Bunn Ultra NX Service & Repair Manual page 53

SERVICE - RIGHT SIDE PANEL COMPONENTS
Tri-Output Power Supply
1 2 3 4
FIG. 37 PN: 33363.0019 POWER SUPPLY
Location:
The Tri-Output power supply may be found in custom-
er specific dispensers. The Tri-Output power supply
is located behind right side panel and mounted to
the side frame above the capacitors.
Right Panel Removal:
1. Loosen 2 right side panel screws on the
underside of the machine.
2. Grab and lower the right panel while pulling the
bottom outward to remove panel.
Test Procedures:
NOTE: The power supply accepts incoming
88-264VAC and steps down and coverts the
voltage to three outputs, 5VDC,24VDC and 12VDC.
The power supply has an LED power indicator.
1. Check power supply L & N terminals for
incoming AC power.
No AC power or power LED illumination, check
power source for power before replacing power
supply.
Yes AC power on L & N power supply terminals.
2. Check the three VDC Output (V1, V2 & V3)
terminals to DC common output terminal 7 on
the power supply.
V1 = 5VDC - Terminal 8 -Not Used
V2 = 24VDC - Terminal 6
V3 = 12VDC - Terminal 5
Terminal 7 - DC Common Output (Negative)
No DC power, replace power supply.
5 6 7 8
Part Removal and Replacement:
1. Disconnect power supply to the machine.
2. With right side panel removed, locate the
power supply.
3. Loosen 2 key lock screws securing power
supply to the machine frame.
4. Pull power supply with screws out of the ma-
chine key holes. Finish removing the screws
from power supply and retain screws.
5. Note the position of wire/colors on the power
supply terminals.
6. Disconnect wires from the power terminals.
discard power supply.
7. Install screws retained in step 4 into the
replacement power supply.
8. Reconnect wires to the Tri-Output Power supply
terminals.
Terminals 1 thru 8:
1 - L = Line AC – Black wire
2 - N = Neutral AC – Solid white wire
3 - Ground = Green wire to chassis ground
4 - NC = No Connection
5 - V3 = 12VDC - Red wire power to IOT
6 - +V2 = 24VDC to Ultra NX – White with
blue stripe
7 - COM = Common/ground – White with black
stripe to Ultra NX, Green jumper to
ground, Black negative to IOT.
8 - +5V = Not used
NOTE: Ensure green jumper wire is installed
into terminal 3 & 7 on the power supply. The
purpose is proper grounding for the level probes
to operate correctly on Ultra Autofill models.
9. Install power supply with screws back through
the machine mounting key holes and tighten.
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