6
VA-8051 Product Bulletin
Fig. 6: DSC-8500 Application Wiring
(Incremental Control with Position Indication or Proportional Control)
Controls Group
507 E. Michigan StreetP.O. Box 423
Printed in U.S.A.
Milwaukee, WI 53202
Page 1: ...tops the motor Field calibration of the force sensor is not required The actuator maintains the shutoff force even if power to the controller is lost When the controller signals the valve to move in the opposite direction the shutoff force will be reduced and the valve will modulate The internal position feedback potentiometer is connected to the R W and S terminals Specifically the wiper is conne...
Page 2: ... 8051 Product Bulletin Wiring All wiring must be in accordance with applicable electrical code requirements Input lines to the actuator must be wired correctly for the valve to move in the proper direction ...
Page 3: ...ves compress the spring with hand pressure e Using a 9 16 in box head wrench unscrew the stem extension Lift the spring and upper spring plate off the valve Remove the spring compression tool if used f Thread the lower spring plate up the centerpiece stuffing box to increase spacing between the spring plate and the flat valve yoke mounting surface 2 Unpack the actuator and make sure the lever plat...
Page 4: ...n fully up to hold tension on the stem and coupler thread the Palnut up the stem until it contacts the coupler Tighten Palnut to coupler with 1 2 in and 7 16 in wrenches 10 Secure the actuator in place by tightening the spring plate with a large screwdriver See Fig 3 11 Drive the actuator fully up and down at least three complete cycles before again checking that the lever and its drive coupler st...
Page 5: ...Information Field repairs must not be made For a replacement VA 8051 contact the nearest Johnson Controls branch office Application and Drawing Identification Fig 3 Isometric Drawing Fig 4 VA 8051 1 Dimensions in mm Fig 5 Internal View ...
Page 6: ...051 Product Bulletin Fig 6 DSC 8500 Application Wiring Incremental Control with Position Indication or Proportional Control Controls Group 507 E Michigan Street P O Box 423 Printed in U S A Milwaukee WI 53202 ...
