Hitachi SH1-900H

2-21
Chapter 2
Installation and Wiring
■Analog input/output
(Wiring example)
■External thermistor
(Wiring example)
• When variable resistor is connected on H-Ai1-L terminal, voltage
input is given to inverter, Sw1 for analog input 1 (Ai1) is to be set
on "voltage" side therefore.
• If a frequency meter connected in left example is current type (4
to 20mA), set SW3 for analog output 1 (Ao1) as current output.
NOTE) Refer to section 3.9 to 3.11 for adjustment example.
• Twist the cables connected from a thermistor to the TH terminal
only between TH+ and TH-, and separate the twisted cables from
other cables.
• Since very low current flows through the cables connected to the
thermistor, separate the cables from those (power line cables)
connected to the main circuit.
• The length of the cables connected to the thermistor must be 20 m
or less.
Terminal
label
Terminal
name
Description
Electric characteristics
Voltage/current switchable analog input/output terminal
Power supply
L
Common for
analog power
supply
Common terminals for analog input terminals (Ai1,Ai2,Ai3)
and analog output terminals (Ao1,Ao2). Two L terminals are
available.
H
Speed setting
power supply
10VDC power supply. Used for voltage input with analog
input terminals (Ai1,Ai2,Ai3) using a variable resister.
Max. allowable input current 20mA
Analog input
Ai1
Analog input
terminal 1
(Voltage/current
selector SW1)
Either Ai1 or Ai2 can be used by switching the selector
switch to DC0 to 10V voltage input or 0- to 20ｍA current
input. Used as speed input and feedback input.
For voltage input:
• Input impedance Approx.10kΩ
• Allowable input voltage -0.3VDC
to 12VDC
For current input:
• Input impedance Approx.100Ω
• Max. allowable input current 24mA
Ai2
Analog input
terminal 2
(Voltage/current
selector SW2)
Ai3
Analog input
terminal 3
DC-10 to 10V voltage input is available.
Used as speed input and feedback input.
Voltage input only:
• Input impedance Approx.10kΩ
• Allowable voltage input -12VDC to
12VDC
Analog output
Ao1
Analog output
terminal 1
(Voltage/current
selector SW3)
Either Ao1 or Ao2 can be used as an output for inverter
monitoring data by switching the selector switch to DC0 to
10V voltage output or 0 to 20ｍA current output.
For voltage output:
• Max. allowable output current 2mA
• Output voltage accuracy ±10%
(Ambient temperature: 25±10
degrees C)
For current input:
• Allowable load impedance
250Ω or less
• Output current accuracy ±20%
(Ambient temperature: 25±10
degrees C)
Ao2
Analog output
terminal 2
(Voltage/current
selector SW4)
Terminal
label
Terminal
name
Description
Electric characteristics
Thermistor terminal
Analog input
TH+
External
thermistor
input
Connect to an external thermistor and trip the inverter if an
abnormal temperature is detected.
Connect the thermistor to TH+ and TH-. The impedance to detect
temperature errors can be adjusted within the range 0Ω to
10,000Ω.
[Recommended thermistor properties]
Allowable rated power: 100 mW or more
Impedance at temperature error: 3kΩ
DC0 to 5V
[Input circuit]
TH-
Common
terminal for
external
thermistor
input
TH-
TH+
External thermistor
terminals
Thermistor
DC5V
1kΩ
DC5V
1kΩ
DC5V
1kΩ
DC5V
1kΩ
2kΩ
2kΩ
2kΩ
2kΩ
TH-
TH-
TH-
TH
+
TH
+
TH
+
Thermistor
Thermistor
Thermistor
Thermistor
Control circuit terminal
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Control circuit terminal section
Ao2
Ao1
Analog input/output
H
Ai1
Ai2
Ai3
L
L
Potentiometer for frequency source
(0.5kΩ to 2kΩ)
* 1kΩ, 1W or more recommended
Frequency
meter
SW4 SW3 SW2 SW1
Control circuit terminal