5 electrical installation – Yaskawa AC Drive-L1000E Safety Precautions User Manual
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5 Electrical Installation
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YASKAWA TOEP YAIL1E 02A YASKAWA AC Drive - L1000E Safety Precautions
Motor Protection Using a Positive Temperature Coefficient (PTC thermistor)
A motor PTC thermistor can be connected to an analog input of the drive. This input is used by the drive for motor
overheat protection.
When the PTC thermistor input signal reaches the motor overheat alarm level, an oH3 alarm will be triggered and the
drive will continue operation according to the setting of L1-03. When the PTC thermistor input signal reaches the
overheat fault level, an oH4 fault will be triggered, a fault signal will be output, and the drive will stop the motor using the
stop method setting in L1-04.
Connect the PTC thermistor between terminals AC and A2 as shown in
. Set parameter H3-09 to 0 and parameter
H3-10 to E
Figure 8
Figure 8 Connection of a Motor PTC Thermistor
The PTC thermistor must have the characteristics shown in
for one motor phase. The drives motor overload
detection requires three PTC thermistors to be connected in series.
Figure 9
Figure 9 Motor PTC Thermistor Characteristics
Overheat detection using a PTC thermistor is configured with parameters L1-03, L1-04, and L1-05 as explained below.
Drive
+V
(+10.5 V, 20 mA)
Branch
resistor
12 k
PTC
thermistor
A2 (0-10 V)
AC
Multi-function digital input
MA
Fault output
Multi-function
digital outputs
MB
MC
M1
M2
M3
M4
M5
M6
Tr’
Tr + 5K (oH4 Fault Level)
Tr - 5K (oH3 Alarm Level)