Micromod Micro-DCI: 53IT5100A Indicator/Totalizer - Manual (Page 23)

2.4 CONNECTIONS
2.4.1 PREPARATORY
The 53IT5100 can be configured for one to four analog inputs (ANI0-3), one analog output (ANO0),
two control contact inputs (CCI0 and 1), two control contact outputs (CCO0 and 1) and Datalink net-
work interconnectivity. Therefore, prior to making electrical connections, 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 conditions 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 dis-
tance should not exceed the limit specified for the particular transmitter (refer to applicable techni-
cal literature provided for the respective device). Polarity must be observed when connecting the
remote transmitters to the instrument.
The instrument has a vertically mounted terminal strip (TB1) for signal interconnections and a hori-
zontally mounted terminal strip (TB2) for power wiring. Both terminal strips are located at the rear
terminal board of the instrument case.
SNAP-OUT TERMINAL CONNECTORS
Both terminal strips, TB1 and TB2, have removable plug-in connectors.
The upper connector for TB1 has screw lugs 1 through 12 and the lower
connector has screw lugs 13 through 22. All of the screw lugs are on a
single connector for TB2. To remove a signal connector, grasp it
securely on both sides with the thumb and forefinger, rock it gently
from top to bottom (not side to side) and pull it straight out. To remove
the power connector, grasp the sides firmly with the thumb and
forefinger, rock it gently from side to side and pull straight out. Each
connector is keyed and has one scalloped side as an aid to proper
insertion alignment after the wires are connected. (See Figure 1-2.)
NOTE
The screw lugs 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.
Section 2. Installation
2-5