Metrix 5550 Installation Manual

Doc# M8905 • REV R (May 2016) Page 4 of 8
SETPOINT ADJUSTMENT
The setpoint is adjusted by means of a set screw, accessible on the switch’s cover. This set
screw makes very small changes to the angle of the internal tension spring, thereby increas-
ing or decreasing the seismic acceleraon level required to trip the device. The set screw
can be adjusted over a range of approximately 2 full turns (16 g’s peak); a 1/8th turn of this
set screw represents approximately 1g and is considered the smallest adjustment for which
repeatable results can be obtained. Turn the screw clockwise to increase the setpoint; turn
counter-clockwise to decrease the setpoint.
The switch orientaon is dened as the direcon in which the top of the reset plunger faces.
The switch ships from the factory with the setpoint at approximately 2g with the switch
oriented in the upward vercal posion, and 1g when oriented in the horizontal posion.
The factory default setpoint is not meant to be indicave of allowable vibraon on any
parcular machine or applicaon. It is the responsibility of the user to determine the allow-
able vibraon levels for their machine and adjust the setpoint accordingly. Refer to Metrix
5550 & 5550G User Guide / Installaon Manual (doc 1231558) for addional step-by-step
guidance on establishing and adjusng the setpoint for your machinery. The manual can be
downloaded from www.metrixvibraon.com.
REMOTE RESET AND STARTUP LOCKOUT
All Model 5550 Mechanical Switches can be reset locally using the manual reset plunger.
Addionally, those ed with the oponal electrical reset circuit can be remotely actuated.
The remote reset mechanism consists of an electrical solenoid in series with a thermistor. To
reset the switch remotely, apply the rated voltage (see nameplate) to the reset circuit ter-
minals momentarily. This will energize the solenoid and push the trip plate from its tripped
posion back to its untripped posion.
Some machines exhibit elevated vibraon during startup, above the established trip setpoint
for normal operaon. To accommodate these situaons, the same circuit may also be used
to provide a trip lockout during machine startup. Where vibraon above the normal trip
setpoint may be present temporarily as the machine runs through and it would be other-
wise impossible to start the machine without tripping. To use the startup lockout feature,
apply the rated voltage to the reset terminals connuously. This will energize the solenoid
connuously and keep the switch in its untripped posion. The lockout will persist for 30
seconds, or as long as voltage is connuously applied, whichever is shorter (the thermistor in
this circuit which will automacally de-energize the solenoid aer approximately 30 seconds
even if excitaon voltage persists at the reset terminals). If the voltage is applied connu-
ously rather than using an external mer or sequencer, please note that the voltage must be
removed from the reset circuit when the machine is stopped to allow the thermistor to cool
o. If this is not done, it will not be possible to reset the switch remotely.
NOTE: The setpoint is dependent on the switch’s physical orien-
taon. A switch facing upward, downward, and horizontally will
trip at three disnctly dierent acceleraon levels for the same
set screw adjustment. This is due to the force of gravity and how it will
either aid or oppose the relave ease of trip plate moon, depending
on switch orientaon. For this reason, establish the desired setpoint
only when the switch is in its nal mounted posion.

Metrix 5550 Specifications

General

Brand	Metrix
Model	5550
Category	Switch
Language	English