Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 257)

HOA Keypad Display Minor Fault Name
Motor has overheated
• Check the load size, accel/decel times, and cycle times.
• Decrease the load.
• Increase accel and decel times (C1-01 and C1-02).
• 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
Cause Possible Solution
Surge voltage present in the drive input power.
Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the
same drive input power system.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The capacity of the input power supply is too small. Use a power supply that has at least twice the input capacity of the drive.
The input power supply repeatedly turned on and
off over a short period of time.
Implement countermeasures so that chattering does not occur for the input power supply.
An I/O terminal is loose. Check the tightening torque of the I/O terminals.
There is a phase loss or an imbalance in the
interphase voltages of the input power supply.
Check the status of the input power supply and eliminate phase losses and imbalance.
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
SAFE
Customer Safety
Customer Safeties multi-function input is open. This alarm has display priority over the Interlock
Open (inTLK).
Cause Possible Solutions
External contact from customer wiring is open. Check the cause of the open safety.
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
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running
Stop the drive and run the test again.
6.5 Alarm Detection
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 257
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Diagnostics & Troubleshooting