10 of 81
Motors
Q Can a 230V 3-phase motor be driven by a 400V drive?
A Yes, no problem. Just set the Max. Output Voltage Pr01-02=230V.
The output rms voltage is in this case 230V but the peaks are still 560V (from the DC-
bus). But 230V motors in general can handle this.If you use 400V drives, you should
select them based on the motor’s rated current.
Q How to preset speeds and master frequency via Modbus?
A When Frequency command by RS-485 and preset speeds are active, all drives will
accept a change of the master frequency via RS-485 without 04 error, except VFD-E.
Q Why do we measure voltage on PE?
A See diagram:
When PE is left open, both red capacitors (the so-called Y-capacitors) act as a voltage
divider.
The same happens because of capacitors in the built-in filter.
Therefore at PE you will find about half the mains voltage.When PE is connected
(which is very strongly recommended), you will have no problem.
Q Braking with brake resistor doesn’t work well. Why?
A When you use a brake resistor (brake chopper built-in or external brake unit) you have
to disable OV-stall prevention. It will interfere with the braking action, resulting in
longer deceleration rampes than expected.
Please refere to the different user manuals for the exact parameter.
To Next Page
Loading...