2.4.2 Alarm relay K1
The relay K1 is deactivated if a fault is detected in the system (Chapt. 3.3).
This has a relay. The following table shows the configuration of the corresponding
Alarm relay K1
Faults occurring in the Power Controller and the load circuit are signalled. Signalling
ensues via LED (LOAD FAULT) and via the K1 relay.
2.5.1 Monitoring of load and mains voltage
The limiting values of the voltage are -57% of the type voltage for undervoltage
monitoring and +10% of the type voltage for overvoltage monitoring. This produces
the following absolute limiting values:
When operating below the type voltage (-15%), the devices may only be
operated down to the undervoltage limit if the electronics are supplied
by an ext. 24V voltage. If the undervoltage limit is undercut, the pulse
lock is activated internally and relay K1 is released.
2.5.2 Absolute value monitoring current
This function allows monitoring of a freely selectable absolute current limit. The
value is set by potentiometer R205. During the setting procedure an instrument
connected to the analog output indicates the monitoring value. (Chapt 3.2) This
absolute value monitoring lends itself to one or more load resistances arranged in
parallel. Generally, the effective current value measured is continuously compared
with a presettable absolute current limit for undercurrent. If this limit is undercut, an
indication shows. In the case of resistance elements arranged in parallel, it is possi-
ble to select a partial load interruption by setting the undercurrent limit accordingly.
2.5.3 Equipment temperature monitoring
The control board is equipped with a temperature monitor.