Safety instructions
14
RCMA420-DM_D00060_02_M_XXEN/06.2016
2.3
Intended use
The AC/DC sensitive residual current monitor RCMA420-DM is designed for
use in earthed systems (TN and TT systems) where DC and AC fault currents
may occur. These are in particular loads containing six-pulse rectifiers or one
way rectifiers with smoothing, such as converters, battery chargers, construc-
tion site equipment with frequency-controlled drives.
Two separately adjustable response ranges allow to distinguish between
prewarning (
I
Δn1
= 50…100 % of the set response value
I
Δn2
) and alarm (
I
Δn2
).
Since the values are measured with measuring current transformers, the
RCMA is nearly independent of the nominal voltage and the load current of
the system being monitored.
In order to meet the requirements of the applicable standards, customised pa-
rameter settings must be made on the equipment in order to adapt it to local
equipment and operating conditions. Please heed the limits of the range of
application indicated in the technical data.
Any use other than that described in this manual is regarded as improper.
