Figure 2.18 Vdc Polarity Check - Bard D25A2PA Installation And Service Instructions Manual

If the VDC wiring is not terminated correctly on the specific polarity-indicated terminals of the VDC terminal
block, the VDC controls and motors will not activate and the wall-mounted unit will not function.
Bard System
Supply Breakers
Step 1
Multimeter set to VDC:
Display reveals "0" voltage potential
Step 2
Multimeter set to VDC:
Positive-to-ground reveals
"0" voltage potential
Step 3
Multimeter set to VDC:
Negative-to-ground reveals
"-48" voltage potential
FIGURE 2.18
VDC Polarity Check
+
Shelter VDC Power Supply
-48VDC, Positive Ground
Bard System Supply Breakers:
VDC breaker in OFF position
Bard System Supply Breakers:
VDC breaker in OFF position
Bard System Supply Breakers:
VDC breaker in OFF position
0 VDC
Shelter VDC Power Supply
-48VDC, Positive Ground
0 VDC
Shelter VDC Power Supply
-48VDC, Positive Ground
-48 VDC
Shelter VDC Power Supply
-48VDC, Positive Ground
Manual 2100-643C
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