Precautions For Replacement Of Base Unit And Extension Cable; Precautions For Replacement Of Base Unit - Mitsubishi Electric MELSEC Q Series Handbook

5
REPLACEMENT OF BASE UNIT AND EXTENSION CABLE

5.3 Precautions for Replacement of Base Unit and Extension Cable

5.3.1 Precautions for replacement of base unit

(1) When replacing the AnS/QnAS small type series base unit with the Q series, it is
necessary to redo the mounting holes to fix the unit to a control panel, since the two
series have different mounting hole size.
(2) Installation method for the Q series base unit using the existing mounting hole
(a) Replacement with the Q series large type base unit (AnS series size)
Reprocess of the mounting hole is not required, because the Q series large type base unit (AnS
series size) and the existing AnS series base unit are the same dimensions.
(b) Replacement with the upgrade tool (base adapter)
When the Q series base unit is installed using the existing mounting hole, reprocess of the hole is not
required by using the upgrade tool (base adapter) manufactured by Mitsubishi Electric Engineering
Co., Ltd.
For the upgrade tool, please consult your local Mitsubishi Electric sales office or representative.
(3) Internal current consumption (5VDC)
The Q series base unit consumes 5VDC internally as well as CPU modules and I/O modules. When the
internal current consumption (5VDC) of entire system is calculated, consider the current consumption of
the base unit.
(4) Extension base unit (type requiring no power supply module)
(a) Power supply module
The extension base units (Q5B and QA1S51B) are supplied 5VDC by the power supply module on
the main base unit. Therefore, select the rated output current (5VDC) of the power supply module on
the main base unit so that 5VDC on the Q5B and QA1S51B is satisfied.
(b) Voltage drop by an extension cable
The voltage drop in an extension cable occurred, because the extension base units (Q5B and
QA1S51B) are supplied 5VDC through the extension cable. For the voltage drop, refer to the QCPU
User's Manual (Hardware Design, Maintenance and Inspection)
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