PACMotion™ PSD
Installation and User Manual
Section 4
GFK-3168A
September 2020
Technical Description and Data
44
4.17.2
Residual current protective device (RCD)
In conformity with IEC 60364-4-41
–
Regulations for installation and IEC 60204
–
Electrical
equipment of machinery, residual current protective devices (RCDs) can be used provided the
requisite regulations are complied with. The PSD is a 3-phase system with a B6 bridge. Therefore,
RCDs which are sensitive to all currents must be used in order to detect any DC fault current. Refer
to the chapter above for the rule of thumb for determining the leakage cur- rent. Rated residual
currents in the RCDs:
10 to 30 mA
Protection against "indirect contact" (personal fire protection) for
stationary and mobile equipment, as well as for "direct contact".
50 to 300 mA
Protection against "indirect contact" (personal fire protection) for
stationary equipment
Note:
Recommendation: In order to protect against direct contact (with motor cables shorter than
5 m) Emerson recommends that each drive be protected individually using a 30 mA RCD which is
sensitive to all currents.
If you use a selective RCD, the more intelligent evaluation process will prevent spurious trip- ping of
the RCD.
4.17.3
Isolating transformers
When protection against indirect contact is absolutely essential despite a higher leakage cur- rent,
or when an alternative form of shock-hazard protection is sought, the PSD can also be operated via
an isolating transformer (schematic connection (
# 102). A ground-leakage monitor can be used
to monitor for short circuits.
Keep the length of wiring between the transformer and the drive as short as possible.
