YASKAWA Z1000U Technical Manual page 227

HOA Keypad Display
There is a fault on the machine side (e.g., the
machine is locked up)
Motor has overheated
HOA Keypad Display
oL3
Cause
Inappropriate parameter settings
There is a fault on the machine side (e.g., the
machine is locked up)
HOA Keypad Display
ov
Cause
Surge voltage present in the drive input power.
Drive input power voltage is too high.
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.
An I/O terminal is loose.
There is a phase loss or an imbalance in the
interphase voltages of the input power supply.
HOA Keypad Display
PASS
Cause
MEMOBUS/Modbus test has finished normally
HOA Keypad Display
SAFE
Cause
External contact from customer wiring is open.
HOA Keypad Display
SE
Cause
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
• Check the status of the machine.
• Remove the cause of the fault.
• 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.
Overtorque 1
Drive output current was greater than L6-02 for longer than the time set to L6-03.
Check parameters L6-02 and L6-03.
• Check the status of the machine.
• Remove the cause of the fault.
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
Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the
same drive input power system.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
Implement countermeasures so that chattering does not occur for the input power supply.
Check the tightening torque of the I/O terminals.
Check the status of the input power supply and eliminate phase losses and imbalance.
MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
Customer Safety
Customer Safeties multi-function input is open. This alarm has display priority over the Interlock
Open (inTLK).
Check the cause of the open safety.
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).
Minor Fault Name
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.5 Alarm Detection
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