ES700 Series Elevator-specific Frequency Inverter and Converter

A: It's most likely that the acceleration/deceleration time or S-curve characteristic parameters are not properly adjusted, leading to poor matching with the elevator load. It could also be due to improper setting of feedforward control parameters, causing delayed speed response. You can first readjust the acceleration/deceleration curve according to the elevator's common load range, then calibrate the feedforward control gain.

A: First, check if the motor wiring is loose or oxidized, especially if the contacts of the star-connection contactor are ablated (focus on PM motor models). Then confirm if the motor insulation is aging or if the load is overweight (e.g., the elevator runs at full load for a long time). If both are normal, the inverter's internal current detection module may be faulty and require inspection and repair.

A: The brake of an old elevator may be severely worn, leading to delayed brake feedback signals and the inverter misjudging it as "slipping." You can first adjust the sensitivity threshold of the anti-slip-down function and extend the signal detection time. At the same time, check the brake wear and replace the brake pads or adjust the brake clearance if necessary.

A: No, it's not normal. It's most likely that the motor self-learning was not properly performed, and the inverter failed to accurately match the PM motor parameters (such as magnetic pole position and stator resistance). It could also be that the torque compensation parameter is set too high. You can re-run the elevator-specific self-learning (even with steel cables attached) and then reduce the torque compensation gain to optimize operation smoothness.

A: First, confirm if the UPS voltage is within the compatible range (200V class: 48VDC~340VDC; 400V class: 48VDC~680VDC). Low voltage will trigger protection. Then check if the UPS capacity is sufficient, especially when the elevator load is large--small-capacity UPS may not be able to drive it. In addition, if the control power supply is not separated from the main circuit power supply (without the optional part), it may also cause unstable power supply and trigger shutdown.

A: First, clean the dust on the inverter's cooling fan and heat sink (elevator machine rooms usually have a lot of dust, which can easily block them) and check if the fan speed has decreased or if it has stopped. Then confirm if the machine room ventilation is good and if the ambient temperature exceeds the inverter's operating range. If it's a heavy-load condition, the 50% ED rated load may not be properly matched, and long-term overload operation can cause overheating. You need to adjust the operating load or replace it with a larger capacity model.

A: The encoder itself may be aging (e.g., the battery of the absolute encoder is dead) or the connection between the encoder and the motor shaft is loose. It could also be a fault in the inverter's encoder signal interface module. You can first replace the encoder battery (if replaceable) and re-fix the connecting shaft. If the error still occurs, use a multimeter to detect the voltage and waveform of the signal interface to determine if it's an internal inverter fault.

A: First, confirm if the protocol has been activated (some models require separate activation for the protocol, which is not enabled by default). Then check if the shield layer of the communication cable is properly grounded to avoid electromagnetic interference (wiring in elevator machine rooms is complex and prone to interference). In addition, the protocol version of the main control board must match the inverter--for example, models with under-development DCP3/DCP4 protocols cannot be connected to old-version main control boards.