Tennant 7100, Service Manual

Page: 259 / 305

ELECTRICAL
4-91
7100 330695 (8 − 11)
SCRUB PRESSURE DOWNSHIFT FEATURE
This machine has a scrub pressure downshift
feature. This feature is designed to protect the
scrub actuator in the event that the scrub brushes
cannot be loaded enough to satisfy the minimum
currents for downpressure 2 or 3.
This feature will be invoked automatically if the
circuit board detects a stall condition for the scrub
head actuator while adjusting down to meet the
minimum current condition. When in this mode,
the controller will reload the scrub pressure levels
to the next lightest down pressure.
1. If the machine is in down pressure 3, the
system will downshift to down pressure 2.
2. If the controller cannot meet the minimum
current to down pressure 2, it will downshift
to down pressure 1.
3. The current down pressure level is indicated
using blinking LED’s. If the machine was
operating in downpressure 3 and downshifts
to downpressure 2, all three LED’s will be lit,
and the lower two will blink.
4. If the system downshifts to downpressure 1,
the lowest down pressure LED will blink.
This system will reset itself each time the
machine goes into neutral. If the system had
downshifted into pressure 2 and the machine
goes into neutral, the original down pressures will
be re − loaded, and the panel LED’s will go into
there normal non − blinking state.
SQUEEGEE BUTTON
Pressing the squeegee button will start or stop the
water pickup operation. If the operator presses
the squeegee button while the squeegee LED is
currently not illuminated will cause the following
actions:
1. The squeegee LED will be illuminated.
2. If the machine is not in reverse, the
squeegee will drop and the vacuum fan will
turn on . If the machine goes into reverse
while the squeegee is active, the squeegee
will rise. If the machine remains in reverse
long enough, the vacuum fan will shut off.
Pressing the squeegee button while the squeegee
LED is on will cause the following actions:
1. The squeegee LED will turn off.
2. The squeegee will raise.
3. The vacuum fan will turn off after a slight
delay.