Sensor Wiring
80
Modline 5
connections. The ground connection at the Terminal Strip Plate and the
interconnecting cable shield should always be connected!
Figure 73: Sensor shield
5)
Several Sensor circuits are connected to an internal common. The minus (–) or common
terminals for the 24 VDC Power Supply, Peak Picker/Track and Hold Switch, and
Analog Output are connected internally.
A.) Connect the Analog Output to devices with differential inputs that have not been
grounded.
B.) The ( – ) terminal of the mA input for remote Emissivity and E-Slope current input
is isolated but will only tolerate a difference of approximately 2 Volts between it and
Sensor Common. Input impedance is 120 Ohms.
See Note 8 for connecting Common to ground
6)
The RS485 Data connection is not isolated. Use an external isolator if isolation is
required.
7)
Alarm Relay contacts are isolated from ground and Sensor internal common.
8)
For the Terminal Strip Plate: Depending on the installation, the internal common will
be connected to ground through a 100 Ohm 1 Watt fusible resistor.
See Section 4.8 for details.
9)
The Terminal Strip Plate is supplied with a transient suppressor across the Red and
Red/White power supply wires on the left side of the terminal strip.
10)
The Terminal Plate is supplied with a ceramic ferrite bead for the Red and Red/White
power supply wires.
11)
The Terminal Strip Plate must be placed in a metal enclosure for protection from
electrostatic discharge (ESD).
4.12
Summary Caution and Warning
Inspect the installation for proper wiring, possible loose connections or potential shorts.
The installation of the Sensor described in Section 3
The wiring of the Sensor and system devices described in this Section 4
also be complete. The Modline 5 Sensor can now be powered and the initial setup for operation
performed as described in Section 5
Look for any signs of overheating or smoking when applying power. Investigate any signs of improper
installation
Please read the following important Caution and Warning.
Sensor
Input/Output
System
Device