Table 4
– Output Torque Foldback
Condition
Action taken by the Drive
1
Output Torque >= Foldback Limit of operating speed
range
Will reduce the speed at the rate of 60 rpm/s
2
Recovering Torque <= Output Torque < Foldback Limit
of operating speed range
Will remain in the current speed
3 Output Current < Recovering Current
Speed will be recovered to commanded speed
4
If the compressor load is not recovered and continue to
exceed the foldback limit in one of the conditions below:
•
After compressor running speed has reached to
Envelope min foldback speed and then stay at
Envelope min foldback speed for >= 30sec.
OR
•
If the original running speed was already <
Envelope min foldback speed for >= 30sec
Compressor will be tripped
Table 5
– IGBT Temperature Foldback
Condition
Action taken by the Drive
1 IGBTTemperature >= Foldback Temperature
Will reduce the speed at the rate of 180 rpm/s
2
Recovering Temperature <= IGBT Temperature <
Foldback Temperature
Will remain in the current speed
3 IGBT Temperature < Recovering Temperature
Speed will be recovered to commanded speed
4
If the compressor load is not recovered and continue to
exceed the foldback limit in one of the conditions below:
•
After compressor running speed has reached to
Envelope min foldback speed and then stay at
Envelope min foldback speed for >= 30sec.
OR
•
If the original running speed was already <
Envelope min foldback speed for >= 30sec
Compressor will be tripped
Table 6
– Inverter Temperature Foldback
Condition
Action taken by the Drive
1 Inverter Temperature >= Foldback Temperature
Will reduce the speed at the rate of 180 rpm/s
2
Recovering Temperature <= Inverter Temperature <
Foldback Temperature
Will remain in the current speed
3 Inverter Temperature < Recovering Temperature
Speed will be recovered to commanded speed
4
If the compressor load is not recovered and continue to
exceed the foldback limit in one of the conditions below:
•
After compressor running speed has reached to
Envelope min foldback speed and then stay at
Envelope min foldback speed for >= 30sec.
OR
•
If the original running speed was already <
Envelope min foldback speed for >= 30sec
Compressor will be tripped
