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damped, to suppress high frequency noise. It is always a good idea to use shielded cable for input signals and ensure the
shield is properly grounded.
NOTE:
The common on the inputs is
NOT
a ground.
Another source of noise is spikes generated by the alarm relay contacts. It may be necessary to suppress the contacts
externally. This is particularly true when the internal relays switch other external relays that do not have spike suppression.
Always ensure that all sources of spikes or noise are adequately suppressed from the environment.
2.2
Adjustments
Since the instruments are crystal controlled, there are no user calibration adjustments. Any of the programmable parameters,
such as scaling, limits, analog out, and so on must be set up using the menu options.
2.3
Connections
All connections are via the rear panel of the instrument – power, sensors, alarms, analog output, and communication. The
rear panel is shown below and may vary slightly depending on what options are in the unit.
Figure 2 ACT-3X Rear panel with Analog Output and USB Option
2.3.1
Power Connections
Power to the unit is connected to the terminals under the sections labeled
POWER
on the rear panel. Be sure the
power supplied matches the specification indicated on the rear panel. Refer to
If the unit is
ac powered
(115 - 230 Vac), connect the Live (Hot) wire to the terminal marked
L
and the Neutral
(Return) wire to the terminal marked
N
.
NOTE:
The ground connection is not required as the unit is fully isolated
from the mains.
If the unit is
dc powered
, connect the dc supply Positive to the terminal marked ―
+
‖ and the dc supply Negative or
Common to the terminal marked ―
-
‖.
CAUTION:
Ensure the dc voltage does not exceed the rating on the unit (12V
±10% or 24V ±10% as marked).
2.3.2
Sensor Connections
A speed sensor (not included) can be connected to the terminals under the section labeled
IN
on the rear panel. Refer
to Figures
and
Connections and their functions are as follows:
+V(A)
Positive Supply Output. Used to provide power to optical, laser, infrared or amplified magnetic sensors.
Voltage out is +24Vdc, +12Vdc or +5Vdc (factory selected). Maximum load is 30mA from the 24V supply
or 60mA from the 5 or 12V supplies.
PX+
This output is for use with two wire proximity sensors. It has internal current sensing. Maximum load for
proper operation with two wire sensors is 20 mA.
SIG
Signal Input. Positive input signal from the speed sensor. Accepts TTL pulses or ac signals, unipolar and
bipolar, from 1.1 Vac to 50 Vac. Connect the signal wire from three wire sensors or the positive side of two
wire magnetic sensors to this terminal. Typical input impedance is 10 Kohms.
COM
Common or Negative Terminal. Common or Negative connection for both signal and power.
on the following page for connection of Monarch standard sensors. The connections are typical for
these types of sensors.
