Johnson Controls VA-77 Series User manual
PB_VA-7700_Electricl Valve Actuators_02 2011
■■Self■adjusting■proportional■actuators■
Easy, quick and precise commissioning servicing
■■Column■of■5■Light■Emitting■Diodes
Allows easy visualisation of actuator stroke position and of the actuator status
■■Optional■models■with■mechanical■manual■override
Allows manual positioning independent of the power supply
■■Manual■contact■micro■switch■on■all■models■with■manual■override
Signals actuator mode status (automatic or manual) to external supervisory system.
■■IP54■protection■class
Allows installation in a wide range of environments
■■Unique■“C”■shaped■yoke■design
Allows lateral mounting of the actuator reducing the vertical space over the valve needed for
installation.
■■Positioner■with■selectable■starting■point■and■span,■direct■and■reverse■action■modes
Enables sequence control
■■Magnetic■clutch
Provides constant output force for close-off of valves, and protects motor in stall conditions
■ “Control-Signal■failure■”■stem■to■pre-determined■position
Actuator pre-set position after a control signal failure (extended/retracted), is selectable in-situ
The VA-77xx Series synchronous motor driven actuator, for
valves in heating, ventilation and air conditioning applications,
is available for floating (3-point) control or proportional control
with 0-10 V position feedback signal.
It provides a stroke capability of 8 mm to a maximum 20 mm.
This compact, non spring return actuator has a 500 N nominal
force and responds to a variety of input signals.
The actuator can be combined with VG7000, VG9000
and VGS8… valves in accordance with the maximum
close-off pressure ratings specified (see pertinent valve
product bulletins).
They can be ordered as a separate unit or as a factory fitted
valve / actuator combination.
VA-7700■Series
Electric■Valve■Actuators
2
PB_VA-7700_Electricl Valve Actuators_02 2011
Ordering■Codes
For■VG7000■and■VG9000■Series■Valves: For■VGS8…■Series■Valves:
Device■code Power■supply Manual■override Device■code Power■supply Manual■override
Floating■models■(3-point) Floating■models■(3-point)
VA-7700-1001 24 VAC None VA-7700-8201 24 VAC None
VA-7700-1003 230 VAC None VA-7700-8203 230 VAC None
VA-7740-1001 24 VAC Mechanical VA-7740-8201 24 VAC Mechanical
VA-7740-1003 230 VAC Mechanical VA-7740-8203 230 VAC Mechanical
Proportional■models■(0…10■VDC■/■0■(4)…20mA) Proportional■models■(0…10■VDC■/■0■(4)…20mA)
VA-7706-1001 24 VAC Electrical VA-7706-8201 24 VAC Electrical
VA-7746-1001 24 VAC Electrical and
Mechanical
VA-7746-8201 24 VAC Electrical and
Mechanical
These actuators can be combined with the following valve
ranges:
•■ VG7000■Series■Threaded■Valves
Female and male threaded valves
These actuators can be combined with the following valve
ranges:
•■ VGS8...■Series■Male■Threaded■Valves
Male threaded valves
VG7■■T all■body■types■DN■15...50 VGS8■■W1N 3-way■DN■15...■40
2-Way■DN■15...■50
•■ VG9000■Series■Flanged■Valves
Flanged valves
VG9■■S1■ all■body■types■DN■15...50
Ordering■procedure
The actuator can be ordered as a separate unit or a factory fitted
valve-actuator combination. Should the latter be requested,
please just add “+M” to the end of the actuator ordering code.
For■Example:
Item 1 VG7203NT (valve body)
Item 2 VA-7746-1001 (actuator)
Alternatively, to order a factory fitted combination
Item 1 VG7203NT (valve body)
Item 2 VA-7746-1001+M (actuator)
3
PB_VA-7700_Electricl Valve Actuators_02 2011
Operation
Floating■models■
Connections Actuator■Stem
1-2 Extends
1-3 Retracts
Proportional■models■
(0…10■VDC■or■0(4)…20■mA)
The VA-77x6 provides a proportional stroke corresponding to the
control signal.
