WEBTEC VFD120MD Series Manuale utente
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Introduction
The VFD120 Motor-Driven remote control flow divider is ideally suited for the agricultural and industrial user seeking a
cost effective method of controlling hydraulic motor speed. The priority flow port gives an output independent of load
pressure while the By-Pass port can be used to power a secondary circuit.
Webtec have been designing and manufacturing flow meters and hydraulics components for over 40 years. We operate
within a Quality Management System that complies with the requirements of BS EN ISO 9001 which is externally
audited and certificated each year. Beyond compliance to the standard, Webtec is committed to continually improving
in everything we do; with particular emphasis on understanding what matters to our customers and suppliers, and
designing our systems and work to meet their needs. We are always keen to hear from customer who may have special
requirements not covered by our standard ranges.
Features
•Reliability
•All connections made via M12 connector
•IP66 certified (with cable connected)
•Intelligent design – power failure detection, high current detection, broken demand signal detection.
•No external control box needed. All electronics are self-contained inside the canister.
•Minimum to maximum priority flow in less than 10 seconds (at full pressure)
•11 – 28 Vdc supply enables unit to be powered from a vehicle supply
•Choice of remote control options: Potentiometer, 0.5–5 Vdc, 4–20 mA loop
•Set and Forget
•Up to 420 bar (6000 PSI) maximum working pressure.
•Pressure compensated permitting both ‘priority’ and ‘By-Pass’ flow to be used simultaneously at varying pressures
without affecting the ‘priority’ flow rate
•Stability of Flow
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Ordering Codes Typical Code VFD120MD 120 J P
Valve Type (Motor Driven)
Regulated Flow Capacity (Table 1)
Porting (Table 2)
Control (Table 3)
Table 3: Control
Code Control
P Potentiometer
5V 0.5 – 5 VDC
mA 4 – 20 mA
Code Port Threads Inlet Regulated
Flow and Excess Flow
H 1/2” BSPP
J 3/4” BSPP
G 1–1/16” -12UN #12 SAE ORB
A 3/4” NPTF2
M M22 x 1.5
Table 2: Porting1
Table 1: Regulated Flow (gpm refers to US gpm)
Note: M22 and 1/2” BSPP threads only available in flow codes
050 to 120
1Other threads available to special order
2All NPTF threads are to ANSI B1.20.3 -1976 Class 1. As stated
in the standard it is recommended that “sealing is accomplished
by the means of a sealant applied to the thread”. NPT fittings
may also be used to connect to NPTF ports (also with a sealant
applied to the thread)
Code Regulated Flow
050 0* - 19 lpm (5.0 gpm)
080 0* - 30 lpm (8.0 gpm)
120 0* - 45 lpm (12.0 gpm)
160 0.5* - 60 lpm (16.0 gpm)
200 0.5* - 76 lpm (20.0 gpm)
250 1* - 95 lpm (25.0 gpm)
300 1.5* - 110 lpm (30.0 gpm)
* ± 0.5 lpm
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Specifications
Maximum pressure: 420 bar (6000 psi)
Input and Regulated flow capacity: Input up to 120 lpm (32 US gpm) and regulated from 0.5 lpm (0.132 US gpm) up
to 110 lpm (30.0 US gpm aprox) dependent on model
Material: Steel components in a cast Ductile iron body. Drive mechanism mounted on
aluminium supports
Weight: 2.75 kg
This equipment is intended for use within industrial and residential environments and does not suffer any degradation
in performance when subjected to test conditions according to EMC directive BS EN 61326-1:2013 emission (group 1,
class B) and interference immunity (industrial environment).
Valve Assembly Fitting
The installation of this valve and associated control components should only be undertaken by suitably qualified
personnel.
•Securely mount the valve in position with the bolt holes provided in the body.
•Make all hydraulic connections to the valve with flexible hose at least 100mm long. Hoses should be clamped to
avoid lateral forces on the ports.
•Check IP (Ingres Protection) rating before installing in wet areas. Use a M12 cap to protect connector when no cable
is present. IP rating only applies if unit is fully connected.
•Use the information stated on ‘Electrical Connection Detail’ section as a guide to connect the M12 cable to the Power
Supply and the Control Signal.
•Connect M12 right angle female connector to the M12 connector fitted on the valve.
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Dimensions
Dimensions in millimetres [inch]
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Connection Details
Valve Connector Pin out (Plug viewed from top)
Pins
Potentiometer 4 - 20 mA 0.5 - 5 VDC
1 = +In 1 = +In 1 = +In
2 = Pot + 2 = N/C 2 = N/C
3 = 0 Vdc 3 = 0 Vdc/4-20mA - 3 = 0 Vdc
4 = Pot Wiper 4 = N/C 4 = 0.5 - 5Vdc IN
5 = Pot - 5 = 4-20mA + 5 = 0.5 - 5Vdc GND
N.B. N/C = Do not connect
Connecting cable (5m) with Potentiometer TSK6638-05
Connecting cable (5m) (4-20mA and 0.5 - 5V versions) TSK6635-05
Consult sales for other lengths
Power Requirements
11 - 28 VDC.
Current Consumption 1.5 Amp during move at maximum inlet flow and maximum pressure. Current when in standby
< 100mA. Place a 2A Fuse between the power source and the VFD120MD valve. The power source and the fuse are
not supplied.
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Typical Connections:
The connections shown are only a guidance. The unused wires should be cut and isolated.
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Operating Instructions
`
The valve assembly is setup at the factory and does not require any further adjustment. Contact the supplier if normal
operation does not start.
Potentiometer Control:
When the control knob is fully set anti-clockwise the priority flow will be at its minimum and when it is set fully
clockwise the priority flow will be at its maximum.
NB: If the demand potentiometer signal connection is open circuit the valve will stay at the current flow.
0.5 - 5V & 4 - 20mA Demand Control:
When the input control signal is at minimum (0.5V, 4mA) the priority flow will be at its minimum, and at maximum (5V,
20mA) the priority flow will be at its maximum.
If the valve does not work as expected check power and demand control connections.
IMPORTANT!
DO NOT REMOVE THE CANISTER.
This device does not have user-serviceable parts or user-adjustable settings.
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