Toshiba T2N - Manual (Page 79)

4.Installation and Wiring
64 PROSEC T2N
(2) Isolated Installation
When the mounting frame has an unstable earth potential, or when it is not
conductive, securely mount the unit with isolation, as shown below.
Dedicated single-point ground
Basic unit
Expansion unit
Isolate from the
mounting surface
FG wiring (2mm
2
) shortest wiring
Power supply modules
(3) When there is no grounding point
When suitable grounding is not available (no dedicated grounding point),
mount by the method of (2) Isolated Installation.
There is no problem with operation if there is mutual connection between
the FG terminals of the T2N itself. However, for safety, carry out single-
point grounding via an impedance* close to the frame.
When a resistor : Ground the frame via 1W-1
Ω
approx.
When an inductance : Ground to the frame via 2A-100
µ
H approx.
* ;