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Problems and Check Polnts
Problem
Motor does not start
Checkups
(1) Check the main circuit.
'
Is power applied? (Is the POWER lamp lit?)
*
Is motor connected correctly?
'
I s
the start signal present?
*
Are both start signals for forward and reverse rotation present?
*
Are terminals AU and SD closed when the frequency reference signal is in
*
(2) Check input signals.
Is the frequency reference signal zero?
the range from 4 to 20 mA?
Is the output shutoff (across terminals MRS and SD) or reset signal
(across terminals RES and SD) ON?
(3) Check parameter set values.
'
Is prevention of reversing rotation (Pr.
78)
set?
'
Is operation mode setting (Pr. 79) correct?
*
Is bias/gain setting (C-2 to C-5) correct?
'
Is starting frequency (Pr. 13) higher than the output frequency?
Is any frequency value set for each operation (such as 3-speed operation)
zero? Especially check
if
the maximum frequency is zero.
(4) Check load.
(5)
Others
*
Is load too heavy? Is the shaft physically locked?
'
Is an ALARM lamp lit?
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