Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 82)

IM 11M12D01-01E 5-2
5.1.1 Wiring Precautions
5.1.1.1 Precautions Concerning the Correspondence Between Detectors and Channel Cards
Multiple detectors are connected to the averaging converter. Make sure that the wiring is
run properly between the detector and its corresponding channel card on the averaging
converter. Special care should be exercised so that the channel number of the detector
signal line from the channel card corresponds the one of the detector heater line from the
power supply unit. Disagreement may result in malfunction of the detector as well as
invalid operation. (A channel number is indicated in the channel card slot.)
The specified number of channel cards per purchase order is factory installed in channels
in order from CH1. The factory-installed channels can be changed as desired. All the
channels are the same. Note that in a 4-channel base averaging converter (AV550G-A-),
channels CH5 to CH8 cannot be used.
To remove a channel card, loosen the 2 screws attached to the top and bottom of the
card, and then while holding the loosened screws, pull straight away from the slot. To
install a channel card, insert the card by sliding along the guide rail in the slot, and then
securely tighten the 2 screws.
WARNING
• Using a channel card installed without 2 screws tightened, may result in poor
resistance to noise.
5.1.1.2 Precautions in Processing Shields
When a shielded cable is required for wiring, follow the instructions below to process
the shield.
(1) All the shields should be connected on the averaging converter side: Connect to the
cable shield ground terminals inside the averaging converter.
(2) The shields should not be connected on the other side of the cable. To avoid any
possible contact with housings of instruments connected or metal parts, conductors of
the shields should be processed using insulating tapes or in an appropriate way.
(3) The shields should be connected to the cable shield ground terminals immediately
after the cable is inserted into the averaging converter through the wiring hole.
Having a long distance between the wiring hole and the cable end where the shield
goes out, may result in poor resistance to noise.