Plantronics DYNZ-600 Series Wiring Instructions, Operation and Calibration, Speed Switch

F-23371	Electronic Speed Switch Technical Manual		Page 3
• Barber-Colman sets the units to operate over the		5.1.4 When an overspeed condition occurs, OS-SW2
adjustment range of 325 to 10,000 Hz by cutting		relay deenergizes and latches up and will remain
jumper J2 only. The sensitivity of the adjustment		latched up until the POWER SWITCH is turned off or
potentiometer is approximately 480 Hz per turn.		power is somehow removed from the unit. The engine
n SW1 is factory set at 1100 Hz unless specified in		overspeed setpoint is normally adjusted to trip at 10 to
purchase order.		20% above the engine operating speed.

nOS-SW2 is factory set at 3600 Hz unless specified

in purchase order.	5.2 CALIBRATION PROCEDURE
• The unit can be operated at a lower frequency	Equipment Required: Signal generator
adjustment range (80 to 2500 Hz instead of 325 to	Frequency counter Ohmmeter
10,000 Hz) by reconnecting jumper J2 and cutting out
jumper J1 (see Figure 2).	5.2.1 Determine the desired trip points for your unit
	when using a magnetic pickup (MPU).

4.0 WIRING INSTRUCTIONS

No. of Gear Teeth x

The typical wiring diagram shows the wiring required

Trip Point in Hz = Engine RPM Trip Point

to properly connect the unit to the DYNA governor. All

60

the wiring for the test, tach and input power terminals

5.2.2 Connect the signal generator and counter to

should be either 18 or 20 AWG wire. The wiring to the

Document

relay contacts should be 16 AWG wire if the current

terminals 5 and 6 wi h terminal 5 being the ground

Only

requirement is less than 5 amperes and 14

terminal. Set the signal generator frequency 100 Hz

below the SW1 or OS-SW2 trip point you are trying

to

AWG if the current through the contacts is between 5

calibrate/set or check. Then adjust the out signal from

and 10 amperes. The current load and wiring to the

the signal generator to 1 volt rms or greater.

relay should be checked thoroughly.

Reference

NOTE

shown. It is good practice to isolate he power wiring

CAUTION

Omit/skip

step

5.2.3 if

you

are only checking the

If the 10 ampere relay contact rating is exceeded, the

calibration poi ts of the unit.

foil on the printed circuit board from the relay contacts

5.2.3 If you are calibrating unit, turn the desired trip

Uncontrolled

to the terminals can be damaged.

point potentiometer adjustment 10 or 15 turns

As shown in Figure 3, a two-conductor shielded cable

clockwise.

must be used for mounting the speed sensor (MPU)

5.3 CALIBRATION OR CHECKING PROCEDURE

to the unit. The shield should only be c nnected as

FOR SW1 TRIP POINT

istorical

from the relay contacts and associa ed relays from

5.3.1 With

no

power applied to unit, connect an

the input signal wiring. The input signal is norm

lly

ohmmeter

to terminals 10 and 12 (no other wires

from a magnetic

pickup (MPU) mounted on

the

attached).

The

ohmmeter

should indicate

zero

flywheel housing which senses the ring gear speed.

resistance (short circuit). This is the normally closed

5.0 OPERATION AND CALIBRATION OF

contact on relay SW1.

DYNZ-60010

H

5.3.2 Apply correct DC power to terminals 1 and 2 of

SPEED SWITCH

speed switch. The ohmmeter connected to terminals

10 to 12 should still indicate zero resistance, because

5.1 OPERATING PROCEDURE

For

you should be below the setpoint for SW1 and it

Once the system has been wired, the SPEED

SWITCH functions in the following manner.

should not change states when power is applied to

5.1.1 No power applied to unit.

the unit.

• SW1 and OS-SW2 relays are de-energized;

NOTE

therefore, contacts are in position as shown on top of

If you are only checking calibration point, omit steps

unit.

5.3.3 and 5.3.4 and go to step 5.3.5.

5.1.2 Power is applied to unit when POWER SWITCH

5.3.3 Adjust the signal generator frequency to the

is turned on and no input signal to speed switch.

desired SW1 set/trip point as specified or calculated

• SW1 relay remains de-energized; therefore,

its

in step 5.2.1.

contacts remain in same position as those shown on

5.3.4 Slowly adjust SW1 setpoint potentiometer

top of unit.

• OS-SW2 relay

energizes; therefore, its contacts

counterclock-wise until the ohmmeter indicates an

change states from those shown on top of unit.

open circuit. This is now the set/trip point for SW1.

5.1.3 When the engine is cranked and the engine

5.3.5 Slowly increase the signal generator frequency

starts, SW1 energizes at its crank-dropout setting

until the ohmmeter connected to terminals 10 to 12

which is normally adjusted midway between the

indicates an open circuit. Note the frequency and

cranking RPM and idle RPM of the engine.

verify that

it is

correct

for your SW1 set/trip

point

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