3 Mechanical and Electrical Installation NICE3000
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User Manual
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3.3.2 Analog Differential Input (AI)
Quantity 2
Code Ai/M
Input voltage -10 to 10 VDC
Input impedance 33.9 kΩ
The two AI terminals are used for input of the analog load cell. Weak analog voltage signals are easy to
suffer external interference, and therefore the shielded cable must be used and the cable length must be
less than 20 m. In applications where the analog signal suffers severe interference, install a îš¿lter capacitor
or ferrite magnetic core at the analog signal source.
Figure 3-23 Analog differential input circuit
-
+
A
D
ARM
Differential input
M
Ai
Operational
amplifier
CN9
3.3.3 Relay Output (DO)
Quantity 6
Code Y1/M1 to Y6/M6
Function code F5-26 to F5-31
Relay characteristics
Rated load 5 A, 250 VAC/30 VDC
Maximum current 5 A
Response time 10 ms
A total of six relay outputs are provided. The optocoupler isolated ARM I/O signals control the relay line
package current. After the line package is energized, the corresponding signal indicator becomes ON. The
relay outputs do not have the common ground.
The inductive load (relay, contactor, and motor) causes voltage peak after the current is removed. A varis-
tor is used at the relay contact, and a absorption circuit such as varistor , RC absorption circuit, or diode is
installed on the inductive load to reduce the interference to the minimum.
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