YASKAWA CIMR-SSA Series Instruction Manual page 92

APPENDIX 7 ZDEV CAUSES AND CORRECTIVE ACTIONS LIST
ZDEV Error Detection
Phase-Z pulse not Although the pulses of phase-A or -B were
counted detection counted while the motor rotated 3 times, the
pulses of phase-Z were never counted.
Error display: ZDEV
Detected while the power supply is ON.
Phase-Z noise error The phase-Z pulse has been detected to have
detection unusual timing 10 consecutive times (The dif-
ference between the previously detected
Error display: ZDEV
phase-Z and the currently detected phase-Z is
outside of the allowable range of ±5 degrees
for the electrical angle during one motor rota-
tion.)
Detected while the power supply is ON.
Reverse detection de- If the torque reference is positive (negative).
tected
1. In the state where the acceleration speed is
Error display: ZDEV
negative (positive), the difference between
the speed reference and the motor speed is
continuously 10% or more for the detection
time (constant F1-11) or longer.
2. In the state where the acceleration speed is
negative (positive), the difference between
the speed reference and the motor speed is
30% or more.
Detected only while the motor is running.
Causes
S Incorrect wiring of PG cable
S Damaged PG card
S Damaged PG (motor side)
S Noise interference on PG cable
S Incorrect wiring of PG cable
S Damaged PG card
S Damaged PG (motor side)
S Incorrect setting of PG zero-pulse com-
pensation amount (C2-13)
S Noise interference on PG cable (phase A or
-B)
S Incorrect wiring of PG cable
S Damaged PG card
S Damaged PG (motor side)
S One of the operation conditions described
in the left column was valid.
S The main leads of the motor are not correct-
ly connected to the U, V, and W terminals.
S The setting of the rotation direction of the
PG (F1-05) does not agree with the main
leads of the motor.
S Disconnection of the PG cable for phase-Z.
1. Check the PG cable connection.
2. Check the A, B, and Z pulses using the check pins on the PG card.
If an erroneous pulse is detected, investigate the noise source. If leakage from the power supply is the cause, modify
the grounding line.
If an usual waveform is detected, replace the PG card or PG.
1. Check the PG cable connection.
2. Check the A, B, and Z pulses using the check pins on the PG card.
If an erroneous pulse is detected, investigate the noise source. If leakage from the power supply is the cause, change
the grounding line.
If an usual waveform is detected, replace the PG card or PG.
Note: If using standard software, turn OFF the power supply to reset ZDEV.
1. Confirm that the main leads of the motor are correctly connected to the U, V, and W terminals.
2. Confirm that the value of ∆θ on the motor nameplate is the same as the set value of the PG zero-pulse compensation
amount (C2-13). After replacing the PG or changing the direction in which the motor runs forward, adjust the PG
zero-pulse. (Refer to page 49 through 51.)
3. Confirm that the motor rotation direction is correct. (Refer to page 48 and 49.)
4. Check if the motor is not rotated from load side under the conditions 1 or 2 described in the left column.
5. Check the A, B, and Z pulses using the check pins on the PG card.
If an erroneous pulse is detected, investigate the noise source. If leakage from the power supply is the cause, change
the grounding line.
If an unusual waveform is detected, replace the PG card or PG.
6. Check the PC card wiring.
If any wires are disconnected, reconnect the wires correctly. (Refer to page 22.)
Corrective Actions