YASKAWA U1000 Series Technical Manual page 300

5.8 L: Protection Functions
Figure 5.90
The PTC must have the following characteristics for one motor phase. The drives motor overload detection expects 3 of
these PTCs to be connected in series.
Figure 5.91
Overheat detection using a PTC can be set up by parameters L1-03, L1-04, and L1-05 as explained below.
L1-03: Motor Overheat Alarm Operation Selection (PTC input)
■
Sets the drive operation when the PTC input signal reaches the motor overheat alarm level (oH3).
No.
L1-03
Setting 0: Ramp to stop
The drive stops the motor using the deceleration time 1 set in parameter C1-02 .
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)
■
Sets the drive operation when the PTC input signal reaches the motor overheat fault level (oH4).
No.
L1-04
300
Multi-function input
A3 (0-10 V)
PTC
thermistor
AC
Figure 5.90 Connection of a Motor PTC
Tr - 5K (oH3 Alarm Level)
Figure 5.91 Motor PTC Characteristics
Name
Motor Overheat Alarm Operation Selection (PTC input)
Name
Motor Overheat Fault Operation Selection (PTC input)
Drive
MA
MB
MC
DIP Switch S4
PTC
M1
M2
AI
M3
M4
M5
M6
Tr'
Tr + 5K (oH4 Fault Level)
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Fault output
Multi-function
digital outputs
Setting Range
0 to 3
Setting Range
0 to 2
Default
3
Default
1