GE MULTILINK ML1200 - Manual (Page 335)

CHAPTER B: DC POWER INPUT DC POWER INPUT
MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL B–5
B.4 ML1200, -48 V, 24 V, 125 V DC Installation
This section describes the proper connection of the -48VDC leads (or 24VDC / 125VDC
leads) to the DC power terminal block on the Multilink ML1200 Switch. The DC terminal
block on the Multilink ML1200 Managed Switch is located on the left front of the unit and is
equipped with four (4) screw-down lead posts. The power terminals are identified as
positive (+) and negative (-), and they are electrically floating inside the unit so that either
may be grounded by the user if desired. The chassis is “earth” or ground (GND).
The connection procedure is straightforward. Simply insert the DC leads to the Switch’s
power terminals, positive (+) and negative (-) screws. The use of Ground (GND) connects to
the Switch chassis screw provided under the DC terminal. Ensure that each lead is securely
tightened.
Note Always use a voltmeter to measure the voltage of the incoming power supply and figure
out the +ve potential lead or -ve potential lead. The more +ve potential lead will connect to
the post labeled “+ve” and the rest to the “-ve”. The GND can be hooked up at the last.
When power is applied, the green PWR LED will illuminate.
Note 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 of –48VDC, 12VDC, 24VDC, 125VD
or 250VDC products, 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 48V or –48V supply must be connected to the post labeled “+”.