Cable Length; Field Wiring Diagrams - Emerson ControlWave GFC IStran Instruction Manual

ControlWave GFC IS Communication Interface Manual (CI-CW-GFC-ISTRAN)

3.3 Cable Length

Warning

3.4 Field Wiring Diagrams

3-2
Underwriter's Laboratories (UL) lists the IStran for use with cable
lengths up to 25 feet on either or both interfaces. Typically, you install
the IStran in close proximity to the communications device (connected
to the non-hazardous interface) and at some distance from the CW-
GFC-IS (connected to the hazardous interface). Because of cable
capacitance and inductance, 25 feet is the maximum cable length
allowable for use with a CW-GFC-IS located in a Division 1 area.
The cable length between a CW-GFC-IS operating in a Division 1 area
and the IStran must not exceed 25 feet.
Figure 3-1 illustrates a typical communication system. The power
source to the non-hazardous interface must not use or generate more
than 250V. If you install the IStran in a Division 2 area, you must make
power input and output connections using Division 2 wiring methods
described in Section 4.1.
In this example a single power source supplies both the communications
device and the CW-GFC-IS. The power supply input range for this
configuration is 8 to 16V. You connect the grounds of both devices
together through the IStran. The CW-GFC-IS power supply current
must be 120mA or less, and it must operate down to 5.9V. The IS
termination panel (part number 400135-01-9) contains the power and
communication connections.
Figure 3-1. Modem System with Single Power Source
System Wiring Issued Nov-09