2. Transportation, Storage and Installation
2-27
TI 33Q01J10-01E
Isolation Bush
In the front of the I/O expansion cabinet (ACB21, ACB41): for cabinet installation type node
and the rear: for 19-inch rack mount type (ACB
1-S2
0), the cabinet installation type node
is installed in the front. For this node, the independent grounding plays an important role in the
circuit systems.
Therefore, in order that the rear 19-inch rack mount devices do not pass the grounding current
which is important to the node, it and devices manufactured by other companies, must be
insulated with an insulation brush. As devices manufactured by Yokogawa (Models ACG10S,
ABC11S/ABC11D, etc.) also do not have the guarantee that it will share a common power supply
or grounding with the Model ACB21 or ACB41 itself, make sure to insulate with an isolation bush.
In the front and rear of the I/O expansion cabinet: (ACB
1-S3
0) installing 19-inch rack
mount devices, the installed devices cannot restrict, similar in panels. Therefore, to ensure that
problems will not occur whatever is connected to the grounding, insulate Yokogawa devices
(Models ACG10S, ABC11S/ABC11D, etc.) with the isolation bush.
TIP
The isolation bush of Yokogawa devices can be eliminated if both I/O expansion cabinet types are installing
Yokogawa devices (Models ACG10S, ABC11S/ABC11D, etc.) and shares a common power supply and
grounding with Model ACB21, ACB41, and only when other company devices are insulated with an isolation
bush.
Installation Direction
Install the device in the rack with the screws in the vertically correct direction.
Check the installation direction by referring to “External Dimensions (SD)”.
TIP
When the device is supplied with power even if it is temporary, the device must be installed on the rack.
Placing the device on a desk etc. and laying it on its side should be avoided.
The device may become malfunction if the heat radiated from the device cannot be cooled smoothly.
Providing Space for Heat Radiation
Leave space at the top and bottom of rack-mount equipment to permit heat radiation.
• Separate the top of the instrumentation board at least 100 mm away from the ceiling, and
cut a ventilation hole of 200 cm
2
or larger in the ceiling or install a ventilation fan.
• Keep at least 50 mm between the back of the equipment and the instrumentation panel or
wall.
• When installing an 19-inch rack mount devices on the same rack, maintain a 3-unit spacing
(1 unit: 44.45 mm) between devices.
Do not use any space between equipments for cable wiring or anything.
• Do not block the ventilation openings in top and bottom face of equipment.
Sep. 30, 2008-00
