Use and maintenance manual Self-propelled aerial platforms Page 52
7.2.9
Operation check of safety microswitches
Some microswitches are placed in strategic positions to check the different configurations of the machine and activate safety
functions. Their activation implies visual indication through the warning lights located on the platform control station (see
relevant chapter).
The check of the actual operation of the microswitches should be carried out at least every year.
7.2.9.1
Microswitch M1
The microswitch M1 on the chassis checks the position of the lifting structure. With platform completely lowered the
microswitch M1A is not activated.
With lifted platform (with some tolerance due to the type of activation of the microswitch), the microswitch M1 is activated and:
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if the chassis is inclined over the max. allowed inclination the lifting and drive controls are inhibited and:
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the danger warning light (S – Fig.5) and danger audible alarm turn on;
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the drive enable warning light (R – Fig.5) turns off;
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the lifting enable warning light (T – Fig.5) turns off;
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the safety drive speed is automatically activated;
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when platform is overloaded ALL operations until removal of overload are inhibited and:
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the overload warning light (U – Fig.5) and danger audible alarm turn on;
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the drive enable warning light (R – Fig.5) turns off;
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the lifting enable warning light (T – Fig.5) turns off;
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the levelling cylinder control is inhibited (if available).
7.2.9.2
Microswitch M1S (if available)
The microswitch M1S on the chassis checks the position of the lifting structure. The activation of the microswitch M1S stops
the drive control at a given platform height from the ground and turns off the drive enable warning light (R – Fig.5).
Not all machines mentioned in this manual have a microswitch M1S; check in the chapter “TECHNICAL FEATURES” if the
maximum drive height is different from the maximum height that the platform can reach.
7.2.9.3
Microswitch M3 (OPTIONAL)
The microswitch M3 (OPTIONAL) on the chassis checks the position of the lifting structure. The activation of the microswitch
M3 stops the lifting movement (lifting microswitch) before reaching the lifting cylinder stop and turns off the lifting enable
warning light (T – Fig.3).
7.2.9.4
Microswitch M5
The microswitch M5 on the platform checks the position of the extensible part. When the deck extension is not fully retracted,
the microswitch M5A is activated and:
-
On machines with variable capacity (see chapter “TECHNICAL FEATURES”) the reduced load control is activated (the
max. allowed capacity at platform is reduced to the max. allowed capacity with extended deck).
