Fail-Safe Function; Electrical Specifications - YUKEN KOGYO ELDFG-01EH 10 Series Instruction Manual

2.4 Fail-safe function

With reference to the information given below, select the option for the fail-safe function
according to the use of applications. A separate safety circuit should be provided if the
hydraulic actuator must be reliably held or stopped to ensure safety in the event of electric
failure (power failure, power cable disconnection, etc.) or upon startup.
- Electric System: OFF
Model Number
(F-)ELDFG-*EH-*-3C2-XY-C
(F-)ELDFG-*EH-*-3C2L-XY-C
(F-)ELDFG-*EH-*-3C40-XY-C
(F-)ELDFG-01EH-*-*-XY-A
(F-)ELDFG-01EH-*-*-XY-B
(F-)ELDFG-03EH-*-*-XY-A
(F-)ELDFG-03EH-*-*-XY-B
*1. The fail-safe function's activation time depends on the electric and hydraulic conditions.

2.5 Electrical specifications

Valve Model
Pin A
Pin B
Pin C
Pin D
Pin E
Pin F
Pin
*1. Differential input signals can be used only for the valves with the voltage signal
specifications of ±10 V (ELDFG-*EH-*-D).
*2. The recommended load resistance is 200 Ω.
● I/O Signal Characteristics
Spool
Position
Neutral
Neutral
Neutral
ab.20%
ab.20%
ab.17%
ab.17%
ELDFG-*EH-*-D
24 V DC (21.6 - 26.4 V DC Included Ripple), 75 VA or more
Power Supply
Signal Common
Input (+)
*1
(Differential) 0 - ±10 V
Input (-) Ri
*1
(Differential)
Spool Travel 0 - ±10 V
Monitoring Ri
Protective Earth
Fail-Safe Function
Function
All Ports Blocked
-
A, B, T Connection
P→A→B→T Position
P→B→A→T Position
P→A→B→T Position
P→B→A→T Position
ELDFG-*EH-*-E
0 V
COM (0 V)
4 - 20 mA
50 kΩ Ri = 200 Ω
≧
4 - 20 mA
10 kΩ Ri = 100 - 500 Ω
≧
-
Input Signal
- 10 -
EM-1359
*1
Graphic Symbols
or or
ELDFG-*EH-*-F
0 - ±10 mA
Ri = 200 Ω
0 - ±10 mA
*2 *2
Ri = 100 - 500 Ω