YOKOGAWA av550g, User Manual

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< 5. Wiring >
5-9
IM 11M12D01-01E
5.2.6 Ground Wiring of Detectors
Connect the ground wiring to the external ground terminal on the detector case or the internal ground
terminal. Follow the instructions below. The ground terminal screw is M4.
(1) The ground resistance should be 100 Ω or less (equivalent to Class D grounding).
(2) If the ambient temperature of the wiring installation exceeds 75°C, use appropriate heat resistant
wires.
CAUTION
The flange bolts alone do not provide durable grounding of the detector. Be sure to grounded the
ground terminal.
5.2.7 Wiring for Individual and Average Concentration Analog Outputs
For the signal wiring to analog outputs, use shielded cables that withstand temperatures of at least
80°C. The number of cores is determined by the number of outputs. If a cable gland is not installed on
the wiring hole of the averaging converter, use a wire with an outside diameter of 17 mm or smaller.
If installed, use a wire with an outside diameter of 6 to 12 mm. Like the signal wiring to detectors, the
shields should be connected to cable shield ground terminals on the case of the averaging converter.
The load resistance from the averaging converter, including the wiring resistance, should be 550 Ω or
less.
1
2
3
4
5
6
7 7 7 7
8 8 8 8
Receiver
Control Card
CH1 CH4
Averaging Converter
Shield
Shield
Ave-a
Ave-b
Ave-c
Channel Card
Averaged Analog Output Individual Analog output
CH3
+
–
–
+
–
+
–
+
–
+
–
+
–
+
–
F5-11E.ai
+
CH2
AO
Figure 5.11 Wiring for Individual and Average Concentration Analog Outputs