Hitachi P1-00250HFEF Basic Manual page 37

Chapter 2
■Analog input/output
(Wiring example)
Analog input/output
Ao2 Ao1 L
Frequency
meter
Terminal
Terminal name
label
COM for analog
L
power supply
Speed setting
H
power supply
Analog input
terminal 1
Ai1
(Voltage/current
selector SW1)
Analog input
terminal 2
Ai2
(Voltage/current
selector SW2)
Analog input
Ai3
terminal 3
Analog output
terminal 1
Ao1
(Voltage/current
selector SW3)
Analog output
terminal 2
Ao2
(Voltage/current
selector SW4)
■External thermistor
(Wiring example)
External thermistor
terminals
TH+ TH-
Terminal
label
External
TH+ thermistor
input
Common
terminal for
TH- external
thermistor
input
L Ai3 Ai2 Ai1
Potentiometer for frequency source
(0.5kΩ to 2kΩ)
* 1kΩ, 1W or more recommended
COM terminals for analog input terminals (Ai1,Ai2,Ai3) and
analog output terminals (Ao1,Ao2). Two L terminals are
available.
DC10V power supply. Used for voltage input with analog
input terminals (Ai1,Ai2,Ai3) using a variable resister.
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.
DC-10 to 10V voltage input is available.
Used as speed input and feedback input.
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.
Thermistor
Terminal
name
Connect to an external thermistor to make the inverter trip 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
9,999Ω.
[Recommended thermistor properties]
Allowable rated power: 100 mW or more
Impedance at temperature error: 3kΩ
SW4 SW3 SW2 SW1
H
•
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.
Description
Control circuit terminal
•
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.
Description
2-21
Installation and Wiring
Control circuit terminal
Electric characteristics
Max. allowable input current 20mA
For voltage input:
• Input impedance Approx.10kΩ
•
Allowable input voltage DC-0.3V to
12V
For current input:
• Input impedance Approx.100Ω
•
Max. allowable input current 24mA
Voltage input only:
• Input impedance Approx.10kΩ
•
Allowable voltage input DC-12V to
12V
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)
Electric characteristics
DC0 to 5V
[Input circuit]
DC5V
1kΩ
TH
2kΩ
+
Thermistor
TH-