OPERATION
Protection Features
77
If the run command is removed, or HOA is set to OFF, the Underload feature is canceled and the [Set–
45] timer is reset to its original setting.
Fine Tune Settings for ULD by Torque
1.
Verify accuracy of Motor FLA (SFA) [Set–03], Motor Voltage [Set–05], and VFD Base Freq [VFD–02].
These values determine nominal torque.
2. Adjust ULD Frequency [Set–43] to be equal to minimum operational frequency [Set–13] or [Set–22].
3. Run motor at minimum frequency and verify water movement for pump or air movement for fans.
4. While running the motor at minimum frequency, determine whether VFD trips on ULD:
•
If system trips on HLD using default ULD Level [Set–42], decrease level by 03% until system does
not trip.
•
If system does NOT trip using default ULD Level [Set–42], increase the level by increments of 3%
until system trips, then decrease back by 3%.
5. If nuisance tripping occurs, lower ULD Min Torque [Prot–57] by increments of 1%.
6. Adjust ULD Delay [Set–44] to duration acceptable for operation.
7. Adjust ULD Recovery Time [Set–45] to a duration that fills-up well enough to allow motor to run mini
-
mum time before another ULD trip.
Overpressure
The Overpressure feature stops the VFD when PID feedback exceeds a set value in either Hand or Auto.
To enable this feature, adjust the following parameters:
OverPress Set [SET–39]:
Disable, OP Trip, or OP Auto Reset.
•
When enabled, if PID Feedback exceeds OverPress Level [SET–40], the VFD trips on Overpressure fault.
•
If setting is OP Trip, manual or remote reset is required. If Reset Restart [VFD–36] is enabled and a run
command is present, the VFD will restart when reset.
•
If setting is OP Auto Reset, the VFD will restart when PID feedback falls below Wake-Up Level [SET–31]
and a run command is still present.
OverPress Level [SET–40]:
Overpressure trigger level in PID feedback units, 0.0 to SET-20 (Unit) PID F/B
Max.
Содержание Cerus X-Drive
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