External Device Connections And Grounding; Lf620F Type - Toshiba LF620F Instruction Manual

5.2 External Device Connections and Grounding

5.2.1 LF620F Type

The terminal board connections of an integral type converter LF620F are shown in Figure 5.1. Proceed
with wiring as described in Section 5.4, "Wiring Procedure."
LF620F
Instrument panel : Ordered separately
Grounding with 100Ω or less
ground resistance
Power switch
(External double-pole power switch)
Power supply
Current output (4～20mAdc)
or PROFIBUS
Digital input (20～30Vdc)
or Modbus
Digital output 2
Signal common for DI and DO
Digital output 1
Grounding with 100Ω or less
ground resistance
NOTE:
To avoid 2-point grounding, ground the
shield of the output cable basically at the
receiving side.
* Use a heavy copper braid or wire (cross-sectional area 5.5 mm
and make it as short as possible as shown in Figure 5.1 for grounding.
Also, Avoid a common ground where earth current may flow. (An independent ground is
preferable.)
* The converter has no power switch. Install the power switch at the system side. Be sure to use a
double-pole/single-throw (both disconnection) wiring breaker.
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I/O cable
(CVV-S)
Figure 5.1 External Wiring Schematic Diagram
－ 24 －
Power cable
(CVV)
NOTE:
In the case of the integral type, the signal line
( A, B, G ) and the excitation line ( E, X, Y )
are the connector joints.
2
minimum) to ground the terminal
6 F 8 A 0 9 2 8
Grounding with 100Ω or less
ground resistance
NOTE:
• When 3-core power cable is used, do not
ground from the external grounding
terminal. Perform grounding at the
receiving side only.
• Only when a 2-core power cable is used,
perform grounding from the external
grounding terminal.
Ⅳ wire 5.5mm
2
or more