How to Connect and Troubleshoot Transducer Feedback

This Technical Tip assists users in applying Yaskawa iQpump1000 and iQpump Micro products to pump systems and provides useful information on:

• running without a transducer
• fixing Fdb-L or Feedback Loss faults/alarms
• proper transducer wiring
• settings for voltage or current transducers
• multiple transducer wiring

What feedback transducers work with iQpump? Yaskawa’s iQpump1000 and iQpump Micro drives utilize transducer feedback to change pump speed to optimize system efficiency and performance. iQpump drives typically interface with either pressure, flow, and/or temperature transducers; most commonly pressure transducers with a 4-20 mA output. 4-20 mA pressure transducers have a maximum measurement range and the transducer will output 4 mA at zero pressure and proportionally increase to 20 mA at maximum pressure. Proper transducer wiring is key to running the iQpump in “Auto” regulating mode.