Contact Inputs/Outputs - GE L60 Instruction Manual

3.2 WIRING
Every digital 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 may be used for the outputs of one relay. For example, for Form-C relay out-
puts, 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 digital 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 digital input/output module is ordered, four inputs per common is used. The four
inputs per common allows for high-density inputs in combination with outputs, with a compromise of four inputs sharing one
common. 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 may
3
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.
UR-SERIES FORM-A / SOLID STATE (SSR) OUTPUT CONTACTS:
Some Form-A/SSR 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 output 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 the
current is above about 1 to 2.5 mA, and the current monitor is set to "On = 1" when the current 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. The block diagrams of the circuits are below
above for the Form-A outputs with:
a) optional voltage monitor
b) optional current monitor
c) with no monitoring
a) Voltage with optional
current monitoring
V
b) Current with optional
voltage monitoring
c) No monitoring
3-10
~#a
I
If Idc 1mA, Cont Op x Von
~
~#b
otherwise Cont Op x Voff
V
~#c
Voltage monitoring only
~#a
If Idc 80mA, Cont Op x Ion
~
~#b
otherwise Cont Op x Ioff
I
~#c
Current monitoring only
~#a
~#b
~#c
Figure 3–12: FORM-A /SOLID STATE CONTACT FUNCTIONS
L60 Line Phase Comparison Relay

3.2.5 CONTACT INPUTS/OUTPUTS

I
-
Load V
+
Both voltage and current monitoring
V
-
I
Load
+
Both voltage and current monitoring
(external jumper a-b is required)
-
Load
+
3 HARDWARE
If Idc 80mA, Cont Op x Ion
~
otherwise Cont Op x Ioff
~#a
If Idc 1mA, Cont Op x Von
~
otherwise Cont Op x Voff
~#b
Load
~#c
If Idc 80mA, Cont Op x Ion
~
otherwise Cont Op x Ioff
~#a
If Idc 1mA, Cont Op x Von
~
otherwise Cont Op x Voff
~#b
Load
~#c
827821A5.CDR
GE Multilin
-
+
-
+