GarrettCom Magnum 6K8 Hardware Installation And User's Manual page 75

Magnum 6K8-Series Industrial Field Switch
absent, or even if it is connected with reverse polarity or shorted or grounded.
d) Reverse polarity connections, if they should accidentally occur on either input, will not damage
the Switch or power supply internally (nor will it blow the fuse in the internal power supply)
because of the blocking action of the diodes. This is true even if one input connection is
reversed while the Switch is operating from the other source.
e)
The Switch will not receive power (and will not work) when both inputs are simultaneously
absent or are both incorrectly connected.
C5.0 INSTALLATION
This section describes the proper connection of the
-48VDC, 24VDC and 125VDC dual source leads to the -
48VDC, 24VDC & 125VDC power terminal block on the
Magnum 6Ks Switch as shown in Fig.
The -48VDC terminal block on the Magnum 6K8-Series Switch, as shown in Fig C5.0 is
located on the left front of the unit
and is equipped with five (5)
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 "earth" or ground (GND) is
a threaded post with a #6 nut. The Dual Source terminal block for the 24VDC and
125VDC are similar. Figure C5.0: -48VDC-Dual-Src, wiring connections to the
External Terminal Block on a Magnum 6K8 -48VDC
Note: The GND should be hooked up first. The 6K8-Series unit has a floating ground,
so the user may elect to Ground either + or - terminal to suit the customer's use.
Before connecting hot lines to the Terminal Block of –48VDC, 24VDC or 125VDC,
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 "+".
The connection procedure is straightforward. Simply connect the DC leads to
the Switch's power terminals, positive (+) and negative (-) screws. Ensure that each lead
is securely tightened.
The 24VDC & 125VDC terminal block on Magnum 6K8-Series's is similar to
that described in the –48VDC information above.
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Installation and User Guide (04/07)
DC Terminal
70