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b) if mains is closed, controller will soft transfer load to mains; when load transfer is over, bus open
relay outputs;
2)
Controller issues stop command and enters standby mode.
3)
If gensets are in auto mode, they will enter auto stop process, for which please refer to controller
user manual.
4.6 SWITCH CONTROL PROCEDURES
4.6.1
MANUAL CONTROL PROCEDURES
When controller is in manual mode, switch control process is conducted manually. Breaker close/open is
controlled by close/open key.
Bus Close Operation：In normal running process, press
when mains is not closed, bus close relay outputs;
when mains is already closed, controller will regulate genset speed and voltage on the bus automatically
to synchronize genset with mains. When synchronization conditions are satisfied, bus close relay
outputs and parallel genset with mains. controller will control soft load transfer, and after the transfer it
will do load share normally.
Bus Open Operation: Press
when mains is not closed, bus open relay outputs directly;
when mains is closed already, controller firstly soft transfers load to mains, and after transfer bus open
relay outputs .
Mains Close Operation: When mains is normal, press mains close key
when bus is not closed, mains close relay outputs;
when bus is closed already, controller shall regulate genset speed and voltage on the bus automatically
to make bus synchronizing with mains. When conditions are met, mains close relay outputs, and parallel
mains with bus. Controller controls soft load transfer, and after the transfer, it will do normal load share.
Mains Open Operation: Press mains open key
when bus is not closed, mains open relay outputs directly;
when bus is closed already, controller first will soft transfer load to bus, and after load transfer then
mains open relay outputs.
4.6.2
AUTOMATIC CONTROL PROCEDURE
When controller is in auto mode, the switch control procedure is automatic control procedure.
NOTE：Auxiliary input of breaker close must be configured for input port, and wiring must be connected correctly.
HGM8156 Genset Parallel (With Mains) Controller
HGM8156 GENSET PARALLEL CONTROLLER USER MANUAL
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2019-09-10
Version 1.1
Page 14 of 44
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