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C–6 MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL
INTERNAL DC DUAL-SOURCE POWER INPUT OPTION CHAPTER C: INTERNAL DC DUAL-SOURCE POWER INPUT OPTION
This section describes the proper connection of the -48VDC, 12VDC, 24VDC, 125VDC and
250VDC dual source leads to the power terminal block on the Multilink ML1200 Switch
(shown in Figure to the above)
The terminal block is located on the left front of the unit next to the Alarm terminal block
and is equipped with four (4) screw-down lead posts. The primary terminals are identified
as positive (A+),
negative (A-), and the secondary power terminals as negative (B-), positive(B+). The chassis
is earth/ground (GND). The Dual Source terminal block for the 12, 24, 48, 125 and 250VDC
are the same.
The GND should be hooked up first. The ML1200 unit has a floating ground, so the user
may elect to Ground either + or = terminal to suit the customer’s use. Before connecting
live power lines to the terminal block, always use a digital voltmeter to measure the
output voltage of the power supply and determine the lead which is more “+ve potential”.
The more “+ve” voltage lead from a +ve or –ve power supply must be connected to the
post labeled “+”.
The connection procedure is straightforward. Simply connect the DC leads to the Switch’s
power terminals, positive (+) and negative (-) screws. The use of Ground (GND) is optional; it
connects to the Switch chassis. Ensure that each lead is securely tightened.