GE t60 Instruction Manual page 51

3 HARDWARE
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. In addition, the negative side of the external source must be connected
to the relay common (negative) terminal of each contact input 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.
(Dry)
Figure 3–15: DRY AND WET CONTACT INPUT CONNECTIONS
Wherever a tilde "~" symbol appears, substitute with the Slot Position of the module.
NOTE
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 cur-
rent monitoring can be used as a seal-in signal to ensure that the Form-A contact does not attempt to break the energized
inductive 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.
NOTE
GE Multilin
DIGITAL I/O 6B
~ 7a + CONTACT IN ~ 7a
~ 7c + CONTACT IN ~ 7c
~ 8a + CONTACT IN ~ 8a
+ 24-250V
~ 8c ~
CONTACT IN 8c
-
~ 7b ~
COMMON 7b
~ 8b SURGE
B 1b
CRITICAL
B 1a
FAILURE
B 2b
B 3a -
48 VDC
B 3b + OUTPUT
B 5b HI+
CONTROL
B 6b LO+
POWER
B 6a -
B 8a SURGE
B 8b FILTER
T60 Transformer Management Relay
(Wet)
DIGITAL I/O 6B
~ 7a + CONTACT IN ~ 7a
~ 7c + CONTACT IN ~ 7c
~ 8a + CONTACT IN ~ 8a
+
~ 8c ~
CONTACT IN 8c
-
~ 7b ~
COMMON 7b
~ 8b SURGE
827741A4.CDR
3.2 WIRING
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