GE Multilin L60, Instruction Manual

Page: 69 / 752

GE Multilin L60 Line Phase Comparison System 3-11
3 HARDWARE 3.2 WIRING
3
Substitute the tilde “~” symbol with the slot position of the module in the following figure.
Figure 3–12: CT/VT MODULE WIRING
3.2.5 CONTACT INPUTS AND OUTPUTS
Every contact input/output module has 24 terminal connections. They are arranged as three terminals per row, with eight
rows in total. A given row of three terminals can be used for the outputs of one relay. For example, for form-C relay outputs,
the terminals connect to the normally open (NO), normally closed (NC), and common contacts of the relay. For a form-A
output, there are options of using current or voltage detection for feature supervision, depending on the module ordered.
The terminal configuration for contact inputs is different for the two applications.
The contact inputs are grouped with a common return. The L60 has two versions of grouping: four inputs per common
return and two inputs per common return. When a contact input/output module is ordered, four inputs per common is used.
If the inputs must be isolated per row, then two inputs per common return should be selected (4D module).
The tables and diagrams on the following pages illustrate the module types (6A, etc.) and contact arrangements that can be
ordered for the relay. Since an entire row is used for a single contact output, the name is assigned using the module slot
position and row number. However, since there are two contact inputs per row, these names are assigned by module slot
position, row number, and column position.
Some form-A / solid-state relay outputs include circuits to monitor the DC voltage across the output contact when it is open,
and the DC current through the output contact when it is closed. Each of the monitors contains a level detector whose out-
put is set to logic “On = 1” when the current in the circuit is above the threshold setting. The voltage monitor is set to “On =
1” when there is a voltage across open contact (the detector allows a current of about 1 to 2.5 mA), and the current monitor
is set to “On = 1” when the current flowing through the closed contact exceeds about 80 to 100 mA. The voltage monitor is
intended to check the health of the overall trip circuit, and the current monitor can be used to seal-in the output contact until
an external contact has interrupted current flow. 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 inductive coil circuit and weld the output contacts.
Block diagrams are shown as follows for form-A and solid-state relay outputs with optional voltage monitor, optional current
monitor, and with no monitoring. The actual values shown for contact output 1 are the same for all contact outputs. Form-A
contact output with or without a current or voltage monitoring option is not polarity sensitive. The polarity shown in the figure
is required for solid-state contact output connection.
NOTE
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
1a 1b 1c 2a 2b 2c 3a 4a 5a 6a 7a 8a 3b 4b 5c 6c 7c 8c 3c 4c
Current inputs
8F module (4 CTs and 4 VTs)
Voltage inputs
VA VB VC VX
VA VB VC VX
IA IC IB
IG
IA5 IC5 IB5
IG5
IA1 IC1 IB1 IG1
5a 5b 5c 6a 6b 6c 7a 8a 7b 8b 7c 8c
Current inputs L60 communications interface inputs/outputs
Transmit
channel 1
Transmit
channel 2
Receive
channel 1
Receive
channel 2
8P module (4 CTs and L60 communications interface)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
1a 1b 1c 2a 2b 2c 3a 4a 3b 4b 3c 4c
IA
Tx1N Tx2N
BA
T
T
+
BA
T
T
+
Tx1P Tx2P
Rx1N Rx2N
BA
T
T
-
BA
T
T
-
Rx1P Rx2P
IC IB IG
IA5 IC5 IB5 IG5 IA1 IC1 IB1 IG1
842767A1.CDR