282 ACQ550-U1 User’s Manual
Technical data
The most common temperature sensors are:
• motor sizes IEC180…225: thermal switch (e.g. Klixon)
• motor sizes IEC200…250 and larger: PTC or PT100.
Ground fault protection
ACQ550 internal fault logic detects ground faults in the drive, motor, or motor cable.
This fault logic:
• is NOT a personal safety or fire protection feature
• can be disabled using parameter 3017
EARTH FAULT
Note: Disabling earth fault (ground fault) may void the warranty.
• could be tripped by leakage currents (input power to ground) associated with long
high capacitance motor cables.
Grounding and routing
Motor cable shielding
Motor cables require shielding using conduit, armored cable or shielded cable.
• Conduit – When using conduit:
– Bridge joints with a ground conductor bonded to the conduit on each side of
the joint.
– Bond conduit run to the drive enclosure.
– Use a separate conduit run for motor cables (also separate input power and
control cables).
– Use a separate conduit run for each drive.
• Armored cable – When using armored cable:
– Use six-conductor (3 phases and 3 grounds), type MC continuous corrugated
aluminium armor cable with symmetrical grounds.
– Armored motor cable can share a cable tray with input power cables, but not
with control cables.
• Shielded cable – For shielded cable details, see section Motor cable
requirements for CE & C-Tick compliance on page 283.
Grounding
See section Ground connections on page 275.
For CE compliant installations and installations where EMC emissions must be
minimized, see section Effective motor cable shields on page 284.
Drive’s motor connection terminals
The drive’s motor and input power terminals have the same specifications. See
section Drive’s power connection terminals on page 276.
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