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40
timer as needed, and be sure to disable the alarm (Menu 5 set to zero [
]) to prevent tripping 
the No-Convey alarm 
Er.1
 
Menu 
2  Number of Blowback Pulses 
0 to 16 Pulses, Default = 4 Pulses 
The Number of Blowback Pulses menu lets you: 
 
•  control the number of blowback pulses discharged from the 
compressed air solenoid during the hopper dump sequence 
•  increase the number of pulses if the material conveyed exhibits 
bridging problems or otherwise dumps slowly 
•  decrease the number of pulses to optimize the cycle time and 
increase throughput when conveying free-flowing material 
 
 
Menu 
3  Percentage of Material B 
0 to 100 Percent, Default = 0 Percent 
PP Models Only 
The Percentage of Material B menu lets you increase or decrease the percentage of 
Material B in the proportioning cycle. 
Menu 
4  SPV Total Cycle Time 
0 to 60 Seconds, Default = 30 Seconds 
PP Models Only 
The SPV Total Cycle Time menu lets you: 
 
•  control the duration of a complete proportioning cycle—this time is 
not the same as the vacuum time; the vacuum and proportioning 
timers operate concurrently as shown in Figure 10. 
•  decrease the SPV total cycle time to increase the layering of the 
two materials in the hopper loader as it fills 
•  increase the SPV total cycle time to reduce the layering of the two 
materials in the hopper loader as it fills 
 
Example:  If the percent of Material B (Menu 
3
 )  is set at 20% and the SPV 
total cycle time (Menu 
4
 ) is set at 40 seconds, Material B 
conveys for twenty percent (20%) of 
40 seconds, or eight (8) seconds. Material A conveys for the 
remaining 32 seconds.