YOKOGAWA ZR202S, User Manual, Page: 58 / 163

<5. Wiring>
5-5
IM 11M13A01-04E
5.3 Wiring Power and Ground Terminals
Wiring for supplying power to the analyzer and grounding the equipment.
1 2 C DO DO
DI
1 2
FG L N G FG
- +
AO
~
100~240 V AC
50/60 Hz
F5-5E.ai
Jumper plate
Grounding to the earth terminal
on the equipment case
Equipment case
Lock washer
Crimp on terminal of
the ground wire
Grounding
terminal
Ground
Figure 5.5 Power and Grounding Wiring
5.3.1 Wiring for Power Line
Connect the power wiring to the L and N terminals of the equipment. For a three-core cable, ground
one core appropriately. Proceed as follows:
(1) Use a two-core or a three-core cable.
(2) M4 screws are used for the terminals. Use crimp-on terminals appropriate for M4 terminal
screws for cable connections.
5.3.2 Wiring for Ground Terminals
The ground wiring of the analyzer should be connected to either the ground terminal of the equipment
case (M5) or the terminal inside of the equipment (M4). Proceed as follows:
(1) Keep the ground resistance of 100 Ω or less (JIS D style (Class 3) grounding).
(2) When connecting the ground wiring to the ground terminal of the equipment case, be sure that
the lock washer is in contact with the case surface (see Figure 5.5.).
(3) Ensure that the jumper plate is connected between the G terminal and the FG terminal of the
equipment.
(4) The size of external ground screw thread is M5.
Each cable should be terminated corresponding crimp-on terminals.
(5) No intermediate parts are used for the ground terminal inside of the equipment. Use crimping
terminal for connection to the ground terminal inside of the equipment in order to avoid corrosion
by high contact potentials.
(6) In order to prevent the earthing conductor from loosening, the conductor must be secured to the
terminal, tightening the screw with torque of approx. 1.2 N•m (for M4) or 2.0 N•m (for M5).
(7) Care must be taken not to twist the conductor.