signal may be less affected by the electromagnetic noise signal by adjusting PAR_13 (Encoder LPF Time
Constant).
Code
LCD display
Description
Setting range
Factory setting
PAR_11
Enc Dir Set
Encoder direction setting
A Phase Lead/B Phase Lead
A Phase Lead
Setting
Description
Encoder pulse (In FWD RUN)
A Phase Lead
A phase leads in FWD rotation.
B phase leads in REV rotation.
B Phase Lead
A
B
B phase leads in FWD rotation.
A phase leads in REV rotation.
A
B
Improper setting of encoder parameters may deteriorate accurate speed control and lead to “overcurrent” or
“overvoltage” trips. Refer to chapter 8 “Troubleshooting”.
Code
LCD display
Description
Setting range
Unit
Factory
setting
PAR_10
Enc Pulse
Number of encoder pulse
360 ~ 4096
1024
PAR_12
Enc Err Chk
Encoder error check
Yes
No
Yes
PAR_13
Enc LPF
Encoder LPF time constant
0 ~ 100
ms
1
6.3.4 Encoder S/W error detection (PAR_14 ~ 15: Encoder error detection time, encoder error reference
speed)
To achieve correct motor speed detection and control using encoder, proper wiring of encoder and motor should be
preceded. If operation is continued with faulty wiring of Encoder/Motor, overcurrent flows to the motor, damaging the
motor. Therefore, encoder should have functions to detect encoder input error and wrong wiring.
SV-iV5 can monitor encoder H/W error by setting PAR_12 to “Yes” and it monitors encoder pulse signal input status
to detect H/W faults such as encoder disconnection error. However, wrong wiring error cannot be detected with this
function. In this case, perform “Rotational Auto-tuning”. Set PAR_23 (AutoTuneType) to “Rotational” and perform
Encoder Test. Then wiring problem can be detected by applying voltage and checking speed detection level while motor
is running.
There are some loads (ex. Elevator) performing Encoder Test described above is difficult. To solve this fault, iV5
adopts the following functions to detect S/W faults.