Wrong signal source polarity
Lenze · SHB4800/4900
What does SP mean?
This fault indicates that the polarity of an analog input signal (e.g., set-value, feedback) is inverted or incorrect, causing the drive to interpret the signal incorrectly. By default, this condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, as incorrect polarity can lead to unstable or dangerous operation. Manual reset is required.
Complete Troubleshooting Guide
- 1
Verify wiring polarity: Check the connections of the analog input signal (e.g., speed reference, actual value feedback) at the drive terminals for correct polarity (+/-).
- 2
Check sensor output: Confirm the sensor providing the signal has the correct output polarity.
- 3
Review drive parameters for polarity inversion: Check if there's a parameter in the drive that needs to be adjusted for analog input scaling or polarity.
- 4
Ensure signal source is correct: Verify that the signal source is compatible with the drive's input type (voltage/current).
- 5
Measure signal voltage/current: Use a multimeter to verify the actual signal value and its polarity at the input terminals.