Micromod Micro-DCI: 53ML5100 Manual Loader - Manual (Page 20)

53ML5100B Manual Loader
INSTRUCTION MANUAL
2.4.1 Power Wiring
Refer to the instrument model number to verify the power input requirements:
 53ML511nB21AAA – AC Power
 53ML512nB21AAA – DC Power
2.4.1.1 DC Power
Reference Figure 2-4 and connect the remote 24 V dc power supply to the instrument as follows:
1. Connect (+) input line, via remote SPST switch, to terminal L1.
2. Connect (-) input line to the system bus bar. The bus bar should be connected to a good earth ground
(#8 AWG wire is recommended). Individual wires should be run from the controller Power Common
(PC ) and Signal Common (SC ) terminals to the bus bar. The chassis should be grounded by
connecting terminal G to earth ground.
 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.
2.4.1.2 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 to a good earth ground (#12 AWG wire is recommended). 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 Field Signal Wiring
2.4.2.1 Current/Voltage Input to AIN0 and AIN1
When the input signal is from a 4-20 mA current transmitter, a precision 250 ohms (+/-0.1%) resistor is
required. (The resistor tolerance is critical, as the resistor is used to accurately convert the current signal from
the transmitter, which is typically 4-20 mA, to a specified analog input voltage of 1 to 5 V dc). The back of the
rear terminal board has the appropriate resistors (R1 and R2, respectively) for ANI0 and ANI1.
2.4.2.2 Current Output from ANO0 and ANO1
The 53ML5100 Manual Loading Station provides the capability to manually adjust and display one or two
current outputs. Each output is independently configurable as a 0-20 mA or 4-20 mA signal. (The
configuration selections for each analog output are provided in Section 4.) Observe the proper polarity when
connecting each analog output to another instrument.
2.5 Factory Set Calibration
Each unit contains individual factory set entries that calibrate the four analog inputs (ANI0 through ANI3) and
analog output (ANO0). There is a calibration sheet supplied with each instrument that should be retained for
future reference when the installation is completed. Reference Section 5.3 for additional information.
2.6 Grounding
Installations are expected to have access to an independent, high quality, noise-free point of earth reference.
The system should be connected by a dedicated, low resistance (less than one ohm) lead wire directly to the
installation’s point of earth reference. This ground reference is referred to as the Instrumentation Ground. If
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