Figure 2
– Shutdown Sequence
2
D
RIVE
F
OLDBACK
I
NFORMATION
Table 3
– Input Current Foldback
Condition
Action taken by the Drive
1 Input Current >= Foldback Current
Will reduce the speed at the rate of 120 rpm/s
2
Recovering Current <= Input Current < Foldback
Current
Will remain in the current speed
3 Input 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
Envelope min foldback speed for >= 30sec.
OR
•
If the original running speed was already <
Envelope min foldback speed for >= 30sec
Compressor will be tripped
Stop
Shutdown Initiated
60-360RPM/S (Reg.210)
900RPM (Minimum Speed)
Shutdown Down rate is
Customer configured
