!1711 Townhurst DR., Houston, TX 77043-2899
Tel: 713-461-2131 Fax: 713-461-8223
M8905 05/02 ERO 8848
INSTALLATION OF METRIX MODEL 5550
MECHANICAL VIBRATION SWITCH
MW
SERIES
Thisbulletin should beused byexperienced personnel asa guide
to the installation of the Model 5550 vibration switch. Selection
or installation of equipment should always be accompanied by
competent technical assistance. We encourage you to contact
Metrix Instrument Co. or its local representative if further informa-
tion is required.
IMPORTANT: BEFORE PROCEEDING TO INSTALLAND WIRE
THE UNIT, READ AND THOROUGHLY UNDERSTAND THESE
INSTRUCTIONS.
THE SWITCH MODEL NUMBER SHOULD BE CHECKED TO
CONFIRM THAT YOU HAVE THE CORRECT HAZARDOUS
AREA RATING FOR YOURAPPLICATION. SEE HOW TO OR-
DER INFORMATION. "A"
INSTALLATION:
1) The sensitive axis of the vibration switch is perpendicular to
the mounting base. The preferred mounting is with the sensitive
axis in the horizontal plane, since most machines vibrate more in
that plane. Mount the switch solidly to the frame of the machine.
2) Remove the cover and wire the switch(es) into the alarm or
shutdown circuit. Do not exceed switch contact ratings listed in
the specifications. Keep field wiring away from the moving
part of the mechanism.
3) Observe all local electrical codes.
SETPOINT ADJUSTMENT:
1)Thevibrationsetpoint adjustment isaccessibleexternally. Turn-
ing the setpoint adjustment clockwise (CW) increases the vibra-
tion setpoint.
2) When the switch is shipped from the factory, the setpoint ad-
justment is set to 2g when installed in the vertical position and 1g
when installed in the horizontal position (with reference to the
setpoint adjustment shaft).
3)Tocheck factorycalibration, place unmounted unit in your hand
and rotate per diagram D. The switch(es) should activate at dead
bottom position. If necessary, adjust setpoint using the setpoint
adjustment screw.
4) To preset switch at other than factory setpoint, start with step
three (3) and then rotate adjustment screw 1/8 turn per g until
you reach the required set point.
5) To adjust setpoint when installed on the machine, mount and
wire the unit. Reset the switch by depressing the reset plunger
andstart the machine. Whenthe machinehas reached fullspeed,
slowly turn the vibration setpoint adjustment counter-clockwise
until the switch trips. Then turn the adjustment clockwise a small
amount (approx. 1/8 turn). Reset the switch and restart the ma-
chine to determine whether the machine starting roughness will
cause the switch to trip, in which case it may be necessary to
increase the setpoint.
ELECTRICAL RESET AND STARTUP LOCKOUT:
The optional electrical reset circuit consists of an electrical sole-
noid in series with a thermistor. If the rated voltage is continu-
ously applied to the reset circuit at machine startup, the reset
solenoid energizes for a fixed time interval (approx. 30 sec.), af-
ter which time the solenoid is automatically de-energized by the
thermistor. This action provides a trip lockout during machine
startup roughness. The voltage must be removed from the reset
circuit when the machine is stopped to allow the thermistor to
cool off. The switch mechanism can then be reset electrically by
a momentary application of the reset voltage or it can be reset
manually.
NOTE: If the machine is restarted immediately after a shutdown,
the lockout period will be shortened because the thermistor will
be hot. An increase in the ambient temperature will also shorten
the lockout period.
ENGINE COMPRESSOR
COOLING TOWER FAN
GEARBOX
VIBRATION SWITCH
LOCATION
SWITCH
LOCATIONS
MOTOR
SWITCH
LOCATION
MOTOR
TYPICALINSTALLATIONS
HEAT EXCHANGER FAN
COMPRESSOR
1 g
SETPOINT
SWITCH
ACTIVATED
2 g
SETPOINT DIAGRAM D
SHAFT
