2.9.5.5
Fault Protection
Provide controller fault protection so that a single or three phase short
circuit at the controller terminals or inverter commutation failure will
not result in damage to power circuit components. Provide overload
protection so that motor and controller are protected against operating
2.9.5.6
Time Delay
Provide adjustable time delay under voltage protection so that motors will
continue to operate during momentary voltage fluctuation or loss of
voltage. Time adjustment shall be zero to 5 seconds. Provide for orderly
shutdown on undervoltage conditions exceeding the time delay interval.
2.9.5.7
Acceleration/Deceleration
Provide adjustable timed linear acceleration and deceleration.
2.9.5.8
Voltage/Frequency Control
Provide volts/Hz control to prevent motor overheating throughout the speed
range.
2.9.5.9
Door Interlocks
Provide door interlocks to prevent opening of enclosure doors unless power
is disconnected.
2.9.5.10
Shutdown Conditions
Controllers shall be self protecting and shall provide orderly shutdown
for, but not limited to, the following conditions:
a.
Loss of input power
b.
Undervoltage
c.
Sustained gradual overload
d.
Fault or large instantaneous overload
e.
Overtemperature
f.
Failure of ventilating system
g.
Overvoltage
h.
Control circuit failure
Provide contacts for remote annunciation of shutdown or abnormal condition.
2.9.5.11
Electrical Bypass
Provide each controller with manual isolation and bypass switching. Switch
shall be manually operated with controller deenergized. Switch shall be
two position with provisions for locking the switch in either position.
a.
Normal Position:
Bypass shall be open and connect controller to
SECTION 15511N
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