E5
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H High Performance Universal Inverter User Manual
Appendix C FAQ
131
on the operation panel (or the FWD/REV knob of the shuttle operation panel) can real time change the
direction, that is, it is possible to decelerate upon 0 speed from forward direction and then accelerate in
reverse direction using DN key and vice versa to decelerate upon 0 speed from reverse direction and then
accelerate in forward direction using UP key.
A: (3) In the case of operation panel control, the positive/negative frequency value resulting from the final
frequency calculation for composite control can also change the direction in real time.
A: (4) In the case of terminal control, check if the forward/reverse terminal is in one to one correspondence
with that of the control equipment (e.g. PLC).
XIII. Why did the fans of inverters of certain power classes will rotate upon power up, while others
could not?
A: The fans of the 15kW inverters and inverters of lower power class are under no control, and they will run
when powered up. The operation of the fans of 18.5kW inverters and inverters of higher power class is
controlled by the heatsink temperature. When the inverter is powered up under low temperature condition,
the fans will not run.
XIV. What will happen if the CN1 busbar of the control board is loose or damaged?
A: If the CN1 busbar of the control board is loose or damaged, the inverter cannot run or will report several
errors. For instance, the inverter may display “
−
LU
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” or “relay/contactor could not pull on “, or report such
errors as E.oc1, E.FAL, E.oH1, E.oH2 and E.Cur ect.
