Analog Input Operation - Hitachi SJ100 Series Instruction Manual
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- Instruction manual (214 pages) ,
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Analog Input Operation
The SJ100 inverters provide for analog input
to command the inverter frequency output
value. The analog input terminal group
includes the L, OI, O, and H terminals on the
control connector, which provide for Voltage
[O] or Current [OI] input. All analog input
signals must use the analog ground [L].
If you use either the voltage or current analog
input, you must select one of them using the
logic input terminal function [AT] analog
type. If terminal [AT] is Off, the voltage input
[O] can command the inverter output
frequency. If terminal [AT] is On, the current
input [OI] can command the inverter output
frequency. The [AT] terminal function is
covered in the logic input section on page
4–17. Remember that you must also set
A01 = 01 to select analog input as the
frequency source.
NOTE: If no logic input terminal is configured for the [AT] function, then inverter sums
the voltage and current input to determine the desired input value.
Using an external potentiometer is a popular
way to control the inverter output frequency
(and a good way to learn how to use the
analog inputs). The potentiometer uses the
10V reference [H] and the analog ground [L]
for excitation, and the voltage input for the
signal. By default, the [AT] terminal selects
the voltage input when it is Off. Take care to
use the proper resistance for the potentiometer, which is 1 to 2 k Ohms, 2 Watts.
Voltage Input – The voltage input circuit
uses terminals [L] and [O]. Attach the cable
shield wire only to terminal [L] on the
inverter. Maintain the voltage within specifi-
cations (do not apply negative voltage).
Current Input – The current input circuit
uses terminals [OI] and [L]. The current come
from a sourcing type transmitter; a sinking
type will not work! This means the current
must flow into terminal [OI], and terminal [L]
is the return back to the transmitter. The input
impedance from [OI] to [L] is 250 Ohms.
Attach the cable shield wire only to terminal [L] on the inverter.
SJ100 Inverter
FM
H
O
OI
L
+V Ref.
Voltage input
Current input
A GND
A01
V/I input
select
[AT]
FM
CM2
H
O
OI
L
4-20 mA, AT= On
0-10 V, AT= Off
+ –
FM
H
O
OI
L
1 to 2 k Ohms, 2 Watts
FM
CM2
H
O
OI
L
0 to 9.6 VDC,
0 to 10V nominal
+ –
FM
CM2
H
O
OI
L
4 to 19.6 mA DC,
4 to 20 mA nominal
See I/O specs on page 4–5.
4–27
CM2
12
11
Frequency
setting
12
11
CM2
12
11
12
11
12
11
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