Revision 1
I.
Machine Control
A.
Control Devices
Control devices found on the Control Panel have a fundamental impact on safety, because at
least a portion of them are able
to
initiate machine motion. For this reason, it is essential that
every person who comes into contact with this equipment must have a basic grasp of their
functions.
The following are brief descriptions
of
the push buttons, pilot lights, selector switch, and
float switch that will be encountered on this equipment:
1.
Push Buttons
Push buttons are a type of electrical switch used
to
provide interface between operator and
high pressure water jetting unit controls.
2.
Pilot Lights
Pilot lights give a quick visual indication of equipment status. Because of this function, they
often serve as a very important trouble-shooting tool.
Pilot lights are equipped with a "push
to
test" feature. Depressing a pilot light's lens will cause the pilot light
to
illuminate
if
the
pilot light is in proper working order. A pilot light can only be tested when the high pressure
water jetting unit is running.
3.
Push Button Pilot Lights
A push button pilot light is a combination
of
a push button and a pilot light which
illuminates for a fault condition.
4.
Selector Switch
A selector switch provides mode selection capability, e.g., "Warm Engine I Run Engine".
This is a maintained contact device.
5.
Float Switch
A float switch is a device designed for automatic control of a liquid in an open or closed
reservoir. A float attached
to
an
arm extending off the switch activates the switch when the
liquid level raises or lowers. The float switch on the high pressure water jetting unit is used
to
indicate a low water condition.
© Copyright November, 1999 NLB Corporation
4-2
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