Micromod Micro-DCI: 53ML5100A LOADING STATION - Manual (Page 21)

2.4.2.1 POWER INPUT (AS SPECIFIED)
2.4.2.1.1 DC Power
Reference Figure 2-4 and connect the remote 24 V dc power supply to the instrument as follows:
1. Connect the positive (+) input line, via a remote SPST switch, to terminal L1.
2. Connect the negative (-) input line to L2.
3. Connect Power Common (PC) to a bus bar that is connected to earth ground (#8 AWG
wire is recommended). Individual wires for each instrument should be run from the
Power Common (PC ) terminals to the bus bar.
NOTE
Use of a common bus bar is recommended to minimize potential voltage
differences that may occur as the result of ground current loops, e.g.,
potential difference between separate signal grounds, power grounds,
etc.
4. The chassis should be grounded by connecting terminal G to earth ground.
2.4.2.1.2 AC Power
Reference Figure 2-4 and connect the specified line service (110-120, 220-240 V ac, 50 or 60 Hz)
to the instrument as follows:
1. Connect the phase or hot line L, via a remote power disconnect switch or circuit
breaker, to terminal L1.
2. Connect the neutral line N to terminal L2 for 110-120 V ac. Connect the neutral line N
to terminal L3 for 220-240 V ac.
3. Connect Power Common (PC) to earth ground (#12 AWG wire is recommended).
4. The instrument case should be grounded by connecting terminal G to earth ground at
the source of supply (green/green-yellow ground).
All supply connections include surge protection rated at 275 V ac normal mode.
NOTE
To minimize possible interference, ac power wiring should be routed
away from signal wiring.
2.4.2.2 CURRENT/VOLTAGE INPUT TO ANI0 AND ANI1
If the signal to an analog input (ANI0 or ANI1) is from a 0-20 mA or a 4-20 mA current transmitter,
the precision 250 ohm (+/- 0.1%) resistor (R1 or R2, as applicable) located on the back of the rear
terminal board must NOT be removed. The resistor is used to accurately convert the current signal
from the transmitter, which is typically 0-20 mA or 4-20 mA, to a specified analog input voltage of 0
to 5 V dc or 1 to 5 V dc respectively. If the input signal is already a voltage signal, its correspond-
ing resistor should be removed (R1 for ANI0 or R2 for ANI1).
53ML5100 Manual Loading Station
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