Issue 9 February 2006
19
2.4.5 Setting impeller/brush speed
To your left hand side are the two levers shown on the picture.
Use the left hand side lever to set the brush rotation speed. The
brush speed should be set to the minimum speed necessary to
provide clean sweeping for the forward speed being used.
Use the right hand side lever to set the impeller rotation speed. This
is the only way you can set the impeller speed (the IQAN only
displays the current speed)
The vacuum fan impeller speed should be set to below 2500 rpm for normal sweeping.
The speed can be set to above 2500 rpm (boost) for a short time (up to 5 minutes). When in boost the
machine management unit (MMU) will display a countdown bar graph. If the speed is not reduced to under
2500 rpm within 5 minutes, the MMU will shut off the fan and a buzzer will sound. To reset the MMU fan
speed limiting system the machine must be stopped and Forward/Neutral/Reverse switch moved to the
Neutral position for at least 5 seconds. The machine can then be re-started and the impeller speed reduced to
below 2500rpm.
The MMU will restrict boost to a maximum of 5 boost periods per hour.
To turn the impeller on/off while sweeping, use the appropriate column switch
For normal sweeping the impeller speed does not need to be greater than 2400 rpm.
The machine may be operated for short periods of time with the impeller above this speed (up to 2800 rpm)
but if impeller speeds greater than 2400 rpm are continually required then the machine is being over-tasked
or has a blockage (see section 7 – fault finding).
