YOKOGAWA ZR22S, User Manual

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<5. Wiring>
5-10
IM 11M13A01-02E
5.5.2 Grounding Wiring
The ground wiring of the detector should be connected to the ground terminal of the detector
case. The ground wiring of the converter should be connected to either the ground terminal of the
converter case or the protective ground terminal in the equipment. The grounding terminals of the
detector are of size of M4 (inside) and M5 (outside), and the grounding terminals of the converter
are of size M4. Proceed as follows:
(1) Keep ground resistance to 100 Ω or less.
(2) When the ambient temperature of the wiring installation is 75 to 150
° C for the wiring of the
detector, use wiring material with sufficient heat resistance.
(3) When connecting the ground wiring to the ground terminal of the converter case, be sure
that the lock washer is in contact with the case surface (see Figure 5.9.).
(4) Ensure that the jumper plate is connected between the G terminal and the protective ground
terminal of the converter.
(5) No intermediate parts are used for the internal ground terminal of the detector. Use crimping
terminal for connection to the internal ground terminal 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.
5.6 Contact Output Wiring
Contact outputs 1 to 3 can be freely assigned to “low limit alarm”, “high limit alarm”, etc. user
selectable, but the assignment of contact output 4 is fixed (“error output”). And the action (contact
closed on error output) also cannot be changed.
When using these contact outputs, install the wiring as follows:
#1 Output
#2 Output
#3 Output
#4 Output
DO-1
DO-1
DO-2
DO-2
DO-3
DO-3
Terminal box Annunciator or the like
F05-10E.ai
Converter
DO-4
DO-4
Figure 5.10 Contact output wiring
5.6.1 Cable Specifications
Number of wire in cable varies depending on the number of contact used.