YASKAWA L1000A - UL and CSA Standards

5.8 L: Protection Functions
226 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Figure 5. 35
Figure 5.35 Connection of a Motor PTC Thermistor
The PTC thermistor must have the following characteristics for one motor phase. The drives motor overload detection
requires three PTC thermistors to be connected in series.
Figure 5. 36
Figure 5.36 Motor PTC Thermistor Characteristics
Overheat detection using a PTC thermistor is configured with parameters L1-03, L1-04, and L1-05 as explained below.
■
L1-03: Motor Overheat Alarm Operation Selection (PTC thermistor input)
Note: Available in drive software PRG: 7017 or later.
Sets the drive operation when the PTC thermistor input signal reaches the motor overheat alarm level (oH3).
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: Emergency Stop (Fast Stop)
The drive stops the motor using the deceleration time set in parameter C1-09.
Setting 3: Alarm only
The operation is continued and an oH3 alarm is displayed on the digital operator.
No. Parameter Name Setting Range Default
L1-03 Motor Overheat Alarm Operation Selection (PTC thermistor input) 0 to 3 3
Drive
+V
(+10.5 V, 20 mA)
Branch
resistor
12 k
Ω
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
Resistance (Ω)
Class F
150
°C (302°F)
Class H
180°C (356°F)
1330
Tr - 5K (oH3 Alarm Level) Tr + 5K (oH4 Fault Level)
Temperature
Tr: threshold value
Tr
Tr’
550
YEA_TMon
-
ly
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