Replace Transformer - Graco Therm-O-Flow 20 Instructions - Parts Manual

Repair

Replace Transformer

See F . 35, page 59.
IG
1. Turn the Main Power Switch OFF.
2. Open the electrical enclosure door.
3. Disconnect the incoming power harness (234) from
the top of the Transformer (235).
4. Disconnect the Transformer (235) output power
harness wires (CR2-W1, -W2, -W3, -W4) from CR2.
5. Disconnect the Transformer (235) ground wire from
the back panel ground lug.
6. Disconnect the red (+) and black (-) wire of the fan
from pins 4 and 3 of the J7 connector on the AWB
(205). Disconnect the J7 connector from the AWB.
7. Cut the wire zip ties securing the fan wires.
8. Remove the flanged nuts (N) and Transformer (235)
from the back panel (201).
9. Install the Transformer (235) onto mounting studs
on the back panel (201) and secure with flanged
nuts (N).
10. Insert the thermal sensor connector from the
Transformer (235) onto the J7 connector on the
AWB (205).
11. Reconnect the red (+) wire from the fan into pin 4
and the black (-) wire into pin 3 of the J7 connector.
12. Install the Transformer (235) ground wire onto the
ground lug of the back panel (201).
58
13. Connect the Transformer output power harness
(234) to the power terminal connections. Torque to
25–27 in-lbs (2.8–3.1 N•m).
Table 11 Transformer Output Power Harness
Connections
Power Harness Wires
CR2-W1
CR2-W2
CR2-W3
CR2-W4
14. Install the incoming power harness (234) to the top
of the Transformer in the voltage port specified on
the machine serial number label.
15. Verify all electrical connections, including earth
grounds, are complete and tight. All connections
and plugs must be connected prior to applying
power.
16. Close the Electrical Control Panel door.
17. Apply power to the machine. Turn on the Main
Power Switch.
18. Restart the system.
CR-2 Connections
Terminal 1
Terminal 3
Terminal 5
Terminal 13
334129S