Yaskawa Z1000U User Manual
Page 209
Airflow around the drive is restricted
• Provide proper installation space around the drive as indicated in the manual.
Orientation and Spacing on page 42
for details.
• Allow for the proper space and ensure that there is sufficient circulation around the control panel.
• Check for dust or other foreign materials clogging the cooling fan.
• Clear debris caught in the fan that restricts air circulation.
HOA Keypad Display
Minor Fault Name
oH2
Drive Overheat Warning
“Drive Overheat Warning” was input to a multi-function input terminal, S1 through S7 (H1-oo=
B).
Cause
Possible Solutions
An external device triggered an overheat warning
in the drive
Search for the device that tripped the overheat warning. Remove the cause of the problem.
HOA Keypad Display
Minor Fault Name
oH3
Motor Overheat
The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level
(H3-02 or H3-10 = E).
Cause
Possible Solutions
Motor thermostat wiring is faulty (PTC input).
Repair the PTC input wiring.
There is a fault on the machine side (e.g., the
machine is locked up)
• Check the status of the machine.
• Remove the cause of the fault.
Motor has overheated
• Check the load size, accel/decel times, and cycle times.
• Decrease the load.
• Increase accel and decel times (C1-01 to C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This involves reducing E1-08 and E1-10.
Note:
Refrain from lowering E1-08 and E1-10 excessively to prevent a reduction in load
tolerance at low speeds.
• Check the motor-rated current.
• Enter motor-rated current on motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
HOA Keypad Display
Minor Fault Name
oL3
Overtorque 1
Drive output current was greater than L6-02 for longer than the time set to L6-03.
Cause
Possible Solutions
Inappropriate parameter settings
Check parameters L6-02 and L6-03.
There is a fault on the machine side (e.g., the
machine is locked up)
• Check the status of the machine.
• Remove the cause of the fault.
HOA Keypad Display
Minor Fault Name
ov
Control Circuit Overvoltage
Voltage in the control circuit has exceeded the trip point.
• For 200 V class drives: approximately 450 V
• For 400 V class drives: approximately 900 V
HOA Keypad Display
Minor Fault Name
PASS
MEMOBUS/Modbus Comm. Test Mode Complete
Cause
Possible Solutions
MEMOBUS/Modbus test has finished normally
This verifies that the test was successful.
HOA Keypad Display
Minor Fault Name
SE
MEMOBUS/Modbus Communication Test Mode Error
Note:
This alarm will not trigger a multi-function output terminal that is set for alarm output
(H2-oo = 10).
Cause
Possible Solutions
5.5 Alarm Detection
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual
209
5
Troubleshooting