Pro-face LT series, Hardware Manual

Page: 34 / 143

LT System General Rules for Implementing
34
1
Multipoint grounding is permissible if connections are made to an equipotential
ground plane dimensioned to help avoid shielded cable damage in the event of
power system short circuit currents.
For more details, refer to Grounding Shielded Cables
(see page 39)
.
The wire to use with the removable terminal blocks is 0.20 to 0.81 mm
2
(AWG 24
to 18).
Terminal Block
Not plugging the terminal block into rear module correctly can cause an electric
shock or unintended operation of the application and/or can damage the rear
module.
NOTE:
To help prevent a terminal block from being inserted incorrectly, clearly and
uniquely code and label each terminal block and rear module.
Avoid temperature changes on the thermocouple's connection terminal.
Temperature measurements may not be accurate due to temperature changes in
the cold junction (LT connection terminal for the thermocouple compensation cable).
WARNING
IMPROPER GROUNDING CAN CAUSE UNINTENDED EQUIPMENT OPERA
TION
z
Use cables with insulated shielded jackets for analog Input/Output, fast
Input/Output and communication signals.
z
Ground shielded cables for analog Input/Output, fast Input/Output and
communication signals at a single point
1
.
z
Always comply with local wiring requirements regarding grounding of shielded
cable.
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
DANGER
FIRE HAZARD
Use only the recommended wire sizes for I/O channels and power supplies.
Failure to follow these instructions will result in death or serious injury.
DANGER
UNINTENDED EQUIPMENT OPERATION OR ELECTRIC SHOCK
Be sure to connect the terminal blocks to their designated location.
Failure to follow these instructions will result in death or serious injury.