4. Installation Specifications
4-20
TI 33Q01J10-01E
Notes for Installing Devices
This section describes notes for installing devices and installation restrictions.
Rules of Connection for the Housekeeping Unit (HKU)
The HKU owns a function which controls temperature rises by rotating the fans at high speed if
the intake temperature becomes 35 °C or more, or the exhaust temperature becomes 40 °C or
more in the I/O expansion cabinet (ACB21).
When installing cabinet installation type nodes (when suffix codes -S1 or -S2 are selected) into
the I/O expansion cabinet (ACB21), a connection between the HKU and the node is needed.
When connecting, even with generation, a specification of which node is to be connected to
the HKU must be made. When installing cabinet installation type nodes into the I/O expansion
cabinet (ACB21), the connection between the HKU and node will be prioritized by R3→R2→
R1→F3→F2→F1 from the node installation position.
In other words, connections in the HKU will be made as follows. If R3 is being installed,
connection will be to the R3. If R2 without R3 is being installed, connection will be made to the
R2. If R1 is being installed without R3 and R2, connection will be made to the R1. If F3 is being
installed without R3, R2, R1, then connection will be made to F3.
For example, if nodes are installed in F1, R1, R2, then the HKU will be connected to the node in
R2.
If no nodes are installed in the cabinet, as the HKU will not have anything to connect to, the HKU
will not function and the fan will rotate at high speed.
The diagram below shows the connection position of the HKU cable to the node.
R1
R2
R3
Cabinet (rear)
Node (right)
Insertion
direction
F040105.ai
Cable for HKU
Figure Housekeeping Unit Connection (Connected to Node in R3)
May 18, 2007-00