Johnson Controls VA-77 Series Product Bulletin

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
1
2 3 4
24VAC
24V
Com
Com 0...10V
24 VAC
Com
0...10 V
0...10 V
24 VAC Com
1
2 3 4
1
2 3 4
Actuator 1 Actuator 2 Actuator 3
M
0%
50%
100%
0
1
2 3 4 5
6
7 8 9 10
Y1
Y2
Y3

Johnson Controls VA-77 Series Specifications

General

Brand	Johnson Controls
Model	VA-77 Series
Category	Controller
Language	English