Block Diagram - YUKEN KOGYO ELDFG-01EH 10 Series Instruction Manual

WARNING
♦ 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.
CAUTION
♦ 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.
Power
Supply
Input (+)
Input
Signal
Input (-)
Spool Travel
Monitoring
COM
Protective Earth
Input Signal
Power
Indicator
(Green)
The input stage for the models (F-)ELDFG-*EH-*-*-*-*-E/F (current signal) is as follow.
Input (+)
Input (-)
Low Voltage
Detection Circuit
Internal (Red)
Deviation
Power
Alarm
Supply
LVDT Amplifier
- 16 -
EM-1359