Following control signals are defined as standard:
0…10 VDC
0…5 VDC
5…10 VDC
0…20 mA
4…20 mA
Action■
(DIP■switch■set)
Input■
control■
signal
Actuator■
Stem
Position■at■
control-signal■
failure■*
Direct■(DA) Increases
Decreases
Extends
Retracts
Selectable*
Selectable*
Reverse■(RA) Increases
Decreases
Retracts
Extends
Selectable*
Selectable*
* "Signal failure" position pre-set does not operate when 0…20
mA control is selected.
The action mode, DA (direct acting) and RA (reverse acting)
is set through the DIP switches (see paragraph "DIP switch
settings").
The actuator control signal has a buffer zone, at each end of the
span, of 0.3 V or 0.3 mA.
This ensures definite valve close-off.
Control■signal■failure■pre-set■position■
(not functional with 0…20 mA control selected)
A control-signal failure on proportional models will cause the
actuator to automatically move the stem to a (via DIP-switches)
pre-selected position (100% extended or 100% retracted).
Auto■Calibration■procedure■with■standard■
input■signal■ranges.
The standard control signals are selected by setting DIP switches
3 and 4 switch (see paragraph "DIP switch settings").
It is recommended to set the actuator to the desired control signal
and action before fitting to the valve (see paragraph "DIP switch
settings").
Power must be connected before the auto-calibration cycle can
be started.
Procedure:■Actuator■is■mounted■on■valve.
• Verify that with the stem fully retracted, there is a minimum
distance of 1 mm between the top of the actuator stem nut and
the stem guide bush in the actuator motor housing base plate.
If necessary correct the distance by adjusting the actuator /
valve stem connection.
• To start the auto calibration cycle, push both calibration buttons
for at least 5 seconds. The actuator will make a full cycle to
detect the stem extended and retracted limits.
• When the auto calibration cycle is completed the LED
stop flashing, the actuator stem moves to the position that
corresponds to the control signal and the five LED indicate the
stem position.
• When the control signal changes the actuator stem moves to
the new position this is indicated by one flashing LED. The LED
stops flashing when the position corresponding to the control
signal has been reached.
Note: When ever the actuator is newly placed on a valve,
auto-calibration must be carried out.
Calibration buttons
> 5 sec
During auto-calibration cycle all five
status indication LED flash simultaneusly
4
PB_VA-7700_Electricl Valve Actuators_02 2011
Auto-calibration■procedure■for■freely■dened■
control■signal■ranges■
Non standard control signals for example 2…8 VDC are applied
by setting the DIP switches 3 and 4 (see paragraph "DIP switch
settings").
It is recommended to set the actuator to the desired control-signal
type and action before fitting to valve (see paragraph "DIP switch
settings").
Power must be connected before the auto-calibration cycle can
be started. It is recommended that the signal span is always
set superior or equal to 3V or 6 mA in order to keep acceptable
proportional characteristics.
Procedure:■(Actuator■is■mounted■on■valve)
• Verify that with the stem fully retracted, there is a minimum
distance of 1 mm between the top of the actuator stem nut and
the stem guide bush in the actuator motor housing base plate.
If necessary correct the distance by adjusting the actuator /
valve stem connection.
• The auto calibration cycle is started by pushing both calibration
buttons, on the pcb, simultaneously for at least 5 seconds.
The actuator will then make a full cycle to detect the stem
extended and retracted limits.
• Apply one of the control signal values and■confirm■by■
pressing■one■of■the■two■calibration■buttons■for■2■seconds■
(the■5■LED■will■illuminate■for■5■sec■to■confirm■the■setting).
Now apply the second control signal value and again confirm■
by■pressing■one■of■the■two■calibration■buttons■for■2■
seconds■(the■5■LED■will■illuminate■for■5■sec■to■confirm■the■
setting).
• Both the minimum and the maximum control signal values are
stored in the memory of the actuator.
• When the auto calibration cycle is completed the LED
stop flashing, the actuator stem moves to the position that
corresponds to the control signal and the five LED indicate the
stem position.
• When the control signal changes the actuator stem moves to
the new position this is indicated by one flashing LED. The LED
stops flashing when the position corresponding to the control
signal has been reached.
