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Doc# 1231558 • REV C (November 2017) Page 14 of 20

NOTE: The objecve is to establish a setpoint as close as possible to

normal operang condions, while sll allowing normal uctuaons

in speed, load, ow, etc. without false trips. Establishing a setpoint

that is too high may render machinery protecon ineecve. DO NOT at

this me aempt to adjust the setpoint for high vibraon encountered

during machine startup. This will be addressed in step 4.2.11.

taking appropriate cauons around any wiring that is (or may become) energized during

machine starng sequences and the setpoint adjustment procedure.

4.2.3 Reset the switch by depressing the reset plunger (5550) or manually pushing the

exposed trip plate into its untripped posion (5550G).

4.2.4 Connect a connuity tester or ohmmeter across COM & NOM OPEN terminals

(refer to Figure 10). This will allow you to visually conrm when the normally open relay

contacts close, indicang the switch has tripped. This is also true for COM & NOM CLOSE,

the normally closed relays contacts open when tripped.

4.2.5 Hold the reset plunger (5550) or trip plate (5550G) down and start the machine.

When the machine has reached running speed, release the plunger (5550) or trip plate

(5550G).

4.2.6 If the switch trips when releasing the plunger/trip plate, rotate the setpoint screw

a full turn (360 degrees) CW and then depress the plunger/trip plate, holding it in the

untripped posion. Release the plunger/trip plate once again and watch to see if the

switch trips. Repeat this process unl the switch does not trip with the machine running

at normal operang speed. Then, proceed to step 4.2.7.

4.2.7 With the machine running, SLOWLY turn the setpoint adjustment screw CCW unl

the switch trips. Then, turn the screw in the opposite direcon (CW) 1/8th turn, or ac-

cording to OEM instrucons, and reset the switch.

4.2.8 Allow the machine to run for as long as necessary to ensure the switch does not

trip under normal speed, load, and other operang condion changes. If the switch does

not trip, proceed to step 4.2.10. If it trips, proceed to step 4.2.9.

4.2.9 (Perform this step only if the switch tripped in step 4.2.8.) Turn the setpoint

adjustment screw in the CW direcon (increasing setpoint) in the smallest increment pos-

sible – preferably 1/16th turn or less, or according to OEM instrucons. Reset the switch

and repeat step 4.2.8.

NOTE: This step accomplishes two objecves. First, it allows the in-

staller to easily ascertain when the switch has snapped from its un-

tripped state to its tripped state, as it may be dicult or impossible

to listen for an audible “click” in the presence of ambient machine noise.

Second, it allows appropriate setpoint adjustments to be made without

unnecessary trips of the machine (repeated starts/stops on a machine are

usually undesirable and may be electrically and/or mechanically damaging

in some circumstances).

Metrix 5550 User Manual

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