Micromod Micro-DCI: 53SL5100B Single Loop Controller - Manual (Page 18)

53SL5100B Single-Loop Controller
INSTRUCTION MANUAL
2.4.1 Power Wiring
Refer to the instrument model number to verify the power input requirements:
 53SL511…. – AC Power
 53SL512…. – 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 Contact Input to CCI0
Separate contact input signals to CCI0 and CCI1 can be used for alarm inputs. One side of each
remote contact must be connected to power common as illustrated in Figure 2-4. Minimum opened
or closed recognition time for a remote contact must be 0.05 seconds.
2.4.2.3 Current Output from ANO0
A current output signal is available for re-transmission of one of the input signals ANI0 through
ANI3. Observe the proper polarity when connecting the output to another instrument.
2.4.2.4 Contact Output CCO0
Discrete contact output CCO0 is identified in Figure 2-4. Each discrete output is a solid state switch with a
rating of 30 V dc, 50 mA maximum. A CCO is referenced to power common. When this contact is connected
to an inductive load, an external arc suppression network is required for contact protection.
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