2-164 Sleep Mode
Timers
Timers will determine the length of time required for Sleep/Wake levels to
produce true functions. These timers will start counting when the Sleep/
Wake levels are satisfied and will count in the opposite direction whenever
the respective level is dissatisfied. If the timer counts all the way to the user
specified time, it creates an edge to toggle the Sleep/Wake function to the
respective condition (sleep or wake). On power up, timers are initialized to
the state that does not permit a start condition. When the analog signal
satisfies the level requirement, the timers start counting.
Interactive functions
Separate start commands are also honored (including a digital input “start”),
but only when the sleep timer is not satisfied. Once the sleep timer times
out, the sleep function acts as a continuous stop. There are two exceptions to
this, which will ignore the Sleep/Wake function:
1. When a device is commanding “local” control
2. When a jog command is being issued.
When a device is commanding “local” control, the port that is commanding
it has exclusive start control (in addition to ref select), essentially overriding
the Sleep/Wake function, and allowing the drive to run in the presence of a
sleep situation. This holds true even for the case of Port 0, where a digital
input start or run will be able to override a sleep situation.
Sleep/Wake Levels
Normal operation will require that [Wake Level] be set greater than or equal
to [Sleep Level]. However, there are no limits that prevent the parameter
settings from crossing, but the drive will not start until such settings are
corrected. These levels are programmable while the drive is running. If
[Sleep Level] is made greater than [Wake Level] while the drive is running,
the drive will continue to run as long as the analog input remains at a level
that doesn’t trigger the sleep condition. Once the drive goes to sleep in this
situation, it will not be allowed to restart until the level settings are
corrected (increase wake, or decrease sleep). If however, the levels are
corrected prior to the drive going to sleep, normal Sleep/Wake operation
will continue.
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