Installation
66
27891EN-900-02 / Edition 02/2017
9.4.4. CONNECTION VARIANT 3: CONNECTION VIA
THREE-POLES STANDARD PLUG (MIN. 15A)
If the unit is equipped with a three-pole standard connector (in Germany e.g.
CEE plug 16A acc. to DIN EN 60309), an RCCB type B 30mA acc. to DIN EN
61008 must be installed in the system to be connected.
All-current sensitive RCCBs (alternating current, pulsating direct current and
direct current) of type B react to all types of residual current. A typical
application is the protection of circuits containing frequency converters. In all
three roller mills with speed control (80S, 80E and all 120E models), frequency
converters are used to adjust the speed.
Note:
When switching off the unit, the intermediate circuit of the frequency
converter discharges and the RCCB can potentially be triggered by mistake!
Therefore we recommend to install a separate circuit with RCCB for this
machine in that connection variant.
WARNING
When using RCCBs of type A, which are not designed for all
types of residual currents, erroneous triggering can occur, or the
DC voltage generated by the frequency converter causes a bias
current making the RCCB lose its function!