Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 101)

Drive
+V
(+10.5V, 20 mA)
Branch
resistor
12 k
PTC
thermistor
A2 (0-10 V)
AC
Jumper S1
Terminal A1/A2
Voltage/Current
Selection
V
I
A2 A1
Figure 1.59 Connection of a Motor PTC
The PTC must exhibit the characteristics shown in Figure 1.60 for one motor phase. The motor overload protection of the
drive expects 3 of these PTCs to be connected in a series.
Resistance ( )
Class F
150 ºC Class H
180 ºC
Tr: threshold value
Temperature
Tr’
Tr + 5K (oH4 Fault Level) Tr Tr - 5K (oH3 Alarm Level)
Figure 1.60 Motor PTC Characteristics
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. Name Setting Range Default
L1-03 Motor Overheat Alarm Operation Selection (PTC input) 0 to 3 3
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. Name Setting Range Default
L1-04 Motor Overheat Fault Operation Selection (PTC input) 0 to 2 1
1.8 L: Protection Functions
YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual 101
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Parameter Details