Manual 35132
VariStroke-DX Duplex Hydraulic Servo Skid
Woodward
17
Table 2-3. VS-DX without Junction Box Version (to Each VS Unit)
Supply Voltage: (18 to 32) V (dc), 24 V (dc) nominal (use cable at least
1.5 mm² / 16 AWG)
Hold-up time: 7 ms @ 2 A (dc) LAT current
Current Consumption: 2.3 A (MAX) at steady state @ 24 V 10 A transient (100 ms maximum)
Demand Signals #1, 2: (4 to 20) mA into 200
Ω
. >70 dB CMRR. Common Mode Voltage Range
±50 V (dc), Accuracy 0.1% of full scale @ 25 °C
Hold-up time: 7 ms @ 2 A (dc) LAT current
Current Consumption: 2.3 A (MAX) at steady state @ 24 V 10 A transient (100 ms maximum)
Demand Signals #1, 2: (4 to 20) mA into 200
Ω
. >70 dB CMRR. Common Mode Voltage Range
±50 V (dc), Accuracy 0.1% of full scale @ 25 °C
Cylinder Position
Feedback Signals #1, 2:
(4 to 20) mA into 235
Ω
. >70 dB CMRR Common Mode Voltage Range ±50
V (dc), Accuracy 0.1% of full scale @ 25 °C
Analog Output Signal (4 to 20) mA. Maximum external load: 500
Ω
Accuracy ±0.5 % of full scale
@ 25 °C
Discrete Output Signal Configurable for NO or NC,
0.5 A at 24 V (dc), max. 32 V (dc)
0.5 A inductive at 28 V (dc) 0.2 Henry
Discrete Input Signal: Contact current 3.8 mA (typ.) @ input closed
Max input voltage 32 V (dc), High signal threshold > 7 V; Low
signal Threshold < 3 V
Cable Entries: Analog: 0.750”-14 NPT
Power: 0.750”-14 NPT
CAN: 0.500”-14 NPT
Spare: 0.500”-14 NPT
Grounding Connections: PE Ground; Frame or Chassis Ground
Table 2-4. Cylinder Position Sensor Requirements
Output Signal: Analog: 4–20 mA
Input Voltage: 15 V (dc) (power provided by VariStroke)
Linearity: ±0.04% Full Stroke
Current Drain: <100 mA
Sensor Length:
≤
2 times the Cylinder Stroke Length
Update Rate:
≤
1 ms
Sensor Cable Length Limit: 10 m (32.8 feet) maximum between sensor and VariStroke
Slower update rates than the one shown in the above requirements
could result in excessive limit cycle, wear, and poor position
accuracy.
It is for this reason that Woodward does NOT recommend using a
combination of LVDTs and Signal Conditioners. This combination
will typically result in unacceptable delays in the position sensor
update rate.
Woodward recommends that the installer consider
Magnetostrictive position sensors and/or DCDTs.
Released
