5.8 L: Protection Functions
188 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
The PTC must have the following characteristics for one motor phase. Normally a motor is protected by three PTCs
connected in series.
Figure 5. 67
Figure 5.67 Motor PTC Characteristics
Overheat detection using a PTC can be set up by parameters L1-03, L1-04, and L1-05 as explained below.
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L1-03: Motor Overheat Alarm Operation Selection (PTC input)
Determines what action the drive should take when the PTC input signal reaches the motor overheat alarm level (PTC
input level: Tr-5
°C).
Setting 0: Ramp to Stop
The drive stops the motor using the active deceleration time.
Setting 1: Coast to Stop
The drive output is switched off and the motor coasts to stop.
Setting 2: Fast-stop
The drive stops the motor using the Fast-stop time set in parameter C1-09.
Setting 3: Alarm Only
The operation is continued and an oH3 alarm is displayed on the digital operator.
■
L1-04: Motor Overheat Fault Operation Selection (PTC input)
Determines what action the drive should take when the PTC input signal reaches the motor overheat fault level (PTC
input level: Tr-5
°C).
Setting 0: Ramp to Stop
The drive stops the motor using the active deceleration time.
Setting 1: Coast to Stop
The drive output is switched off and the motor coasts to stop.
Setting 2: Fast-stop
The drive stops the motor using the Fast-stop time set in parameter C1-09.
■
L1-05: Motor Temperature Input Filter Time (PTC input)
Used to set a filter on the PTC signal in order to prevent a motor overheat fault from being mistakenly detected.
No. Name Setting Range Default
L1-03 Motor Overheat Alarm Operation Selection (PTC input) 0 to 3 3
No. Name Setting Range Default
L1-04 Motor Overheat Fault Operation Selection (PTC input) 0 to 2 1
No. Name Setting Range Default
L1-05 Motor Temperature Input Filter Time (PTC input) 0.00 to 10.00 s 0.20 s
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