9
TGH1442en/06.2012
3. Function
3.1 Device features
AC/DC sensitive residual current monitor Type B according to IEC
62020 and IEC 60755
Two separately adjustable response ranges (prewarning, alarm)
Adjustable switching hysteresis
r.m.s. value measurement
Start-up 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 unauthorised parameter changing
Fault memory function can be switched off
CT connection monitoring
3.2 Function
Once the supply voltage Us is applied, the start-up delay is activated. Meas-
ured values changing during this time do not influence the switching state of
the alarm relays. Residual current measurement takes place via external
W20AB…W210AB series measuring current transformers. The currently meas-
ured value is shown on the LC display. In this way any changes, for example
when circuits are connected to the system, can be recognised easily. When
the measured values exceed the response values , the response delays t
on1/2
begin.
Once the response delay" ton1/
2"
has elapsed, the "K1/K2" alarm relays switch
and the alarm LEDs "AL1/AL2" light upIf the residual current falls below the re-
lease value (response value minus hysteresis), the delay on release toff begins.
Once toff has elapsed, the alarm relays return to their initial position and the
alarm LEDs AL1/AL2 go out. If the fault memory is activated, the alarm relays
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