232 ACH550-UH User’s Manual
Technical Data
Motor Connections
Warning! Never connect line power to the drive output terminals: U2, V2 or W2.
Line voltage applied to the output can result in permanent damage to the unit.
If frequent bypassing is required, use mechanically interlocked switches or
contactors.
Warning! Do not connect any motor with a nominal voltage less than one half
of the drive’s nominal input voltage.
Warning! Disconnect the drive before conducting any voltage tolerance (Hi-
Pot) test or insulation resistance (Megger) test on the motor or motor cables.
Do not conduct these tests on the drive.
Motor Connection Specifications
Ground Fault Protection
ACH550 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 set to trigger only a warning using parameter 3017 EARTH FAULT.
• Could be tripped by leakage currents (input power to ground) associated with the
use of an optional RFI/EMC filter.
Motor Connection Specifications
Voltage (U
2
) 0…U
1
, 3-phase symmetrical, U
max
at the field weakening point
Frequency 0…500 Hz
Frequency Resolution 0.01 Hz
Current See "Ratings" on page 225.
Field Weakening Point 10…500 Hz
Switching Frequency Selectable: 1, 4, or 8 kHz
Cable Temperature Rating 90 °C (194 °F) rating minimum.
Maximum Motor Cable
Length
Frame Size
Max. Motor Cable Length*
f
sw
= 1 or 4 kHz f
sw
= 8 kHz
R1 100 m 50 m
R2…R4 200 m 100 m
R5…R6 300 m 150 m
* Warning! Using a motor cable longer than specified in the
chart above may cause permanent damage to the drive.
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