Hitachi WJ C1 Series User Manual

Chapter 9 Inverter Functions
9-5-18
Confirmation after encoder wiring and related parameter settings
 Once complete, check the encoder wiring and related parameter settings by referring to the
table below.
 Run the inverter in forward rotation and reverse rotation while checking the "Current position
monitor [d030]" to confirm that it is counting correctly. (When using the simple position control
function, set "Simple positioning selection [P012]" to "Simple positioning disabled (00)".)
 When the wiring and settings are correct, the [d030] display will add to the "Encoder constant
[P011]" with each forward rotation of the motor, and subtract from the "Encoder constant
[P011]" with each reverse rotation of the motor.
(When the phase order of the R, S, and T phases of the inverter and the U, V, and W phases of
the motor are wired correctly, and when the encoder output is a 90° phase shift pulse input,
phase A will be in the 90° advance phase during forward rotation.)
Event 
Probable cause 
Example of countermeasures
Forward and reverse rotation
are reversed.
Motor or encoder wiring is
reversed.
Check the motor wiring U, V, and W, and
the encoder phase A and B wiring. If
reversed, rewire correctly.
[d030] does not count.
Phase A/B pulse inputs from the
encoder are not output
correctly.
Check for abnormalities by measuring
the voltage waveforms of the phase A
and B wiring with a multimeter or similar
device.
If the voltage waveform is abnormal,
check the encoder power supply, wiring,
disconnections, etc.
Inverter settings are incorrect.
Refer to this section to set the inverter
parameters correctly.
The inverter's input circuit has
failed.
Repair the inverter.
[d030] does not count when
in forward rotation only, or
when in reverse rotation
only.
For phases A or B only, this is
caused by the same phenomena
as that described for "[d030]
does not count" above.
Check the encoder outputs for phase A
and B, and inverter inputs for phase A
and B referring to the above.
Pulse input cannot be counted
correctly due to crosstalk
between encoder A/B phase
signal outputs.
Use shielded cables for the A/B phase
wiring cables, and connect the shield to
the L terminal.
A

Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English