YASKAWA iQpump Series Programming Manual page 74

Figure 1.69
10V
Factory Default
Function: Motor Temperature (Setting: E)
In addition to or in place of the OL1 (Motor Overload) fault of the Drive, it is possible to use a PTC (Positive Temperature Coefficient)
thermistor for motor insulation protection. The PTC thermistors are built into the windings of some motors and will vary their resistance
based on temperature. An example PTC characteristic is show below.
Figure 1.70
Figure 69 PTC Thermistor Temperature-Resistance Value Characteristics
Connection of the thermistor to the iQpump drive is shown below, in addition make sure Dip Switch S1-2 is in the OFF position, see
Figure 70.
Figure 1.71
Branch resistance
*1
18 kΩ
PTC Thermistor
*1
using a 3-phase PTC with the characteristics shown in
the figure below.
74
H3-02
H3-03
A1 Voltage
Figure 68 Frequency Bias 2 Applied to Analog Speed Command
Resistance (ohms)
1330
550
Tr 5
The resistance value of 18 kΩ is only valid for
above.
Figure 70 Thermistor to Drive Connection Diagram
A1 Voltage
10V
With H3-03 applied
Class H
Class F
180
150
Tr: Temperature threshold value
Temperature
Tr
Tr Tr+5
+V
(+15 V, 20 mA)
A2
(0-10 Vdc)
Rbranch
AC
H3-02
H3-03
10V
With both H3-03 and analog input bias
(H3-09=0) applied
(H3-09=D) applied
( R x3) x ( V -V
ptc@Tr S ptc@OH3
=
V
ptc@OH3
YASKAWA TM.iQp.02 iQpump Drive Programming Manual
A1 Voltage
)