2.7
Time delays
t
and
t
on
The times
t
and
t
on
described below delay the signalling of prewarning and main alarm via LEDs
and the output relays.
2.7.1 Start-up delay t
After the supply voltage
U
s
has been switched on, the device is in alarm state, which means that
the output relays K1 and K2 are open and the installation is switched off. This parameter cannot
be adjusted.
2.7.2 Response delay
t
on1/2
When exceeding a response value
I
Δn1/2
, the MRCDB423 requires the response time
t
an
to output
the alarm. A set response delay
t
on1/2
(0…10 s) is added to the device-specific operating time
t
ae
and delays signalling.
(Total delay time
t
an
=
t
ae
+
t
on
).
If the fault does not persist during the response delay, the alarm is not signalled.
i
If I
Δn2
is set to 30 mA (personal protection), the response delay t
on2
of K2 is automatically
and invariably set to 0 s.
2.8
External, combined test or reset button T/R
Reset = pressing the external button briefly (< 1 s)
Test = pressing and holding the external button (> 2 s)
The device function can be tested using the test button "T".
2.9
Device parameter settings
The device parameters are set via the control buttons on the front. The device parameter settings
are password-protected.
8 MRCDB423_D00396_01_M_XXEN/06.2021
Function
