7.2.3 Double Jog Enable (DJE) (LRC OCUs only)
In a DJE system, the motion joystick and paddles are prevented from operating on the first deflection. This means
that from an off state, any accidental deflection will not result in the motion being activated and the operation is
protected.
• Activation Sequence
– When turning on the controller, all joysticks are disabled
– In order to enable all the joysticks, any of the joysticks must be deflected, brought back into zero and
then deflected again in less than a configurable time of between 500 ms (minimum practical) and 3
seconds, in 500 ms increments; otherwise, all the joysticks remain disabled
• Operation
– Once the joysticks are enabled, they remain enabled until all joysticks are returned to neutral for a
period of time greater than a configurable period between 1 and 30 seconds (short configured times
are advised)
• Indication
– The respective status of the joysticks is indicated by a separate LED driven from two of the LED
outputs to create the following sequence of colors:
Green: Joysticks disabled
Red: Joysticks enabled
Orange: During initial enabling sequence
• Pros
– Easy to use
– Protects against accidental activation before the motion is enabled
• Cons
– Once activated, if an additional lever is accidentally deflected, protection will require removal of the
deflecting mechanism or pressing the Stop button
7.2.4 Vigilance
The Vigilance function is an optional feature and is another method of maintaining the system in an active state; it
is available for any LRC controller.
This method requires the operator to repeatedly activate a switch before a software timer expires.
As an example, an operator may be required to activate a toggle switch every 30 seconds or less. If the operator
fails to reset the toggle switch, a warning is issued for 10 seconds. During this period the operator can still reset
the vigilance function, but if this period times-out without resetting, the OCU shuts down.
The timeout time is configurable between 1 second and 11 minutes, in 1 second increments.
The warning period is configurable between 0 and 59 seconds.
Note that this feature is more closely related to machine and vehicle operation than crane use.
To Next Page
Loading...
Need help?
General
