Hitachi SJ Series User Manual page 88

Chapter 7
External thermistor
(Wiring example)
External thermistor
terminal
TH+ TH-
Terminal
symbol
External
TH+ thermistor
input
Common for
TH- external
thermistor
Thermistor
Terminal
name
When an external thermistor is connected, and
resistance abnormality occurs due to abnormal
temperature, etc., trip the inverter.
Connect the thermistor with TH+ and TH-. The level of
detecting resistance abnormality can be adjusted from
0 to 10000Ω.
[Recommended thermistor characteristics]
Recommended product: SHIBAURA ELECTRONICS
Co., Ltd. PB-41E
Allowable rated power: 100mW or more
Impedance at abnormal temperature: 3kΩ
Wire Connection and Optional Devices
Control circuit terminal area
・To prevent malfunctioning, note the
following when performing wiring.
Mal-
- For connection to the TH terminal,
functioning
twist only wires connecting to TH+
and TH-, and separate them from
other wires.
Do
- Since the current flowing in the
thermistor is very weak, separate
the wires from main circuit line
(power line).
- The
thermistor shall be within 20m.
Description
7-33
length of wiring to
Electrical
characteristics
DC0～5V
[Input circuit]
TH+
Thermistor
TH-
the
DC5V
1kΩ
2kΩ