2-15
Chapter 2: Installation
2.2.5 Power supply for input signal and travel transmission
■
Input signal
The input signal to the device is 4 to 20 mA. In addition, this input signal is used as the
power supply.
Note
•
Do not allow a current of 24 mA DC or higher.
•
The device will not operate properly with a current of less than 3.85 mA.
•
If the current drops below 3.85 mA, the travel transmission output will go to burn-
out (fail-safe) level (up or down (undefined)).
•
When starting from 0 mA, it may take some time until travel changes. After power
is turned on, use a 3.85 mA or greater signal. In this state, response time will not be
slow. On the contrary, when using a 3.85 mA or greater signal, if the flow pressure
fluctuates greatly when the valve is fully closed, overshoot may occur at the first
startup. To suppress overshoot, temporarily lower the input signal to 0 mA.
Caution
•
Do not apply excessive voltage (for example, connecting a 24 V DC power supply
without resistance) to the input signal terminal. Doing so can cause the electric
board to burn out, and the device to fail.
■
Power supply and load resistance for travel transmission
Make sure that the load resistance of the electric lines connected to the travel transmis-
sion loop, with respect to the power supply voltage used, is within the operable range
shown in the diagram below.
605
1560
245
16.5
24
45
0
Load r
esistance (Ω)
Supply voltage (V DC)
Operable range
Figure 2-16. Supply Voltage and Load Resistance Characteristics
Note
Do not apply a voltage of 45 V or higher.
Summary of Contents for AVP200
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Page 136: ...6 16 For models those date of manufacture are after October 2017...
Page 138: ...6 18 For models those date of manufacture are after October 2017...
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