Relay functions
Function
Description
Alarm relay
NE
The relay is activated until the alarm that caused the activation is acknowledged and gone.
The alarm LED is flashing or constant, depending on the acknowledged state.
Limit relay
The relay will activate at the limit set point. No alarm will appear when both outputs
(OA/OB) of the alarm are adjusted to the limit relay. After the condition activating this relay
has returned to normal, the relay will deactivate when the “OFF delay” has expired. The
OFF delay is adjustable.
Horn relay
The output activates on all alarms. For a detailed description, refer to the chapter “Horn out-
put”.
Alarm/reset
The functionality is similar to “Alarm”, but with a short-time reset (menu 5002) if the relay is
ON and another alarm, set to the same relay, is activated.
Siren relay
The output activates on all alarms, like “Horn output”. If the relay is ON and another alarm is
active, a short-time reset (menu 5002) will be activated.
Alarm relay
ND
The relay is activated until the alarm that caused the activation is acknowledged and gone.
The alarm LED is flashing or constant, depending on the acknowledged state.
Common
alarm
The output activates on all alarms, just like the "Horn" function. If the relay is ON and anoth-
er alarm is active, a short-time reset will be activated. The common alarm output will be ac-
tivated as long as there is an active alarm, also if the alarm is acknowledged.
The controller has a self-check function and a status relay output that responds to this function. The status
relay is prepared for 24 V DC/1 A, and it is normally energised.
The self-check is monitoring the programme execution. Should this fail, that is in the unlikely event of micro-
processor failure, then the self-check function deactivates the status relay.
Use the output from the status relay to perform a proper action for the genset application. Typically, this would
mean a shutdown of the genset since it is now operating without protection and control.
The protections in the controller are not functioning when the self-check function deactivates
the status relay.
There are two “Self-check ok” LEDs on the controller. One is placed on the display and one on
the main unit. The LEDs are lit when the unit is fully operational.
4.18.1 Limit relay
For all alarm functions, it is possible to activate one or two output relays as shown below. This paragraph ex-
plains how to use an alarm function to activate an output without any indication of alarm. ON and OFF delay
timers are described as well.
If no alarm is needed, it is possible to do one of the following things:
1. Set both output A and output B to Limit.
2. Set both output A and output B to the same specific terminal. If terminal alarm is not required, the set
point in the specific relay is set to Limit relay.
GPC-3 DRH 4189340587 UK
Additional functions
DEIF A/S
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