Johnson Controls York AYK550, User Manual

Page: 235 / 279

#8?8
YORK, A Johnson Controls Company
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AYK550 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.
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Motor cables require extra care in grounding and routing. The reasons have to do
with the following factors:
• Parasitic capacitance – Capacitors are, essentially, conductors that don’t touch,
but are in close proximity to each other. So, for example, there is a weak
capacitive connection between cables and any conductors they are near. Such
unintentional, but inevitable conductive paths are called parasitic capacitors.
Currents flowing through these paths often create problems. For example, current
leaks to control cables can create noise interference, leaks to the motor can
damage bearings, and leaks to the drive or other electronic cabinets can damage
components.
• Proximity – As the conductors get closer together, capacitance increases.
• Proximal area – As the area in close proximity increases, the capacitance
increases, e.g. close parallel paths increase parasitic capacitance between
conductors.
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2,7
F
0…
1
, 3-phase symmetrical, U
max
at the field weakening point
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0…500 Hz
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0.01 Hz
,
See "Ratings" on page 221.
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10…500 Hz
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Selectable: 1, 4, or 8 kHz
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90 °C (194 °F) rating minimum.
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R1 100 m 50 m
R2…R4 200 m 100 m
R5…R6 300 m 150 m
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