Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual, Page: 63 / 252

INSTALLATION TESTING
Rotation Check
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INSTALLATION TESTING
Rotation Check
Start VFD in forward direction and check the motor rotation. If the motor is running backwards, disconnect
power to the VFD and reverse any two motor leads to change the motor rotation.
•
For submersible pumps or other applications that cannot be checked visually, rotation can be deter -
mined by evaluating performance. For example, if the system is not building the expected pressure, or
if the motor is running at less than 80% FLA or SFA at full speed, or if current does not go down as
expected, it may be running backwards.
• Performance comparisons can also be made using the Load Rotation settings available in the drive.
Refer to
“Forward or Reverse Selection” on page 67 .
IMPORTANT: Do not use the Load Rotation setting to correct a motor that is running backwards because of
incorrect wiring.
Feedback Checks
Check the motor run current on the VFD display while running at full speed. If it is higher than motor FLA (or
SFA), check motor wiring and for any mechanical problems (valves, dampers, etc.) that could create extra
load on the motor shaft.
When running in PID mode, check to see that transducer feedback (i.e. pressure) matches any gauges that
may be installed. If the target is not accurate, verify that the transducer scaling (Feedback Max) has been set
correctly.
Performance Checks
If PID is disabled, run the system and vary speed from VFD Low Frequency Limit to VFD High Frequency
Limit. Monitor output current, which should not exceed motor FLA or SFA. Check that equipment produces
the proper output (air flow, water flow, etc.) at nominal speed.
If PID is enabled, run the system with constant demand. Then change demand and monitor how system
pressure or temperature reaches the setpoint value. If the system responds very slowly, or very quickly with
overshooting, PID parameters P-Gain and I-Time should be adjusted.
If multiple acceleration/deceleration curves have been programmed, verify that motor performs as
expected.