Alternative Wiring
3.4 EMC
The G128-809 emits radiation below the level called for in its
CE mark test.
Immunity from external interfering radiation is dependent on
careful wiring techniques. The accepted method is to use
screened cables for all connections and to radially terminate
the cable screens, in an appropriate grounded cable gland, at
the point of entry into the industrial steel enclosure. Exposed
wires should be kept to a minimum length. Connect the
screens at both ends of the cable to chassis ground.
3.5 Power supply
The G128-809 can use either an AC or DC input supply.
It must be possible to switch off the supply to the G128-809
using a suitable switch or disconnecting device. A suitable fuse
must be fitted where DC supply is used.
• The AC supply can be in the range 90 to 260VAC,
45 to 65Hz.
• The DC supply can be in the range 90 to 350VDC.
5 Front panel
Caution: Never carry out any work
on the G128-809 when power is present.
Danger to life.
4 Set-up
4.1 Input
The AC or DC supply connection is made using the screw
terminals shown in the block wiring diagram. Wiring must be
carried out properly to ensure protection against electric
shocks.
4.2 Output
The +24V, 0V and DC OK signal is available on the screw
terminals. The DC OK output provides 24V @ 20mA while
supply is operating correctly. Refer to block diagram.
4.3 Short Circuit/Overload
The G128-809 is short circuit protected and idle proof. In the
event of an error the DC output is limited to 33V +/– 5%.
4.4 Redundant Operation
Multiple G128-809’s can be connected together to form a
redundant power supply.
Preferred Wiring