EM-1359
- 16 -
♦
When installing/relocating the valve or connecting the cable, be sure to turn off
the main power supply in advance. Failure to do so may cause electric shock,
fire, amplifier malfunction, or failure.
♦
Be sure to use the specified power supply voltage (24 V DC). Failure to do so
may cause fire or electric shock.
♦
The permissible power supply voltage fluctuation for the on-board amplifier is ±
10%. Surge voltage exceeding the permissible range may cause malfunction of
the amplifier. To prevent such cases, take measures against noise, such as
inserting a noise filter on the power supply side.
♦
Do not share the AC power source to the DC power supply with high noise
generating equipment (solenoid operated directional valves, heaters, motors,
etc.).
♦
If high noise generating equipment (e.g. inverter) is located in the same cabinet,
use separate power supply filters and earth wires.
5.3 Block diagram
The circuit of the on-board amplifier is shown below.
CAUTION
WARNING
Power
Supply
Input
Signal
Input (+)
Input (-)
Spool Travel
Monitoring
COM
Protective Earth
Power
Indicator
Deviation
Alarm
Internal
Power
Supply
(Green)
(Red)
Low Voltage
Detection Circuit
LVDT Amplifier
The input stage for the models (F-)ELDFG-*EH-*-*-*-*-E/F (current signal) is as follow.
Input Signal
Input (+)
Input (-)