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M9005 • REV N
(May 2017) Page
8 of 12
Determining Output Voltage
If it is desired to determine either the acceleration or velocity amplitude when one measure
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ment is unknown, the following formulas can be employed.
If g’s (A) are known and you wish to determine the velocity output:
If velocity is known and you wish to determine the displacement output:
If g’s (A) are known and you wish to determine the displacement output:
V = ips, peak
F = RPM
A = g peak
D = mils, peak-to-peak
USER ADJUSTMENTS
Limit Trip Delay
The Limit Trip Delay adjustment allows the user to set the time delay from 1 to 15 seconds.
This is useful in avoiding false trips from transient conditions while the machine is running.
Adjustable Startup Trip Delay (optional)
The optional Startup Trip Delay adjustment allows the user to set the time delay from 1 to
30 seconds. This is useful in tailoring the Startup Trip Delay for a particular machine’s startup
vibration characteristics.
Limit Settings
The Limit Setting adjustment allows the user to set the vibration levels at which a limit will
trip. The adjustment has a range of -10% to 110% of the full scale vibration level. A midscale
adjustment corresponds to a 50% vibration level limit. The limit setting can be set precisely
by measuring the limit voltage with a DVM. The test points for measuring this voltage are
labeled TP3 (Limit 2), TP4 (limit 1) and COM (common) on Figure 2. The DC voltage repre
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sents a percentage of full scale. For example, .46 VDC would represent a limit setting of 46%
of full scale. Turning the adjustment to its minimum value (CCW) allows the user to test the
trip circuitry, including LED’s, time delays and triac (FET) switches.
AUTO RESET
The switch outputs (triacs or FETs) are configured at the factory for latching operation. The
switch outputs can be configured for non-latching operation so they automatically reset when
the vibration level falls below the alarm limit threshold. To do this, remove power to the
unit. Remove the transmitter cover and the display board if present. Refer to Figure 7. (Move
both jumpers to the auto position). Reassemble the display board and transmitter cover. The
switch outputs will now reset when the vibration level falls below the alarm limits.
V=
3687
x A
F
D= 19,100 x V
F
D=
8383
2
x V
F
( )
Example V= 3687 x 0.5g = 1.02 ips, peak
1800 RPM
