YASKAWA V1000 Technical Manual page 206

5.8 L: Protection Functions
The PTC must have the following characteristics for one motor phase. Normally a motor is protected by three PTCs
connected in series.
Overheat detection using a PTC can be set up by parameters L1-03/04/05 as explained below.
n L1-03: Motor Overheat Alarm (oH3) Operation Selection
Sets the drive operation when the PTC input signal reaches the motor overheat alarm level. (PTC input level: Tr - 5 °C)
No.
L1-03
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
n L1-04: Motor Overheat Fault (oH4) Operation Selection
Sets the drive operation when the PTC input signal reaches the motor overheat fault level. (PTC input level: Tr + 5 °C)
No.
L1-04
Setting 0: Ramp to Stop
The drive stops the motor using the active deceleration time.
206
Multi-function input
Branch
resistor
12 k
PTC
thermistor
Figure 5.77 Connection of a Motor PTC
Figure 5.78 Motor PTC Characteristics
Name
Motor Overheat Alarm Operation Selection
Name
Motor Overheat Fault Operation Selection
Drive
+V
(+10.5V, 20 mA)
A2 (0-10 V)
AC
Tr'
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
MA
Multi-function
MB
output (contact)
MC
P1
Multi-function
P2
output (photocoupler)
PC
Setting Range
0 to 3
Setting Range
0 to 2
Default
3
Default
1