Operation
65
RCMS460-490_D00067_03_M_XXEN/12.2017
5. . Delay on release
t
(off)
If the condition that triggered the alarm does not exist anymore, the RCMS…
terminates its alarm once the release delay has elapsed.
Setting range: 0…999 s. Resolution of settings: the same as for response delay
t(on).
6. Cutoff frequency
Set the characteristics for the frequency response of residual current measu-
rement
I
Δ
n
and current measurement
I
.
The frequency response of the equipment can be set for a linear frequency re-
sponse (up to the maximum frequency of 2000 Hz) if used for fire protection
or for a frequency response in accordance with IEC 60990 for personnel pro-
tection. For plant protection, the residual current is measured up to the rated
system frequency. The figure below shows the corresponding frequency res-
ponse.
Param.
Objective
50 Hz
Plant protection: Only evaluates the fundamental compo-
nent of the current measurement.
60 Hz
Plant protection: Only evaluates the fundamental compo-
nent of the current measurement.
IEC
Personnel protection in accordance with IEC 60990 (touch
current for let-go): Above 200 Hz (approx.), the set response
value increases corresponding to the frequency-dependent
threshold according to IEC 60990.
None
Fire protection: Response factor remains the same over the
entire frequency range.