DKG-519 User Manual V-27
(14.04.2011)
- 17 -
6.8 Delayed Mains Simulation, Battery Charging
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
Simulate Mains signal for the genset control unit.
The unit offers an optional
SIMULATE MAINS
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 SIMULATE MAINS 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, then the genset will not run. This will prevent the genset from
starting when the simulate mains signal is present (batteries charged). The genset will start when the
simulate mains signal disappears.
If the genset is running when the signal is applied, then MAINS SIMULATION will be
prevented during
Flashing Relay 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 DELAYED SIMULATE MAINS
operation. When both parameters “Remote Start Operation” and
“Delayed Simulate Mains” are set then REMOTE START operation mode
is performed.