1640-IN-031-C-08
Page 42 of 104
Eurotherm/Barber-Colman
MACO Series Controller Installation
Note: When counting boards in multi-rack
systems (for switch settings, RLD/screen pro-
gramming) count each control rack separately.
Class 2 Wiring must be separated a minimum of
1/4 inch from any Class 1 conductors.
6.2.2 Analog Input/Output Wiring Guidelines
1. Use braided shield cables on ALL analog inputs and outputs. Use separate
cables for each function and keep cables less than 3 meters in length. If cables
are over 3 meters long, an overbraid is required. If overbraid has been used,
terminate both the internal braided shield and the overbraid at the ground
distribution block (see figures 6.3 and 6.4).
2. Analog Input (-) must be connected to Analog Common at the sensing device
to prevent ground loop currents.
3. Excitation voltage for potentiometers is provided by the card. Excitation voltage
is +10 Vdc @ 20 mA. Potentiometer resistance should be 500Ω to 2kΩ.
6.2.3 Analog I/O Applications Wiring
Figures 6.3 and 6.4 illustrate typical analog I/O wiring for the control card. Note that
this drawing is "typical" only. Actual wiring will depend on the sensors and control
elements used.
6.3 Wiring of DC Inputs & Outputs
The DC Input and Output functions require an external, regulated DC power supply
capable of providing a nominal voltage of plus (+) 24 Vdc. The power supply must
be CE recognized. The power supply and its ground distribution block must be
located within 30 cm of the bottom of the controller chassis. There must be NO
other (external) devices powered from the supply. The current rating of the power
supply will depend on the loads being driven. Note that there are only four input and
output functions and they are shared by all four channels if the card is so specified.
1. Connect (+)DC to Pin 5 of the top connector (P14). This supplies the voltage for
the output circuits.
2. Connect (-)DC to Pin 6 of the same connector. This supplies DC Common for
both the input and output circuits.
3. Connect the outputs to one side of the loads. Connect the other side of the loads
to (-)DC.
18 gauge wire is recommended as a minimum, but make certain to satisfy all local
and national code requirements.
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