Bender RCMA421H - 3 Function; Device Features; Description of Function

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RCMA421H_D00069_00_M_XXEN/05.2014
3. Function
3.1 Device features
 AC/DC sensitive residual current monitor with external 35 mm measur-
ing current transformer
 Can be used in conjunction with a contactor
 Rated residual operating current I
Δn
= 6 mA acc. to UL943
 Operating time acc. to UL943
 r.m.s. value measurement, frequency range 0…150 Hz
 Measured value display via multi-functional LCD
 Alarm signalling via LEDs (TPD, ERR) and K2 changeover contact
 Password protection to prevent unauthorised changes being made to
device settings
 Permanent fault memory
 N/C operation of alarm relay
 Device test when the power supply voltage is connected
 Automatic self test every 24 h
 CT connection monitoring
 Internal test circuit acc. to UL943 without additional external compo-
nents
 External test and reset button can be connected
 N-PE conductor monitoring on the load side
3.2 Description of function
The RCMA421H runs a device test when the power supply voltage is connect-
ed. During the start-up phase, the TRP LED lights up, the alarm LED ERR flashes
and the alarm relay switches to the alarm setting.
Once the device test has been completed successfully, the ERR alarm LED will
stop flashing, the TPD LED will go out and the alarm relay will return to the
normal setting.