GE UR Series C70, Instruction Manual

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GE Multilin C70 Capacitor Bank Protection and Control System 3-19
3 HARDWARE 3.2 WIRING
3
CONTACT INPUTS:
A dry contact has one side connected to terminal B3b. This is the positive 48 V DC voltage rail supplied by the power sup-
ply module. The other side of the dry contact is connected to the required contact input terminal. Each contact input group
has its own common (negative) terminal which must be connected to the DC negative terminal (B3a) of the power supply
module. When a dry contact closes, a current of 1 to 3 mA will flow through the associated circuit.
A wet contact has one side connected to the positive terminal of an external DC power supply. The other side of this contact
is connected to the required contact input terminal. If a wet contact is used, then the negative side of the external source
must be connected to the relay common (negative) terminal of each contact group. The maximum external source voltage
for this arrangement is 300 V DC.
The voltage threshold at which each group of four contact inputs will detect a closed contact input is programmable as
17 V DC for 24 V sources, 33 V DC for 48 V sources, 84 V DC for 110 to 125 V sources, and 166 V DC for 250 V sources.
Figure 3–19: DRY AND WET CONTACT INPUT CONNECTIONS
Wherever a tilde “~” symbol appears, substitute with the slot position of the module.
Contact outputs may be ordered as form-a or form-C. The form-A contacts may be connected for external circuit supervi-
sion. These contacts are provided with voltage and current monitoring circuits used to detect the loss of DC voltage in the
circuit, and the presence of DC current flowing through the contacts when the form-A contact closes. If enabled, the current
monitoring can be used as a seal-in signal to ensure that the form-A contact does not attempt to break the energized induc-
tive coil circuit and weld the output contacts.
There is no provision in the relay to detect a DC ground fault on 48 V DC control power external output. We
recommend using an external DC supply.
827741A4.CDR
CRITICAL
FAILURE
1b B
B
B
B
B
B
B
B
B
B
1a
2b
3a
-
3b +
-
5b HI+
6b LO+
6a
8a
8b
48 VDC
OUTPUT
CONTROL
POWER
SURGE
FILTER
POWER SUPPL
Y 1
24-250V
(Wet) (Dry)
7a
DIGITAL I/O 6B
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~ 7c
8a
8c
7b +
-
8b
+
+
+
CONTACT IN 7a
CONTACT IN 7c
CONTACT IN 8a
CONTACT IN 8c
COMMON 7b
SURGE
7a
DIGITAL I/O 6B
7c
8a
8c
7b
+
-
8b
+
+
+
CONTACT IN 7a
CONTACT IN 7c
CONTACT IN 8a
CONTACT IN 8c
COMMON 7b
SURGE
NOTE
NOTE