MODEL 365A & E365A
INSTRUCTION MANUAL
VIBRASWITCH
®
MALFUNCTION DETECTOR
909GF294
PAGE 15
5.
MAINTENANCE
The
Vibraswitch
®
does not normally require any maintenance or repair; however, listed below are some
of the possible malfunctions that may occur and their recommended solutions.
5.1
FUNCTIONAL TEST
(Ref. Figure 4-1)
1.
With the
Vibraswitch
®
cover sub-assembly removed, place the
Vibraswitch
®
on a table
with its mounting surface horizontal.
2.
Press RESET button. If switch does not “reset” (armature latched on stop pin), turn set point
adjustment screw CCW until switch can be manually reset.
3.
Slowly turn SETPOINT adjustment screw CW until switch trips. This is the Zero trip point
or the amount of spring tension required to overcome the 1 g force exerted by the earth’s
gravitational pull.
4.
Note SETPOINT adjustment. One complete turn equals approximately 1 g. Set point scale is
marked in 0.1 g increments. Turn the set point adjusting screw 1 complete turn CCW. This
is a 1 g setting above the earth’s gravitational pull.
5.
Manually reset the switch (press RESET button).
6.
With the RESET button to your right and the SETPOINT adjustment screw to your left,
slowly rotate the
Vibraswitch
®
toward you 90
°
. The switch will trip when the mounting
surface is in a vertical plane and the earth’s gravitational pull is not aiding the lower magnet
to hold the armature against the stop pin.
5.2
TROUBLESHOOTING
There are several possible failure mode for the
Vibraswitch
®
and the following paragraphs provide
information to diagnose the possible causes:
5.2.1
Vibraswitch
®
Will Not Reset
1.
Dirt and/or metal chips on magnets
Clean magnets
2.
Broken leaf spring (Refer to Figure 4-1).
Return Vibraswitch
®
to the factory for repair.
3.
Open reset coil
Check for continuity and proper coil resistance (refer to Table 5-1). If reading is not
acceptable return Vibraswitch
®
to the factory for repair.
Table 5-1. RESET COIL RESISTANCE
NOMINAL VOLTAGE
RESISTANCE (Ohms ± 10%)
12 VDC
12
24 VDC
56
48 VDC
233
117 VDC
1012
120 VAC
240 VAC
Check for continuity only.
(Diode prevents actual resistance reading)