Position■feedback
The position feedback signal is for monitoring the actuator stroke
position. It feeds information internally to the positioner and a
0-10 VDC signal can supply an external supervisory system.
Electrical■manual■override
To select electrical manual override DIP switch 7 must be
switched to “on” (right hand position; see paragraph "DIP
switch settings"). The actuator stem can now be driven via the
calibration buttons. The upper button retracts the stem and the
lower button extends the stem. The stem remains in the position
at which the button is released. Switch DIP switch 7 to “off” to
return to automatic drive. The five LED indicate the stem position.
Mechanical■manual■override
To select manual override turn the override knob from “AUT” to
“MAN”, the hand wheel is then engaged and power disconnected
internally. Turning the hand wheel clockwise extends the stem
and anti-clockwise retracts the stem. Turning the override knob to
AUT disengages the hand wheel and reconnects the power.
WARNING:■The■auxiliary■switches■(terminals■
10,■11,■and■12)■can■be■used■to■indicate■manual■
override■or■automatic■mode.
Calibration buttons
> 5 sec
During auto-calibration cycle all five
status indication LED flash simultaneusly
5
PB_VA-7700_Electricl Valve Actuators_02 2011
1, 2:
Control signal Type
1
VDC
1
mA Default■setting■from■factory:
All switches in left hand position
22
3, 4, 5:
Control signal Ranges
30...10
VDC
---
1.
Voltage control
42.
3
0...5 VDC
3.
0...10 VDC
44.
35...10
VDC
---
5. ---
46. Direct Acting mode
3Free
Range
7. Electrical manual override "off"
48. "Signal failure position" pre-set = "Up"
---
50...20 mA
54...20 mA
6: Action 6 DA 6 RA
7: Electrical Manual Override 7 OFF 7 ON
8: Control signal failure
position preset* 8 Up 8
Down
* Does not operate with mA control.
DIP■switches■settings■(Proportional models only)
The DIP switches are accessed by removing the transparent cover.
6
PB_VA-7700_Electricl Valve Actuators_02 2011
Standard■operating■mode
The LED display indicates the actuator stem position.
The LED stops flashing when the position corresponding to the
control signal has been reached.
Actuator stem moving
between 40 to 60% of stroke
Actuator stopped
between 40 to 60% of stroke
Actuator■status■indication■■
(Proportional models only)
The actuator microprocessor carries out a failure diagnosis when
a failure has been detected.
The actuator status is indicated by the LED display.
LED■definition
LED permanently ON
LED flashing
LED permanently OFF
When the micro processor detects that the stem has come to an
unexpected stop it initiates a retry cycle, this is repeated three
times and if unsuccessful the actuator status is switched to fault■
mode and the LED indicate a general alarm code. If the problem
is cleared however, the actuator continues normal function.
Fault■mode
If the actuator enters fault mode, the LED will flash as shown.
The indication is general and is displayed when:
• Stem comes to unexpected stop; retry cycle fails
to clear problem
• Freely defined control-signal settings are
incomplete or not stored.
• Invalid E2PROM parameters
Specic■fault■indication
To indicate the specific fault press one of the calibration buttons
for 2■seconds. A fault diagnosis is displayed:
Specic■alarm■codes■displayed■by■LED
A B C D
Diagnosis
ACalibration interrupted before completion or values missing
BInvalid E2PROM parameters
CActuator stalled due to valve blockage
DDefault E2PROM parameters defective
When the problem has been solved, pressing one of the■
calibration■buttons for at least 5 seconds will cause the actuator
to leave the fault mode and the LED will show present actuator
status. Standard operating mode.
7
PB_VA-7700_Electricl Valve Actuators_02 2011
Actuators■without■built-in■positioner■for■
controllers■with■PAT■(Positioning■Adjusting■
Time)■output■in■parallel■operation
Although synchronous motors have the same running speed
(rate of travel), deviation in travel between motors can
accumulate during starts and stops because of varying loads.
This deviation depends on the number of on/off cycles.
By periodical switching of the actuators to end of travel,
actuators running in parallel can be reasonably synchronous.
The number of actuators that can be linked to a single controller
depends on the controller’s active power in relation to the
actuators power consumption.
