Function
14
RCM420_D00057_03_M_ XXEN/03.2021
3. Function
3.1 Device features
AC and pulsed DC sensitive residual current monitor Type A according
to DIN EN 62020
Adjustable switching hysteresis
r.m.s. value measurement
Starting delay, response delay and delay on release
Measured value display via multi-functional LC display
Alarm indication via LEDs (AL1, AL2) and changeover contacts (K1, K2)
N/C operation or N/O operation selectable
Password protection against unauthorized parameter changing
Fault memory function can be switched off
CT connection monitoring
3.2 Function
Once the supply voltage U
s
is applied, the starting delay is activated. Measu-
red values changing during this time do not influence the switching state of
the alarm relays. Residual current measurement takes place via an external
measuring current transformer of the CTAC…, WR… or WS… series. The cur-
rently measured value is shown on the LC display. In this way any changes, for
example when circuits are connected to the system, can be recognized easily.
If the measured value exceeds one or both response values, the response de-
lays t
on1/2
start running. Once the response delay t
on1/2
has elapsed, the K1/
K2 alarm relays switch and the alarm LEDs AL1/AL2 light up. If the residual cur-
rent falls below the release value (response value minus hysteresis), the delay
on release t
off
begins. Once the release delay t
off
has elapsed, the alarm relays
return to their original state and the alarm LEDs AL1/AL2 go out. If the fault
memory is activated, the alarm relays remain in the alarm state and the LEDs
light until the reset button is pressed or until the supply voltage is interrupted.
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