Snorkel SP22 - Manual (Page 29)

Chapter 5. Shut-offs and Circuit Breakers
■ Automatic Shut-offs
❑ Engine temperature (Cummins engine)
There is a temperature sensor in the engine. It
measures the temperature of the antifreeze-water
mixture as the mixture leaves the top of the radiator
and enters the top of the engine.
If the temperature reaches 210 0 F (99 0 C) an alarm
sounds. If the temperature continues to rise, the
engine shuts off when the temperature reaches
230
0 F (110 0 C).
The engine will not restart until the temperature
drops below 210
0 F (99 0 C).
❑
Engine temperature (Deutz engine)
The Deutz engine is oil cooled therefore it is the oil
temperature that is monitored.
Should the engine oil temperature exceed 130 0 C
the engine will shut down automatically.
It will restart but will be shut down again unless the
oil temperature returns to normal.
❑
Engine oil pressure
There is an oil pressure sensor in the engine. It
measures the engine oil pressure at the oil filter.
If the pressure falls below a safe operating value
the engine shuts off.
The engine will restart with low pressure but it will
only run a few seconds before it automatically
shuts off again.
❑
Dynamic brakes
When you drive an SP down a slope, if the SP
begins to coast (outrun the drive motors) the
hydraulic system “senses” the coasting condition.
The hydraulic drive motors then become hydraulic
brakes and the SR is slowed. This action prevents
SP’s from speeding down grades.
❑
Platform height vs. drive speed
When the platform is raised above horizontal the
drive speed is limited to its slowest speed and the
engine revs are also automatically lowered.
❑
Axle lockout
The articulating axle will automatically “lock” when
the boom is extended beyond 50% and the column
is slewed out over the side of the base.There is a
warning light in the platform control box (Refer to
Figure 5.1) that indicates when the axle is in the
locked position.
Figure 5.1—Axle Lockout Indicator Light
■ Circuit Breakers
❑ Main circuit breakers
There are three circuit breakers, on the SP. These
are located inside the lower control box (Refer to
Figure 5.2). Their purpose is to protect the
electrical circuits from electrical overloads. When a
circuit breaker trips (pops out) push it back in then
attempt to use the SP.
If the circuit breaker trips a second time, take the
SP out of service and refer the problem to a
qualified trained service technician for repair.
Figure 5.2—Circuit Breakers
❑ RCD / ELCB
The RCD (Residual Current Device) is located at
the ground and will protect against short circuits to
earth (Refer to Figure 5.3). When there is a short
circuit the RCD will shut down the 230v AC power
to the platform outlet.
SP20/SP22 – 11890A page 5 - 1