Timpdon Electronics GPRX7 Quick Start Manual page 5

Operation Timing Diagram
Timpdon Electronics Tel: 0161 980 7804 Issue 1 — February 2018
www.timpdon.co.uk
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Mount the servo so that the point operating linkage will be
approximately at 90° to the straight track when in use. At this
stage, do not connect the operating linkage to the servo.
Connect the servo to the GPRX7. Power up and bind the GPRX7
to the transmitter.
The factory default settings for the GPRX7, as shipped, are:
Reset Servo PWM = 1.50 ms
•
Set Servo PWM = 1.55 ms
•
Set the GPTX10 transmitter for normal operation. Select the
appropriate point number, and press and release the
transmitter Reset switch.
The servo will take up the factory default position, corresponding
to a servo PWM pulse width of 1.50 ms — i.e. central.
Fit the servo arm to the servo so that it is parallel to the
straight track.
Now press and release the transmitter Set switch, and check that
the servo arm rotates approximately 10°. Do not worry if the
servo rotation direction is opposite to that required. This will be
corrected during calibration.
Return the servo to its Reset position using the transmitter
Reset switch. Fit the operating linkage between the point and the
servo, and adjust its length so that the point blades are roughly
midway between the set and reset position, with the servo arm
positioned as described in Step 3.
This completes the mechanical set up procedure. You may now
proceed to calibrate the GPRX7 for final Set and Reset positions
for the point. All servo calibration is performed from the
transmitter. Refer to the GPTX10 user manual for detailed
instructions.
You may wish to experiment with calibration before fitting the
point operating linkage described in Step 5, in order to familiarise
yourself with the procedure, without risking damaging the servo
by accidental mis-setting.
Tel: 0161 980 7804
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[central]
[rotation angle =
approx. 10°]
Issue 1 — February 2018
Page 5 of 12