MRCDB300 series
MRCDB300-series_D00343_05_Q_XXEN/01.2022
5
LED flashing modes
slowly
error
medium
mode change
quickly
ready for address modification
slow flashing
address setting mode
once
confirmation
System state LED and output relays
The LED indicates the system state by means of colours and lighting/flashing. The changeover
contacts of the relay outputs K1 and K2 have defined switching positions for each system state.
System state
GREEN
LED
ON
RED
LED
Alarm
Notes
Relay K1
Relay K2
Device switched off
off
off
Device is de-energised, no monitoring, no moni-
toring function.
de-energised de-energised
Normal operating state
lights
off
The device is supplied with the specified voltage
and monitors the primary circuit. No residual
current flows which would lead to tripping.
energised
energised
Prewarning
lights
flashes
briefly
The device is supplied with the specified
voltage and monitors the primary circuit. A fault
current flows which exceeds the set limit of the
prewarning.
de-energised energised
Alarm state
off
lights
The device is supplied with the specified voltage
and monitors the primary circuit. A fault current
flows which exceeds the set limit of the alarm.
de-energised de-energised
Device error
off
flashes
slowly
The device is supplied with the specified voltage
and monitors the primary circuit. An error is
detected by the periodic self tests.
de-energised de-energised
Device in calibration mode
see manual for DC calibration procedure
de-energised de-energised
Device in address mode
see manual for procedure
Device signalling
flash quickly in
alternation
Modbus register 20006 = 2
Use to detect the device in its environment faster.
Is automatically deactivated after one minute.
Reset
off
flashes
slowly
State is reached by pressing and holding the "T"
button during alarm state. To perform the reset,
release the "T" button when the red LED flashes
slowly (1,5…5 s).
Test
flashes
quickly
off
State is reached by pressing and holding the "T"
button in normal operating state. To perform the
test, release the "T" button when the green LED
flashes quickly (5…10 s).
switches
switches
A
B
C
D
E
