When one of the following booms is lifted/extended:
▪ pantograph
▪ upper boom
▪ telescopic boom
One or more M1A, M1B, M1E microswitches are activated
and consequently an automatic control activates the pot-
hole guards, whose fully lowered position is checked by
MPT1 and MPT2 microswitches. Pot-hole guards
activation depends on the position of the rotating turret
monitored by the PS1A-PS1B sensors. According to the
picture above:
- In the NO POT-HOLE AREA zones the pot-hole
guards are activated;
- In the NO POT-HOLE AREA zones the pot-hole
guards are activated;
Annually check the operation of the MPT1-MPT2
microswitches and of the PS1A-PS1B sensors
The functions of the MPT1-MPT2 microswitches are the
following:
▪ PS1A-PS1B sensors monitor the position of the
rotating turret defining the "POT-HOLE AREA" and
"NO POT-HOLE AREA" zones as shown in the
picture above.
▪ With platform not in rest position (at least one of the
M1A-M1B-M1E microswitches is activated) if the
turret is in the POT-HOLE AREA zone if both pot-hole
guards are fully lowered the MPT1-MPT2
microswitches are "free" and drive is allowed at safety
speed. Conversely, if one or both microswitches
MPT1-MPT2 remained activated it means that one or
both pot-hole guards are not in the correct position
and drive (with raised platform) is disabled; the alarm
condition is reported to the operator by the danger red
light on the platform.
▪ With platform not in rest position (at least one of the
M1A-M1B-M1E microswitches is activated) if the
turret is in the NO POT-HOLE AREA zone if both pot-
hole guards are fully lifted the MPT1-MPT2
microswitches are "not free" and the drive is allowed
at safety speed. Conversely, if one or both
microswitches MPT1-MPT2 remained activated it
means that one or both pot-hole guards are not in the
correct position and drive (with raised platform) is
disabled; the alarm condition is reported to the
operator by the danger red light on the platform.
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