YASKAWA HV600, Technical Reference

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5.8 L: Protection Functions
336 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
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L5-53: Thermostat Fault Retry Selection
No.
(Hex.)
Name Description
Default
(Range)
L5-53
(3251)
Thermostat Fault Retry
Selection Sets the drive to try an Auto Restart if it detects a VLTS [Thermostat Fault] fault. 1
(0, 1)
Note:
•
To use this function, set S5-01 ≠ 0 [HAND Frequency Reference Source ≠ HAND Analog Input]
•
The drive will only restart after the Thermostat digital input deactivates and the L5-04 [Interval Method Restart Time] timer is expired.
0 : No Retry
1 : Retry
Figure 5.83 shows the drive operation for VLTS when L5-53 = 1 and L5-01 [Number of Auto-Restart Attempts] > 0
times . The drive will wait for the Thermostat digital input to deac the L5-04 time before it will restart.
H1-xx = 188: !Thermostat Fault
H2-xx = 95: Thermostat Fault L5-04: Interval Method Restart Time
VLTS Fault: Thermostat Fault
Figure 5.83 Thermostat Fault Behavior
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L6: Torque Detection
The overtorque/undertorque/underload detection function prevents damage to machinery and loads.
Overtorque is when there is too much load on the machine. If the motor current or output torque is at the overtorque
detection level for the overtorque detection time, the drive will output an alarm and turn off the output.
Undertorque and underload are when a load suddenly decreases. When the motor current or output torque is at the
undertorque/underload detection level for the undertorque detection time, the drive will output an alarm and turn off
the output.
You can use the undertorque/undeload detection function to detect these conditions, for example:
• Machine belt breaks
• Unusual operation of the electromagnetic contactor on the drive output side
• Clogged output side air filters in fans and blowers
Note:
If there is oC [Overcurrent] or oL1 [Motor Overload] , the drive can stop during overtorque conditions. Use torque detection to identify
overload conditions before the drive detects oC or oL1 and stops. Use this function to detect problems in the application.
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Parameter Setting
You can individually set the two overtorque/undertorque detection functions with the drive. Use the information in
Table 5.47 to set the parameters.