Installation
45
4.1.6 GENERATOR CURRENT TRANSFORMERS
WARNING!:- Do not disconnect this plug when the CTs are carrying current.
Disconnection will open circuit the secondary of the C.T.’s and dangerous voltages may then
develop. Always ensure the CTs are not carrying current and the CTs are short circuit
connected before making or breaking connections to the module.
NOTE:- The module has a burden of 0.5VA on the CT. Ensure the CT is rated for the
burden of the controller, the cable length being used and any other equipment sharing the
CT. If in doubt, consult your CT supplier.
PIN
No
DESCRIPTION CABLE
SIZE
NOTES
51 CT Secondary for Gen L1
2.5mm²
AWG 13
Connect to s1 secondary of L1 monitoring CT
52 CT Secondary for Gen L2
2.5mm²
AWG 13
Connect to s1 secondary of L2 monitoring CT
53 CT Secondary for Gen L3
2.5mm²
AWG 13
Connect to s1 secondary of L3 monitoring CT
Connection to terminals 54 & 55
The function of terminals 54 and 55 change position depending upon wiring topology as follows:
Topology Pin
No
Description CABLE
SIZE
No earth fault measuring
54 DO NOT CONNECT
55
Connect to s2 of the CTs connected to
L1,L2,L3,N
2.5mm²
AWG 13
Restricted earth fault measuring
54
Connect to s2 of the CTs connected to
L1,L2,L3,N
2.5mm²
AWG 13
55
Connect to s1 of the CT on the neutral
conductor
2.5mm²
AWG 13
Un-restricted earth fault measuring
(Earth fault CT is fitted in the neutral to
earth link)
54
Connect to s1 of the CT on the neutral to
earth conductor.
2.5mm²
AWG 13
55
Connect to s2 of the CT on the neutral to
earth link.
Also connect to the s2 of CTs connected to
L1, L2, L3.
2.5mm²
AWG 13
NOTE: - Terminal 58 is not fitted to the controller.
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