Micromod Micro-DCI: 53SL5100A Single Loop Controller - Manual (Page 21)

Single Loop Process Controller Instruction Manual
Installation 13
2.4 Connections
2.4.1 Preparatory
The 53SL5100A can be configured as a Single Loop Controller, Analog Backup Controller, Ratio Control-
ler, or an Automatic/Manual Station. Therefore, prior to electrical interconnection, the particular instrument
configuration should be determined with all assigned inputs and outputs identified to assure proper signal
routing.
2.4.2 Wiring Procedure
Provisions for electrical interconnections are located at the rear of the instrument case. Under ideal condi-
tions the use of shielded cable may not be required. In noisy locations all system input, output and power
wiring should be enclosed in electrical conduit. System interconnection cables (except for power cables)
should be fabricated from 2-wire shielded signal cable. Signal transmission distance should not exceed the
limit specified for the particular transmitter (refer to applicable technical literature provided for the respec-
tive device). Polarity must be observed when connecting the remote transmitters to the controller.
The controller has a vertically mounted terminal board (TB1) for signal interconnections and a horizontally
mounted terminal board (TB2) for power wiring. Both terminal boards are located at the rear of the instru-
ment case.
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 controller, 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.
SNAP-OUT
TERMINAL STRIPS Both terminal boards, TB1 and TB2, have removable plug-in
connector strips. The upper strip for TB1 has connectors 1
through 12 and the lower strip has connectors 13 through 22. All
of the connectors are on a single strip for TB2. To remove a
connector strip, grasp it securely on both sides with the thumb
and forefinger and pull it straight out. Each strip is keyed and has
one scalloped side so that after the wires are connected, it can not
be inadvertently misaligned when inserted.
✎ Note
The screw terminals on the back of the instrument are designed for
12 - 24 AWG wire. It is important that the wire be stripped to expose
1/2 inch of conductor before installation.
∆ Warning Instruments that are powered from an ac line service constitute a
potential electric shock hazard to the user. Make certain that these
system ac power lines are disconnected from the operating branch
circuit before attempting electrical interconnections.