YASKAWA T1000V - Page 260

6.5 Alarm Detection
260 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
LED Operator 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
Minor Fault
Output
(H2- = 10)
Motor thermostat wiring is fault (PTC
input).
Repair the PTC input wiring. YES
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.
YES
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 V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-
08 and E1-10. Note: Do not lower E1-08 and E1-10 excessively, because this reduces
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.
YES
LED Operator Display Minor Fault Name
oL3
Overtorque 1
Drive output current (or torque in OLV) was greater than L6-02 for longer than the time set in L6-03.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Inappropriate parameter settings. Check parameters L6-02 and L6-03. YES
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.
YES
LED Operator Display Minor Fault Name
oL4
Overtorque 2
Drive output current (or torque in OLV) was greater than L6-05 for longer than the time set in L6-06.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Parameter settings are not appropriate. Check parameters L6-05 and L6-06. YES
There is a fault on the machine side (e.g.,
the machine is locked up).
• Check the status of the machine being used.
• Remove the cause of the fault.
YES
LED Operator Display Minor Fault Name
oS
Overspeed (for Simple V/f with PG)
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Overshoot or undershoot is occurring.
• Adjust the gain by using the pulse train input parameters (H6-02 through H6-05).
• Adjust the speed feedback accuracy.
• Increase the settings for C5-01 (Speed Control Proportional Gain 1) and reduce C5-
02 (Speed Control Integral Time 1).
YES
PG pulse settings are incorrect.
Set the H6-02 (Pulse Train Input Scaling) = 100%, the number of pulses during
maximum motor revolutions.
YES
Parameter settings are inappropriate.
Check the setting for the overspeed detection level and the overspeed detection time
(F1-08 and F1-09).
YES