Actuators■with■built-in■positioner■for■
controllers■with■0…10V■output■in■parallel■
operation
The controller 0…10 V output can operate several actuators with
built-in electronic positioner.
The number of actuators that can be linked to a single controller
depends on the controller’s active power in relation to the
actuators power consumption.
Each positioner has its own adjustment for starting point between
0…10 V.
Each actuator can have a different input (for instance 0…5 VDC /
5...10 VDC).
Each positioner can be switched for direct or reverse action.
DIP■switch■setting
Starting■
Point
End■Point■■
(Starting■Point■+■Span) Positioner■Action
Y1 0.3 V 9.7 V DA Factory Setting
Y2 5.3 V 9.7 V RA
Y3 6.0 V 8.0 V DA
Control■signal■(VDC)
Applications:■Parallel■and■sequential■operation
24Vac
Com
24Vac
Up
24Vac
Down
2
4Vac Com
2
4Vac Up
2
4Vac Down
1 2 3 1 2 3 1 2 3
Actuator 1 Actuator 2 Actuator 3
12 3 4
24VAC 24V
Com Com 0...10V
24 VAC
Com
0...10 V
0...10 V
24 VAC Com
12 3 4 12 3 4
Actuator 1 Actuator 2 Actuator 3
M
0%
50%
100%
012 3 4 5 67 8 9 10
Y1 Y2
Y3
8
PB_VA-7700_Electricl Valve Actuators_02 2011
Mounting■instructions
When mounting the actuator on a valve, please follow the
instructions below:
• It is recommended that the valves be mounted upright or at
angles not greater than 90° in an easily accessible location.
• The actuator must be protected against dripping water, which
could enter the housing and damage the mechanism or motor.
• Do not cover with insulating material.
• Sufficient clearance must be allowed for actuator removal (refer
to the dimension drawings).
• The valve must be installed so that the plug seats against the
flow, as indicated by the arrows on the valve.
WARNING:■These■actuators■are■intended■to■
control■equipment■under■normal■operating■
conditions.■Where■failure■or■malfunction■of■the■
actuator■could■lead■to■an■abnormal■operating■
condition■that■could■cause■personal■injury■or■
damage■to■the■equipment■or■other■property,■
other■devices■(limit■or■safety■controls)■or■
systems■(alarm■or■supervisory■systems)■
intended■to■warn■of■or■protect■against■failure■
or■malfunction■of■the■actuator■must■be■
incorporated■into■and■maintained■as■part■of■the■
control■system.
Wiring■instructions
• All wiring must be in accordance with local regulations
and national electrical codes and should be carried out by
authorised personnel only.
• Make sure that the line power supply is in accordance with the
power supply specified on the device.
• See also the instructions in paragraph “Application”.
WARNING:■■
Shock■Hazard
• Disconnect■the■power■supply■before■wiring■
connections■are■made■to■prevent■personal■
injury.
Equipment■Damage■Hazard
• Make■and■check■all■wiring■connections■before■
applying■power■to■the■system.■Short■circuited■
or■improperly■connected■wires■may■result■in■
permanent■damage■to■the■unit.
9
PB_VA-7700_Electricl Valve Actuators_02 2011
VA-7740-xx01■-■Floating■models,■24■VAC■supply
VA-7740-xx03■-■Floating■models,■230■VAC■supply
VA-7746-xx01■-■Proportional■models,■24■VAC■supply
WARNING:■■
Equipment■Damage■Hazard
• On■24■V■models■with■manual■override,■it■is■not■
permitted■to■connect■voltages■greater■than■■
24■V■to■terminals■10,■11,■and■12
Wiring■Diagrams■(Models with mechanical manual override)
Com
Com
0...10V
DC
0...10V
DC
/0...20mA
10
PB_VA-7700_Electricl Valve Actuators_02 2011
VA-7700-xx01■-■Floating■models,■24■VAC■supply
VA-7700-xx03■-■■Floating■models,■230■VAC■supply
VA-7706-xx01■-■Proportional■models,■24■VAC■supply
Wiring■Diagrams (Models without mechanical manual override)
Com
Com
0...10VDC
0...10VDC
/0...20mA
This manual suits for next models
13
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