Hitachi SJ Series - Page 88

7-33
Chapter 7
Wire Connection and Optional Devices
External thermistor
(Wiring example)
・To prevent malfunctioning, note the
following when performing wiring.
- For connection to the TH terminal,
twist only wires connecting to TH+
and TH-, and separate them from
other wires.
- Since the current flowing in the
thermistor is very weak, separate
the wires from main circuit line
(power line).
- The length of wiring to the
thermistor shall be within 20m.
Terminal
symbol
Terminal
name
Description
Electrical
characteristics
Thermistor terminal
Analog input
TH+
External
thermistor
input
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
DC0～5V
[Input circuit]
TH-
Common for
external
thermistor
Mal-
functioning
Do
Control circuit terminal area
DC5V
1kΩ
2kΩ
TH-
TH+
Thermistor
TH-
TH+
External thermistor
terminal
Thermistor