YASKAWA Z1000 User Manual page 222

5.5 Alarm Detection
Digital Operator Display
Cause
An external device triggered an overheat
warning in the drive.
Digital Operator Display
Cause
Motor thermostat wiring is faulty (PTC
input).
There is a fault on the machine side (e.g.,
the machine is locked up).
Motor has overheated.
Digital Operator Display
Cause
Motor has overheated
222
Drive Overheat Warning
oH2
"Drive Overheat Warning" was input to a multi-function input terminal, S1 through S7 (H1-oo= B).
Search for the device that tripped the overheat warning. Remove the cause of the problem.
Motor Overheat
oH3
The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level (H3-02,
H3-06 or H3-10 = E).
Repair the PTC input wiring.
• 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 to C1-04).
• 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.
Motor Overheat Fault (PTC Input)
oH4
• The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level.
• Detection requires setting multi-function analog inputs H3-02, H3-10, or H3-06 to E.
• Check the size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-04).
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Fault Name
Possible Solution
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual