Battery Charging Operation, Delayed Simulate Mains - Datakom D-500 MK2 User Manual

D-500 MK2 User Manual
34.6. BATTERY CHARGING OPERATION, DELAYED
SIMULATE MAINS
The Delayed Mains Simulation feature is used in battery backed up telecom systems where batteries are
able to supply the load during a certain period. The genset is requested to run only when battery voltage
drops below the critical level. Once the engine runs, the rectifier system starts charging the batteries and
the battery voltage goes up immediately. Thus the engine should continue to run a programmed period
for effective charging. The critical battery voltage level will be detected by an external unit which provides
the digital Disable Auto Start signal for the genset control unit.
The unit offers an optional Disable Auto Start signal input. Any digital input may be assigned as
Simulate Mains using Input Function Select program parameters.
It is also necessary to set the ACTION program parameter of the related input to 3 in order to prevent any
alarms generated from this input.
The Disable Auto Start signal may be a NO or NC contact, switching to either battery positive or battery
negative. These selections are made using the programming menu.
If the Delayed Simulate Mains program parameter is set to 1 and the input signal is active when the
genset is not feeding the load, the mains phases are not monitored and supposed to be inside limits. This
will prevent the genset from starting when the simulate mains signal is present (batteries charged). The
genset will start when mains voltages are out of limits and the simulate mains signal not present.
If the genset is running when the signal is applied, then MAINS SIMULATION will be prevented during
Flashing Relay On Timer program parameter. After this, usual Mains Waiting and Cooldown cycles will
be performed before engine stop. When the SIMULATE MAINS signal is present, the front panels mimic
diagram's mains LEDs will reflect the mains voltages as present.
When the signal is passive, the unit will revert to normal operation and monitor the mains voltage status.
The REMOTE START operation overrides Disable
Auto Start operation. When both "Remote Start
Operation" and "Delayed Simulate Mains" are
enabled then REMOTE START operation mode is
performed.
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Firmware V-6.3