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Chapter 2
power/life of the lead-acid type. An optional conversion kit for using two
(2) 12-volt, 7-amp hour sealed lead-acid gel cell batteries is also available.
The ADFM will operate from an external DC power supply of 12 to 35
volts, with a power consumption of 3 watts maximum. A supply voltage of
24 to 35 VDC is recommended to allow operation from the internal batter-
ies when the external power supply is interrupted. Operation from external
mains (AC) power requires a power source of 115 or 230 VAC, ±10%; 50 to
60 Hz, with a power consumption of 5 VA maximum.
Line Voltage Selection
The ADFM should be delivered pre-configured for the proper voltage. The
current configuration will be indicated by a sticker on the exterior of the
Electronics Unit adjacent to the AC input connector. Before applying mains
power, verify that the ADFM is configured for the correct line voltage. If
the ADFM is configured for the wrong voltage, please contact MGD Tech-
nologies Inc. for instructions.
Mains (AC) Power Cable
CAUTION. BEFORE CONNECTING THIS INSTRUMENT TO MAINS, the
protective earth (ground) terminal of the instrument must be connected to
the protective conductor of the mains power cord. The mains power cable
must be connected to a protective earth contact. The protective action
must not be negated by use of an extension cord (power cable) without a
protective conductor (grounding). Grounding a two-conductor outlet does
not provide an instrument ground.
This instrument is provided with a three-conductor power cable for mains
supply. When connected to an appropriate power outlet, this cable grounds
the instrument unit. The mains power supply cable normally ships as a pig-
tail assembly for field wiring to the mains power supply. The connector on
the cable mates with the left-most receptacle on the ADFM, and that is the
only receptacle it will mate with. Wiring assignments for the mains power
cable are as follows:
Pin
(L)
1
(N)
2
(PE)
3
DC Power Supply Cable
This instrument is provided with a two-conductor cable for DC power sup-
ply. This cable provides no grounding. The DC power supply cable nor-
mally ships as a pigtail assembly for field wiring to the DC power supply.
page 2-4
Color
Function
Brown
Line
Blue
Neutral
Green
Protective Earth
MGD Technologies, Inc.
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