Milnor MWR09E5 Series General Operating And Troubleshooting page 49

Display or Action
The goal in testing outputs is to verify that the specified device operates when the controller
commands it to operate. Some devices, such as water valves and chemical injections, cause a
result that can be seen or heard (water or chemical entering the machine). Others, especially drain
and extract speed commands, can only be verified with the proper use of a voltmeter. Use the
information below and the electrical diagrams for this machine to test a component.
Door Unlock button (Output 00)—When this output is enabled, it remains enabled for two
seconds before it turns off. While enabled, this relay enables relay CRD to lock the door. The
Door Unlock button (
energize.
Drain Speed inverter signal (Output 01)—This output signals the inverter to run the motor at
drain speed. However, both the clockwise wash signal and the drain speed signal must be
present for the basket to turn. Test this output relay (K01) by checking for a signal of 24 volts
DC between pins 7 and 8 of MTA5 when the relay should be off, dropping to 0 volts when the
relay should be on.
Drain Closed (Output 02)—This output relay closes to energize the normally-open drain valve,
causing it to close. Test relay K02 by observing the drain valve under the machine or by
checking for control voltage between fuse EF71B and pin 3 of MTA5 when the relay should
be closed (drain closed), dropping to 0 volts when the relay should be open (drain open).
Hot Water Valve On (Output 03)—This output relay closes to energize the normally-closed hot
water valve, causing it to open. A voltmeter should indicate control circuit voltage between
fuse EF71B and pin 1 of MTA5 when the valve is open and hot water is flowing into the
machine, dropping to 0 when the valve is closed.
Cold Water Valve On (Output 04)—This output relay closes to energize the normally-closed
cold water valve, causing it to open. A voltmeter should indicate control circuit voltage
between fuse EF71B and pin 9 of MTA4 when the valve is open and cold water is flowing
into the machine, dropping to 0 when the valve is closed.
CAUTION 18 : Entanglement hazard—The machine basket rotates when output 05 or 06 is
actuated.
• Keep all personnel clear of the motor and drive components when testing these outputs.
Clockwise Wash Speed inverter signal (Output 05)—This output signals the inverter to run the
motor clockwise at wash speed. Test this output relay (K05) by checking for a signal of 24
volts DC between pins 7 and 8 of MTA4 when the relay should be off, dropping to 0 volts
when the relay should be on.
Counter-clockwise Wash Speed inverter signal (Output 06)—This output signals the inverter
to run the motor counter-clockwise at wash speed. Test this output relay (K06) by checking
for a signal of 24 volts DC between pins 3 and 4 of MTA4 when the relay should be off,
dropping to 0 volts when the relay should be on.
Explanation
Press and release this button to turn off the current output and
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select and actuate the next one. For example, if the display says,
"Output #3 is On," press
output 3 and turn on output 4. The display then shows, "Output
#4 is On."
Hold this button depressed to automatically cycle through all 16
outputs. As described above, only one output is actuated at any
time. The display will turn each output on for approximately one
half second, then advance to the next output in numerical order.
) must be held depressed while testing this output or it will not
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Chapter 4. Testing and Troubleshooting
one time and release it to turn off
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PELLERIN MILNOR CORPORATION