© Copyright Omniflex Data subject to change without notice
M1102A Rev. 11.04.03
I N S T A L L A T I O N G U I D E
MAXIFLEX 1000 SERIES
Power Supply – 24Vdc I/P + Logic
Model No: M1102A
General Description
The Maxiflex M1102A Power Supply module provides maximum output power for other Maxiflex
modules via the Maxiflex base (+12V dc at 2A and +5V logic at 5A). A +5V dc pre-charge supply
is also provided on the base to allow insertion and removal of other modules while the system is
live.
The M1102A can be used with any Maxiflex base except the M1031A 5 I/O Expander Base which
does not require a power supply.
The M1102A is a 50W power supply with an input of 20V to 36V dc. The output power is split
between the +12V (on the base) and the +5V (on the base), and will cater for a fully populated
Maxiflex base under worse case conditions.
All connections to the module are made via the screw terminals located behind the door on the
front of the module. These terminals are removable for maintenance purposes, without disturbing
the field wiring.
The M1102A generates “PFAIL” status signal (active low) which indicates to the CPU that the
input voltage has fallen below a preset level (18,5V).
When the input supply rises above 19,5V dc (as compared to 18,5 for failure), all signals will
return automatically to their normal state prior to DC supply failure.
This information, like all other I/O data, is available on the network to the supervisory system.
Table 1 : LED indications
LED
Colour
Description
Power
Green
5V and 12V supplies OK
Shutdown
Red
Overvoltage on the 5V dc or the 12V dc
Two LEDs located behind the LED cover of the module are only visible when they are on. Refer
to section on Field Test Procedure for field diagnosis using the LEDs.
