Monarch Instrument ACT-3 - Manual (Page 11)

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Normal line cord connections are as follows:
Black - to L (Live)
White - to N (Neutral)
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 “-”.
NOTE: The ground connection not required.
CAUTION: Ensure the dc voltage does not exceed the rating on the unit (12 to 15 Vdc).
2.1 Noisy Environments
These instruments are highly responsive. They have input ranges up to 999,990 RPM and
250,000 Hz. They therefore have extremely fast input circuitry that may respond to spurious
noise. It is important to provide a clean source of power to the units, either AC or DC, and to
ensure that the input to the unit is free of spikes or any other high frequency noise. In noisy
environments, it may be necessary to supply power through a filter, or alternate source. The
inputs may also need to be 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 input 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 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 Sensor Connections
A speed sensor (not included) is connected to the terminals under the section labeled IN on the
rear panel. Refer to Figures 2 and 3.
Connections and their functions are as follows:
+V Positive Supply Output. Used to provide power to optical, laser, infrared or amplified
magnetic sensors. Voltage out varies between +8 Vdc and +5 Vdc depending on load.
Maximum load is 60 mA dc. This output also has internal current sensing for use with
two wire proximity sensors. Maximum load for proper operation with two wire
sensors is 5 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 from most sensors.
Refer to Figure 3 for connection of Monarch standard sensors. The connections are typical for
these types of sensors.
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@L1 Set Limit 1 set point Enter a maximum of 6 digits with or without
decimal point followed by <CR>.
Recommended values are 0 to 999990.
@L2 Set Limit 2 set point Same as @L1 but for Limit 2.
@H1 Set Limit 1 hysteresis Enter a maximum of 2 digits with or without
decimal point followed by <CR>. Values can
be from 1 to 99 only.
@H2 Set Limit 2 Hysteresis Same as @H1 but for Limit 2.
@G1 Set Gate Time Enter either:
0 for Standard OR
1 for Fast
Followed by a <CR>.
@G2 Set Low End Enter a single character:
0 - 12 seconds
1 - 1 second
2 - 1/2 second
Followed by a <CR>.
@P0 Set Analog Out Enter a maximum of 6 digits followed by a
<CR>. Recommended zero scale values are
0.0 to 999990.
@P1 Set Analog Out Enter a maximum of 6 digits followed by a
<CR>. Recommended full-scale values are
10.0 to 999990.
@C1 Send Current Settings No further input required. The unit will send
a complete listing of all current parameter
settings.
If a user tries to enter too many characters, or enters illegal data, the instrument will respond with
Err and will abort the process. The only valid characters for further data entry, not commands,
are 0 to 9, the decimal point or period, and ‘-’. If the command is successfully executed, the
instrument will again send the OK message.