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1.8 L: Protection Functions
The PTC must exhibit the characteristics shown in
drive expects 3 of these PTCs to be connected in a series.
Set up overheat detection using a PTC using parameters L1-03, L1-04, and L1-05 as explained in the following sections.
n
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
Motor Overheat Alarm Operation Selection (PTC input)
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 HOA keypad.
n
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
Motor Overheat Fault Operation Selection (PTC input)
108
+V
(+10.5V, 20 mA)
Branch
resistor
12 k
A2 (0-10 V)
PTC
thermistor
AC
Figure 1.61 Connection of a Motor PTC
Figure 1.62
Resistance ( )
Tr - 5K (oH3 Alarm Level)
Tr
Figure 1.62 Motor PTC Characteristics
Name
Name
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
Drive
Jumper S1
Terminal A1/A2
Voltage/Current
Selection
V
I
A1
A2
for one motor phase. The motor overload protection of the
Class H
Class F
180 ºC
150 ºC
Tr: threshold value
Temperature
Tr'
Tr + 5K (oH4 Fault Level)
Setting Range
0 to 3
Setting Range
0 to 2
Default
3
Default
1
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