Fire Fighting Enterprises Vibration Switch: Explosion Proof User Manual
Page 3
Doc. No. 0115-03
Page 3 of 4
30.01.06
Note: ** Contact Arrangement 2B, only to be used with circuits of equal potential
5. ADJUSTMENTS AND SETTING
Note: Isolate power elsewhere before any removal of covers.
Remove grommet over set level screw, rotate set screw fully clockwise, approximately 6 turns from flush (See
Fig. 4) using a non – magnetic screwdriver.
Reset switch by depressing the Reset button, check electrical connections show “Safe Condition” i.e. normal
running, (see Fig 2). If the vibration switch is connected for machinery shut – down, link out switch during next
operation, if required.
With machine running normally, rotate set level anticlockwise until switch just trips. Reset carefully,
readjusting set level screw until switch no longer trips. This determines the setting for NORMAL or AMBIENT
machine level. Vibrations above this level will now cause the vibration switch to operate.
Actual AMBIENT vibration level in ‘G’ can be determined by counting rotations of set screw back from flush
setting (Fig.4) and referring to the Calibration Curve, Individual or Typical (Fig.3).
The switch is then adjusted be clockwise rotation of the set level screw to the desired level for machinery
protection. (Starting and stopping of the machine is recommended to check protection level set is adequate to
accommodate any transient excess vibration periods or resonance during these periods).
After final setting, replace the sealing grommet over the set level screw. If anti – tamper protection is required it
is suggested the cavity be cleaned and filled with soft sealing wax or a non-corrosive sealing compound (Dow
Corning 744 or direct equivalent).
9
FIGURE 4
SECTION A-A
SCREW TURNS FROM FLUSH
0
PEAK '
G
'
1
2
3
4
7
6
5
8
A
5
FIGURE 3
3
2
1
4
7
6
A
SET LEVEL SCREW
FLUSH POSITION OF
TYPICAL CALIBRATION CURVE
10
11
3171 SWITCH
FIGURE 2
2B**
2A
2C
12
3
1
2
3
4
1
2
3
4
2D
1
2
3
4
5
6