GE Fuji Electric MICRO-SAVER AF-300, Руководство для стартапов

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Table 2.4 Symbols, Names and Functions of the Control Circuit Terminals
Classifi-
cation
Symbol Name
Functions
Analog input
[13] Potentiometer
power supply
Power supply (+10 Vdc) for frequency command potentiometer (Potentiometer: 1 to
5 kΩ)
Allowable output current: 10 mA
[12] Voltage input (1) The frequency is set according to the external analog input voltage.
0 to +10 (Vdc)/0 to 100 (%) (Normal mode operation)
+10 to 0 (Vdc)/0 to 100 (%) (Inverse mode operation)
(2) Used for reference signal (PID process command) or PID feedback signal.
(3 Used as additional auxiliary setting for various main frequency commands.
* Input impedance: 22 kΩ
* Allowable maximum input voltage is 15 Vdc. If the input voltage is 10 Vdc or
over, the drive assumes it to be 10 Vdc.
[C1] Current input (1) The frequency is set according to the external analog input current command.
4 to 20 (mA dc)/0 to 100 (%) (Normal mode operation)
20 to 4 (mA dc)/0 to 100 (%) (Inverse mode operation)
(2) Used for reference signal (PID process command) or PID feedback signal.
(3) Connects PTC thermistor for motor protection.
(4) Used as additional auxiliary setting to various main frequency commands.
* Input impedance: 250 Ω
* Allowable input current is 30 mA dc. If the input current exceeds 20 mA dc,
the drive will limit it at 20 mA dc.
[11] Analog common Common terminal for analog input and output signals
:
NOTE: The control signal lines handle weak analog signals that are susceptible to external noise and interference, so
use shielded wires and keep them as short as possible (less than 66 ft / 20 m). It is recommended that the shield-
ing conductor of those wires be grounded. If grounding causes control signals to be affected by external induction
noise, connect the shield to terminal [11], which may be effective for noise reduction. As shown in Figure 2.13,
ground the single end of the shield to enhance the shielding effect.
Use a twin contact relay for weak signals if a relay is used in the circuit. Do not connect the relay’s contact to
terminal [11].
When the drive is connected to an external device putting out an analog signal, malfunctions may be caused by
electric noise generated by the drive. If this happens, depending on the circumstances, connect a ferrite core (a
ring core or its equivalent) to the device outputting the analog signal and/or connect a capacitor with good cut-off
characteristics for high frequency between the control signal cables, as shown in Figure 2.14.
Figure 2.13 Connection of Shielded Wire Figure 2.14 Example of Electric Noise Prevention
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