Badger Meter SRD/SRI Valve Positioners - Manual (Page 66)

Setting the Travel Indicator
The mechanical travel indicator is coupled to the feedback shaft of the positioner by a gear The gear has two selectable
ratios 1) 1 : 2 and 1 : 6
1) The values are rounded for making easier calculations The exact ratios are 1 : 1 83 and 1 : 6 28
Selecting Gear Ratio
For rotation angles of the feedback shaft less than 30° select a ratio 1 : 6 This gear selection amplifies the feedback shaft
rotation angle six times and for example, a 20° angle is shown as 120°
For rotation angles greater than 30° select a ratio of 1 : 2 This gear selection amplifies the shaft rotation angle by a factor of
two and for example, a 45° angle is shown as 90°
For rotary actuators the rotation angle is equal to the rotation angle of the actuator Consequently, a 90° rotation angle will
result in a 180° display angle for the 1 : 2 gear ratio
For linear actuators the rotation angle is determined by travel span and feedback lever length In this case, an exact 180°
display angle can only be achieved for a 30° rotation angle using a 1 : 6 gear ratio If any other rotation angle results, either the
closed or full open position can be set to be indicated at, for example 0° or 180° However, if the closed position is chosen for
display, then the full open display position angle is dependent on travel span, feedback lever length and gear ratio If the full
open position is chosen for display, then the closed position angle becomes dependent
Setting Gear Ratio
Remove the travel indicator 12 Pull out the pin 12b for a ratio 1 : 2 or push in the pin for a ratio 1 : 6 Use a smooth turning
operation to free the gears and to set the pin 12b against the stop See illustration
Figure 23:
Turn the travel indicator 12 to the desired position, put it on the gear shaft against the stop and pinch the wire ring for
secure coupling
DECOMMISSIONING
Before decommissioning the unit, disconnect the supply air and the electrical input signal
After disconnecting the electrical input signal the last confirmed configuration of the positioner is preserved in the memory
Exchange of Device
If a temporary decommissioning of the SRD and a later mounting to another actuator has to be carried out, before
disconnecting, we recommend to Reset Configuration in Menu 9 1 So the default settings ”Ex-Factory” are reactivated This
facilitates a later recommissioning
Decommissioning
Page 66 August 2014 POS-UM-00010-EN-03