Grounding Of L3 Controller; Cautionary Requirements In Grounding The L3 Controller - Toshiba V Series User Manual

Chapter 3 Installation & Wiring

3.4 Grounding of L3 Controller

3
3.4.1

Cautionary Requirements in Grounding the L3 Controller

52
Grounding is important to ensure safe and stable system operation. Ground the L3
controller properly, taking account of the requirements specified in the following
paragraphs.
To ground the L3 controller, connect the ground terminals of each cubicle, console, line
filter, I/O power supply, etc., as well as the shield of external signal cable, all together to
the ground terminal of the incoming/distributing unit or peripheral equipment.
• Be sure to ground the L3 connector, to protect operators and maintenance personnel from
electric shock and to prevent noise.
Incoming/distrib
uting unit
Shield zipper
tube
100 Vac
Figure 3-10 Schematic Grounding Diagram for L3 Controller
Isolation from building
To avoid influence of noise current flowing in the building, isolate each console from the
building.
WARNING
I/O system power supply unit
Frame ground
FG terminal on terminal
unit
Ground
Multi-core external signal cable
100 Ω or less
(Exclusive Class-D grounding)
model 3000 Loop Controller L3 User's Manual - Basic Hardware -
Shielded terminal
Insulating plate
Channel base
Floor of the
control room
Building frame