Welbilt FB081TF, Service Manual

Page: 65 / 96

Part Number REV00 04/08/2020 65
Control System
ON/OFF ROCKER SWITCH
Location
The ON/OFF switch is located on the left side of the unit
when viewing from the front.
Function
Supplies power to the Blender components. Turns unit ON
and OFF.
Specification
This is a rocker switch with a double pole, double throw
switch.
Check Procedure
To check the switch, unplug the power supply to the
equipment.
1. Check for loose or broken wires at that terminal.
2. Remove the wires (marked #14) and with your ohm
meter check continuity between (2) two terminals in
the ON position.
3. There should be continuity.
4. If no continuity is read, replace the switch.
5. Press the switch to the OFF position (O).
6. Check continuity between the (2) two terminals, there
should be no continuity between the terminals.
7. If continuity is read, replace the switch.
POWER RELAY
Location
Located behind the left-hand side panel.
Function
Removes full load amperage of components and motors
from ON/OFF rocker switch.
Specification
Double Pole Single Throw (DPST), 220 VAC coil, average coil
resistance 21 KOhms, Contact rating - 30A @ 120 VAC. When
energized, contacts close and allow power to flow to SRB
board (J9 & J10), Power Supply (CN1), and Evaporator Fans.
Check Procedure
There is a small black manual push button on the relay body
to allow testing of the contacts with the unit de-energized.
Disconnect the wiring to the contacts and check resistance
while pressing the test button. The resistance across the
contacts should be less than 1.0 ohms.
• Manual Test Button, Press to close contacts.
If the relay is energized and contacts are closed the button
will be pulled in, flush with the body of the relay.
Power Relay Coil Test Procedure
1. Check the coil using an ohm meter, the coil should
have a nominal resistance reading. If no reading the coil
is open and the Power Relay should be replaced.
2. With the ON/OFF rocker switch in the ON position,
check for line voltage at relay coil.
• Line voltage present - Contacts should be
closed, if not replace the relay.
• No line voltage present - Refer to ON/OFF rocker
switch check procedure.
Section 7
Component Check Procedures