4/20 mA 2 active wire sensors/transmitters
■ C1: signal (return to ground).
■ C2: not connected
■ C3: positive power supply (+24 Volts).
4/20 mA 3 active wire sensors/transmitters
■ C1: signal (return to ground).
■ C2: power supply (0 Volts).
■ C3: positive power supply +24 Volts.
Note
For each family of sensors, on the measurement channel circuits:
■ Programming will be carried out by Oldham (programming circuit pads).
■ A programming circuit (Explo 340 mA or 4-20 mA) will be inserted on the
mounting by the manufacturer (Figure 4, ref. S and T).
Alarm relays
The MX 32 controller uses two alarm relays per measurement channel which
correspond to two instant pre-programmed alarm thresholds 1 and 2.The
relays are energized (de-energized available on request) and voltage-free.
■ The relay corresponding to alarm 1 is connected to the RL1 (green)
terminals on the 12 point connector for each channel card.
■ The relay corresponding to alarm 2 is connected to the RL2 (grey)
terminals on the 12 point connector for each channel card.
The relay contacts can be used "normally open" (NO) or "normally closed"
(NC) by flipping the corresponding switch (Figure 4, ref. U or V for AL1 alarms
and references W and X for AL2 alarms).
Refer to the wiring examples beginning on page 11.
Relay fault
The MX 32 controller uses one "Fault" alarm per measurement channel (visual
and auditory) but a single shared "Fault" relay for both channels. The fault
relay is energized and voltage-free. The shared fault relay can be connected
to the points marked DEF (fault) on the 12 point terminal block for the power
supply card.
The relay contact can be used "normally open" (NO) or "normally closed" (NC)
by flipping the corresponding switch (Figure 4, ref. L).
Refer to the wiring examples beginning on page 11.
Wiring examples
The following pages contain two examples of wiring.
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