12
OPTIONAL SAFETY FEATURES
"Press to Operate" (PTO) Safety Switch
To release a crane/machine load, it may be necessary
to incorporate a two-handed activation with a "Press to
Operate" (PTO) safety switch. The PTO switch must be
activated at the same time the load release switch is
activated. This feature ensures that the load is not
released by incidental activation of the release switch.
Typical applications for a PTO switch are magnetic and
vacuum lifting devices or grabs of any type.
A PTO safety switch can also be incorporated into a
joystick as a button on top of a joystick lever.
"Lift to Operate" (LTO) Joystick
"Lift to Operate" (LTO) joysticks have a mechanical
device located near the top of the joystick handle. It
must be held and lifted upward to activate the joystick.
LTO ensures that the joystick is not accidentally
activated. This feature is available on GR transmitters.
"Lift to Operate" (LTO) Toggle Switch
LTO toggle switches must be lifted from their static
positions in order for the switch to be activated. LTO
toggle switches can be "maintained" or "momentary".
This feature is mechanically activated and is available
on Nova, GL, and GR transmitters.
Tilt Sensor Switch
The tilt sensor switch activates if the transmitter is tilted
more than 30 or 45 degrees from level. The switch has
a delay time of 0-5 seconds.The delay time is set at the
factory to customer specifications. If this switch senses
an unacceptable tilt for as long as the time delay is set,
the transmitter either sends the E-stop signal to the
receiver or enables/disables certain functions
according to customer specifications. This safety
device is useful if the operator is in danger of losing his
footing or control of the transmitter. It is available on GL
and GR transmitters.
Range Limitation
This feature uses a RF signal to restrict operator
movement to a predetermined range limit. It can be
preset at the factory, or adjusted in the field.
Interlocking Functions
This feature prevents contradictory operator
commands from the transmitter. Certain functions can
be enabled or disabled when another function is
activated or inactive. An example is hoist up and hoist
down. Activating both functions would most likely
damage the equipment. Therefore, hoist up is
interlocked with hoist down so that when one is
activated the other can not be. The systems are
capable of interlocking any functions.
Magnet Switch
The magnet switch is used mainly in transmitter
docking station situations. Its function is to enable
certain functions only when the transmitter is secured
in a predetermined location.
Corrosion Protection
To resist damage in corrosive environments, all metal
components are fabricated of stainless steel. This can
include receiver housings, hardware, screws, etc.
Solid State DC Outputs
This feature enables Hetronic to eliminate costly
intermediate relay panels for DC crane/machine
operations. There are no moving parts in the
contactors, thereby lowering maintenance costs.
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