Installation
057-259 ISSUE: 1 Page 44 of 146
3.2.6 BUS/LOAD CURRENT TRANSFORMER
WARNING!: Do not disconnect this plug when the CT is carrying current. Disconnection
will open circuit the secondary of the C.T. and dangerous voltages may then develop. Always
ensure the CT is not carrying current and the CT is short circuit connected before making or
breaking connections to the module.
NOTE: Bus/Load CT is NOT REQUIRED in a system including only one mains supply (with
one DSE8x60 controller). See section below detailing advantages of the Bus/Load CT in a
multiple mains (multiple DSE8x60) system.
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 used and any other equipment sharing the CT. If in
doubt, consult your CT supplier.
NOTE: Take care to ensure correct polarity of the CT primary as shown below. If in doubt,
check with the CT supplier.
Pin
No
Description
CABLE
SIZE
NOTES
57 CT Secondary for Bus/Load CT
2.5mm²
AWG 13
Connect to s1 secondary of Bus/Load CT
58 CT Secondary for Bus/Load CT
2.5mm²
AWG 13
Connect to s2 secondary of Bus/Load CT
3.2.6.1 ADVANTAGES OF BUS/LOAD CT
The Bus/Load CT is only required when there is more than one DSE8x60 on the same system.
When the Bus/Load CT is fitted, the DSE8x60 transfers the right amount of load to the mains before
disconnecting the bus, preventing the generator(s) from being shock loaded/unloaded.
Without the Bus/Load CT, the DSE8x60 does not know how much load to transfer to the mains when
other DSE8x60’s are still in island mode. The DSE8x60 would transfer a pre-determined amount of
load before disconnecting the bus from the mains. This would lead to there being too much load or
not enough load transferred, and the generator(s) would be shock loaded/unloaded as the bus
disconnect from the mains.
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