Plantronics DYNZ-600 Series Troubleshooting Procedure, Tripping At Wrong Rpm, 6.4.4, Uncontrolled

F-23371 Electronic Speed Switch Technical Manual Page 5

6.3.3Adjust the signal generator frequency to the desired SW1 set/trip point as specified or calculated in step 6.2.1.

6.3.4Slowly turn the SW1 setpoint potentiometer adjustment counterclockwise until the ohmmeter indicates an open circuit. This gives you the correct setpoint for SW1.

6.3.5Slowly increase the signal generator frequency until the ohmmeter connected to terminals 10 to 12 indicates an open circuit. Note the frequency and verify that it is correct for your SW1 set/trip point requirements. If set/trip point of SW1 is correct it is properly calibrated. If set/trip point is incorrect, go to step 6.2.3, 6.3.3 and 6.3.4 and calibrate unit.

7.1.2Check input signal from MPU on terminals 5 and 6 with an AC voltmeter — must be greater than 0.7 volts rms.

7.1.3Check wiring to speed switch.

7.2 TRIPPING AT WRONG RPM

7.2.1Check for proper trip point settings.

7.2.2See calibration section.

7.3RELAY DOES NOT FUNCTION 7.3.1 Check wiring to relays.

6.4CALIBRATION OR CHECKING PROCEDURE FOR OS-SW2 TRIP POINT

6.4.1 With no power applied to unit, connect an ohmmeter to terminals 7 and 9 (no other wires attached). The ohmmeter should indicate zero resistance (short circuit). This is the normally closed contact on relay OS-SW2.

6.4.2 Apply correct DC power to terminals 1 and 2 of speed switch. The ohmmeter should indicate zero

	Uncontrolled
resistance (short circuit) with the signal generator
frequency set below the OS-SW2 set/trip point;
therefore, it must not change states when power is
applied.

NOTE

If you are only checking calibration point, omit steps 6.4.3 and 6.4.4 and go to step 6.4.5.

6.4.3 Adjust the signal generat r frequency to the

desired OSSW2 set/trip point as specif ed or calculated in step 6.2.1.

6.4.4	Slowly turn the OS-SW2 potentiometer
counterclockwise until the ohmmeter indicates an
open	istorical
	circuit. This gives you the correct setpoint for
	H

6.4.5Slowly increaseForthe signal generator frequency until the ohmmeter connected to terminals 7 to 9 indicates zero resistance. Note the frequency and verify that it is correct for your OS-SW2 set/trip point

requirements. If set/trip point of OS-SW2 is correct, it is properly calibrated. If set/trip point is incorrect, go toOS-SW2.

step 6.2.3, 6.4.3 and 6.4.4 and calibrate unit.

7.3.2Check relay contacts for proper operation.

Document Only

Reference

– CAUTION –

As a safety measure, the engine should be equipped with an independent overspeed

shutdown device in the event of failure which

may render the governor inoperative.

7.0 TROUBLESHOOTING PROCEDURE

The unit is potted and, therefore, non-repairable, but the following checkpoints can be used to determine if there is an internal fault.

7.1 UNIT DOES NOT FUNCTION

7.1.1Check battery voltage on terminals 1 and 2. DYNZ-60010-000-0-40 — 8 to 40 Vdc DYNZ-60012-000-0-74 — 58 to 88 Vdc DYNZ-60013-000-0-40 — 8 to 40 Vdc

- NOTE -

Barber-Colman believes that all information provided herein is correct and reliable but reserves the right to update at any time. Barber- Colman does not assume any responsibility for its use unless otherwise expressly undertaken.

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