Mitsubishi MELSEC F FX-40DU-E Handy Manual page 16

2.
INSTALLATION, WIRING AND GENERAL SPECIFICATIONS
Cautions on Connections
POWER SUPPLY
*1 The current consumption of the FX-40DU-E is only 220 mA. If power is to be supplied from a
programmable controller master or extension board, the total electric current to be supplied to
proximity switches and extension blocks must be taken into account. If this total current exceeds
the service capacity then the FX-40DU-E must be powered by an external power supply.
Operation of the FX-40DU-E will continue through momentary power failures not exceeding 5
ms in duration. In the event of longer power failures and voltage drops the FX-40DU-E will stop
operation. It will automatically restart operation on resumption of the normal power supply.
(The screen display on recovery is determined by the settings described on page 22).
*2
The wires used for the power supply wiring should have a cross sectional area of at least 0.75
m m 5 0 ensure that there is no voltage drop. Also, use M3 solderless terminals and tighten with
a tightening torque of 5 to
8
kg.cm.
*3
The internal circuitry of the FX-40DU-E includes a protective circuit to prevent sneak current if
the wires to the plus and minus terminals of the 24V DC power supply are connected incorrectly
(with reverse polarity). However, you are recommended to install a 2A fuse in the power supply
wire to prevent damage in the event of an external short circuit.
GROUNDING
*4
The wire connected to the ground terminal should have a cross sectional area of at least 1.25
mm. Carry out class
3
grounding (10052 max.).