Corrected from:
- Servo Inverter 9400 HighLine V14.08.00
- Servo Inverter 9400 Servo PLC V08.08.00
Response of the new version:
The device-specific inverter characteristic loaded with the device command C2 = "70: Load Lenze inverter characteristic" has been adapted to the new power sections of E94B. The FW automatically identifies the hardware version E94A or E94B.
What happens?
The device-specific characteristic loaded with the device command C2=70 "Load Lenze inverter characteristic" is not compatible with the new power sections of the E94B.
This particularly shows during operation in the motor control type V/f at low speeds where the voltage error has the greatest effect. Smooth running is much poorer than than with identified inverter characteristics.
When does this behaviour occur?
The behaviour only occurs in connection with inverter hardware version E94B! Only in the sensorless motor control types, the voltage error is compensated according to the characteristic. In servo control operation, the function restriction has no effect.
An inappropriately compensated voltage error also shows effect during the motor data identification; the rotor resistance is not calculated correctly.
The behaviour also occurs when using an existing parameter set from an E94A for which the characteristic has been loaded with C2=70.
The characteristic loaded with the device command is not compatible with hardware version E94A.
Which products are affected?
- Servo Inverter 9400 HighLine of hardware version E94B with a firmware lower than V14.08.00
- Servo Inverter 9400 Servo PLC of hardware version E94B with a firmware lower than V08.08.00
Short-term measures:
Do not load the characteristic with C2=70, but identify it with C2=71 "Calculate inverter characteristic". In this way, the voltage error will be ideally compensated for.
Evaluation/recommendations:
In general, the behaviour does not occur with new applications because here, the inverter characteristic is usually calculated with C2=71.
When using existing parameter sets from devices in which the characteristic has been loaded with C2=70, the above-described behaviour can be considered as incompatibility:
After a device replacement from E94A to E94B, the VF motor control no longer works as before, smooth running is getting poorer. The behaviour cannot be removed by a firmware update. You additionally have to calculate the inverter characteristic (C2=71) or you can also load the device-specific characteristic (C2=70) with the corrected firmware.
