Milnor BICWUT01 - Manual (Page 6)

Troubleshooting Basket Speed Errors on Single-motor Washer-extractors
PELLERIN MILNOR CORPORATION
Display or Action Explanation
F01 T MMQFFFHC3WLL S
S01 2 050150133110 0
The first page of step decisions includes the type and duration of
the step, the desired temperature, water valves, fill action, bath
level, and steam code.
u Press u several times to advance to the second page of
decisions.
F01 CCNNWSSS* RPM DRC
S01 000000000- 3 0000
The second page of step decisions includes the prompt for the
desired basket speed. If the value shown here is not the desired
value, change it. The complete procedure for programming a
wash formula is described in the reference manual for your
machine.
2.
Verify Inverter Parameters
The machine processor board adjusts the speed of the motor by communicating with the inverter.
The inverter contains several values, called constants or parameters, that control how the inverter
interprets signals from the machine processor. These parameters were programmed into original
equipment inverters at the Milnor factory before the machine was shipped, but replacement
inverters must be programmed with the correct constants for machine type, inverter type, and
voltage. If these parameters are incorrect, the inverter will not work as expected.
The procedure for verifying the inverter parameters varies among inverters, but is described in
detail in the documentation provided by the inverter manufacturer. Replacement manuals for
several inverter models are available at
http://www.drives.com
.
Inverter constants for specific inverters and Milnor machine models are available in the Customer
Service area of
http://www.milnor.com
.
3.
Verify Digital Value of Programmed Speed
If the desired value is correctly programmed, view the speed diagnostics to verify that the
machine controller is commanding the programmed speed. The machine must be running a step
in which the speed is wrong.
Supplement 1
Creating a Test Formula
When a wash step begins, the beginning value sent to the inverter is calculated according to this
equation:
V
0
= [RPM
d
* (C/RPM)] + D
Where:
V
0
= beginning value sent to inverter
RPM
d
= Desired basket speed in RPMs
C/RPM = Counts per RPM
D = Offset
If all motors, inverters, and digital-to-analog boards could be manufactured to exactly the same
specifications, adjustment of the basket speed would not be necessary. However, manufacturing
tolerances allow minor variances in these components, so a feedback system is used to monitor
the basket speed and make adjustments to achieve the desired value.
If a speed adjustment is required during a wash step, the machine controller signals the inverter