Pulsafeeder Pulsar DLC - Manual (Page 96)

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18. The Tachometer or Target gear may be damaged. Rotate the pump motor 360 degrees and count the
number of transitions from high to low that you observe on your multi-meter.
19. If you do not count exactly 24 high interspersed with 24 low levels, the Tachometer target gear is
damaged. .
20. Test your settings. Turn off and lock-out the power to the DLC at the main panel.
21. Reconnect all conduit fittings to the Tachometer if removed in a previous step.
22. Remove the multi-meter
23. Connect the motor power to J3 on the Field Wiring Board (refer to Figure 4: High Voltage
Connections).
24. Replace the Wiring Access cover (refer to Figure 2: Accessing the Field Wiring Board).
25. Turn ON the power to the DLC at the main panel.
26. Press [MOTOR] to start the motor.
27. Verify that strokes are being counted, if not contact Technical Services.
11.1.3 Tachometer Upgrade Adjustment Instructions
The new Pulsar DLC/DLCM controllers are equipped with upgraded tachometer circuitry which increases
the accuracy of the unit and decreases the possibility of errors in the future. When this new circuit replaces
the older tachometer circuit, there is an adjustment procedure that must be followed to insure proper
operation of the tachometer circuit.
1.
Install the DLC/DLCM controller on your pump as per the instructions in the Pulsar IOM
(Installation, Operation and Maintenance) Manual.
2. Secure and carefully check all wiring connections to and from the DLC/DLCM.
3. Power up the DLC/DLCM.
4. Note the following terminals: J5-8 signal ground (VDC -)
J10-1 voltage output (12 VDC +)
J10-2 tachometer signal (VDC variable +)
5. Measure voltage between J5-8 and J10-1, should read 12 VDC.
6. Remove the top cover of your drive motor so that you can access the motor shaft.
7. Measure the voltage between terminals J5-8 and J10-2, and rotate the motor shaft until you have
the lowest voltage reading.
8. Loosen the locknut on the tachometer body, and adjust the position of the tachometer sensor until
the voltage reads 1.0 VDC.
9. Rotate the motor shaft again, and observe the voltage, the highest voltage observed should be 5.5 –
6.0 VDC.
10. As the motor shaft is rotated, the voltage should vary between 1.0 and 5.5 to 6.0 VDC.
11. Make necessary adjustments to achieve this range, then tighten the locknut on the tachometer body.
12. Secure all wiring, replace all covers, and prepare the pump for operation as per your normal
procedures.