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Troubleshooting Basket Speed Errors on Single-motor Washer-extractors
PELLERIN MILNOR CORPORATION
Table 1: Model-Specific Data
Machine Model
Maximum
Frequency
Maximum
Wash RPM
Counts per RPM
(C/RPM)
Offset (D)
30022F_W
30022X_W
155 40
36030F_S 186
36030F_W 205
43
42026V_W 155
42032F_S 178
42032F_W 195
40
5
48040F_W 38 6
68036F_N
170
32 7
15
Important: Values shown are subject to change without notice. Contact Milnor
Customer Service for verification.
Note 1: The counts and offset values are configurable in controller software WUWESME, used in single-
motor E-style and divided cylinder washer-extractors. Contact your dealer or the Milnor service department
for assistance with these machines.
Display or Action Explanation
10:38 F0005S03 02:37
0195 RPM=A029/D030
The rightmost number of the bottom line indicates the desired
(programmed) basket speed for this step. This value matches the
value programmed in the wash formula.
10:38 F0005S03 02:37
0195 RPM=A029/D030
The middle number of the bottom line indicates the current
calculated basket speed. Input/output board #1 determines the
time between each main pulley spoke passing the photoeye and
reports this data to the processor board at each communication
cycle, which is usually more often than once per second. The
processor board filters the raw data from the input/output board
and displays the most recent valid value.
Tip: Large variations in the achieved RPM value are possible early in extract steps because the valid
range includes values from 0 RPMs to the maximum extract RPM of the machine. These
variations have no effect on how the machine operates because of the frequency with which new
data is reported.
4. Verify Output Voltage of D-to-A Board
If the microprocessor is displaying the correct calculated digital value, the next step is to verify
that the digital-to-analog board is putting out the appropriate signal voltage.
1. Calculate the voltage of the signal that the D-to-A board should deliver to the inverter:
V
d
= C
d
/ 409.5
Where:
V
d
= Desired voltage
C
d
= Desired counts per RPM
For example, assume the machine is configured as a 48040F_W and the desired wash speed
is 24 RPMs.
a. From Table 1, we see that this machine model makes six counts per revolution and has an
offset of 15.