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In this mode:
The display is updated up to once every two seconds with the average Rate of Change.
The throughput of the max/min, analog outputs, and relays is up to twice a second.
The display will show a positive number when the frequency is increasing and a negative number when the
frequency is decreasing.
Remember that even a small change in RPM over a short time will cause a large Rate of Change (average acceleration)
to be displayed. The gate time for each measurement is about 1/3 of a second. For instance, if you use a digital
function generator to change from 3000 RPM to 3001 RPM, the change will happen all at once. You will see that it
happens within 1/3 of a second. So 1 RPM change in 1/3 of a second is 180 RPM over one minute or 180 PRMPM
acceleration.
4.1.6
Totalizing Mode
In the
Totalizing Mode
, each input pulse causes the display to be incremented by a constant value that is set by the
user. This enables the user to scale the input to obtain a read out in any measure required: number of inches, number of
bottles, number of revolutions, and so on. The scale factor may be set anywhere from 0.0001 to 99,999. The total can
be reset using the
RESET
and
RECALL
buttons pressed together on the front panel. The AUX input (Channel 2) can
be set to reset the totalizer and turn the unit into a batch counter or to inhibit the input signal (see
4.2
Modes of Operation
– Channel 2
Channel 2 is the AUXiliary input and is basically used to control the input to Channel 1, or can be used as an external reset
for the input channel or the Alarms. The user can set the sense of the input, positive or negative. The input has a weak pull-
up resistor internally so it can be used with a potential free contact. All modes are mutually exclusive – only one mode may
be active at any time. Refer to
for details on changing modes.
NOTE:
The instrument is programmed from the factory with the AUXiliary input disabled (OFF).
4.2.1
Off
When programmed OFF this input has no effect.
4.2.2
Inhibit
If programmed as an inhibit pin, it will disable the signal input when asserted (high or low depending on the sense
programmed). It acts as a gate preventing the input signal from updating the unit.
4.2.3
Single Event Capture
When programmed as Single Event Capture (
) this input acts as the second input for the external signal – see
4.2.4
External Reset
– Input Totalizer
If programmed as External Reset for Inputs (
), when asserted (high or low depending on the sense programmed),
it will reset the display (count) to Zero. Used in the Totalizer Mode (see
) to enable the unit as a batch
counter.
4.2.5
External Reset
– Alarms
If programmed as External Reset for Alarms (
), when asserted (high or low depending on the sense
programmed), it will reset any Alarms and drop out any Contact closures. Note: The alarms need to be set up correctly
(see
4.3
Decimal Point
The decimal point on the display may be fixed from 1 to 3 places or may be set to none (only whole number displayed). As
the display increases the unit will automatically drop decimals to show whole number values. Note that for values larger
than 99999 all decimal points light indicating the current reading is x10.
4.4
Alarm Limits
The
ACT-3X
has two independent alarm set points, referred to as
LIMIT 1
and
LIMIT 2
(
Set 1
and
Set 2
on the menu)
.
These limits are fully programmable by the user (unless the write protect option has been set). The limits may be set as high
or low with an option of low limit lockout, latching or non-latching at any value. The limits are accurate to better than
±0.1% of the set point value. Refer to
for the limit response time. The dead band (hysteresis) is also
programmable at any value from 0.0001 to 99.999% of the set point value. The actual output from these alarms is a set of
form C, dry contacts, accessible via barrier strip screw terminals on the rear panel. These contacts are capable of switching 1
A at 250 Vac. When the unit is making measurements, the limits can be viewed by pressing the
UP
button for
LIMIT 1
or the
DOWN
button for
LIMIT 2.
The display will return to normal after a few seconds. The relays may also be set to
be Failsafe, which inverts the sense of the relay so that they are energized under normal condition. In the event of a power
failure the contacts will drop out as they would during an alarm condition. Refer to
