/422
b. 05701-M-5007 System 57 Control System
Event Printing Option RS232
c. 05701-M-5009 System 57 Control System
Alarm Update Option
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