Dynalco SW-200B User Manual

Installation and Calibration Instructions

SW-200B Speed Switch

1. Installation: Mount the SW-200B to a secure bracket off the engine. If

on-engine mounting is necessary , shock mounts are recommended. Wire
according to connection diagram on reverse. Shielded cable is
recommended. Shield should be brought to ground directly . The SW-200B
will work with most magnetic pickups provided the signal amplitude is
greater than 50 mVrms and less than 70 V rms. Mount pickup according
to manufacturer’s instructions.

2. Calibration: Determine the setpoint frequencies from an RPM value
using the following formula:

Frequency =

A. Verify the current calibration: use a signal generator . Connect it to the

SW-200B magnetic pickup input.

B. Confirm the DIP switches are properly set for the frequency range and

overspeed relay logic desired. (See chart below.)

C. Set the signal generator output to at least 10% below the lowest setpoint.

Slowly increase the frequency. Using an ohmmeter across the relay
contacts, determine the frequency at which each relay changes state.

a. Change a setpoint: remove the appropriate access hole screw to reach

the setpoint's relay adjustment trim pot.

b. Set the signal generator to the frequency at which the relay should change

state. Connect it to the SW-200B magnetic pickup input.

c. Using a small, flat screwdriver, adjust the trim pot for the appropriate

relay until the relay changes state.

d. Decrease the frequency, then slowly increase it to verify that the relay

trips at the appropriate point.

RPM x No. of Teeth (Holes)

60

Replace the access hole screw

.

DIP SWITCH SETTINGS

Switches 1 & 2 set the

full-scale frequency range

DIP

SW 1

OFF OFF = 0 – 11,200 Hz ON N/A =

OFF ON = 0 – 5,000 Hz OFF N/A =

ON ON = 0 – 1,000 Hz N/A ON = Latches

DYNALCO CONTROLS RESERVES THE RIGHT TO CHANGE THESE SPECIFICATIONS WITHOUT NOTICE.

(



© 2002 Azonix-Dynalco 145F-12044, Rev 0

DIP

SW 2

Azonix-Dynalco, 3690 N.W. 53rd Street, Fort Lauderdale, FL 33309 U.S.A.

954) 739-4300 • Fax [phone] • www.dynalco.com • [e-mail]

Full-Scale

Range

SW-200B is a trademark of Dynalco Controls

Switches 3 & 4 set the

overspeed relay logic

DIP

SW 3

N/A OFF =

DIP

SW 4

Relay
Logic

Energizes

Above

Setpoint

De-Energize

Above

Setpoint

Does not

Latch

CONNECTION DRAWINGS

SW-200B