R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster NXT Service Manual - Manual (Page 18)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
18/53 R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
4.3.6 EMC
The frequency converter has an internal EMC filter in the power supply. By default, the EMC level of the frequency
converter is set to N by the manufacturer.
If the mains network is non-grounded (IT-network), the frequency converter’s EMC level shall be changed to 0 by
removing the filter capacitor disconnection screw.
Note: The filter capacitor disconnection screw cannot be replaced after it has been removed.
NOTICE
The frequency converter will be irreparably damaged if it is connected to an IT
network before the filter capacitor disconnection screw is removed.
When the EMC-screw is connected, the frequency converter has RC-filters connected to the power supply side to
reduce disturbances to the network. The capacitors of these filters may cause the RCD (Residual Current Device)
to trip. Therefore, the use of RCD with the frequency converter controlled cranes is not recommended.
Motor cable length
To fulfill the European EMC regulations, cable lengths shall not exceed following values:
Longer cable ≤ 40 m
Shorter cable ≤ 7 m.