Sleep Mode 2-137
Sleep Mode The basic operation of this function is to start (wake) the drive when an
analog signal is greater than or equal to the user specified [Wake Level], and
stop the drive when an analog signal is less than or equal to the user
specified [Sleep Level].
Enabling the sleep wake function is accomplished by setting the
[Sleep-Wake Mode] parameter to “Direct”.
All previously defined permissives (stop, enable, faults, type 2 alarms, etc.)
are honored. In addition to the sleep function, at least one of the following
assignments must be made to a digital input, and the input must be closed:
(Enable, Stop-CF, Run, Run Fwd, Run Rev).
Restarting following a fault condition will be possible by either a rising
edge of the timed wake signal or a separate start signal. A wake signal
condition will not interfere with the resetting of a fault or restarting of the
drive with another signal.
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). Upon power up, timers should be
initialized to the state that does not permit a start condition, and then start
counting if the analog signal satisfies the level requirement.
Separate start commands are also honored (including a digital input “start”),
but only when the sleep timer is not satisfied, essentially acting 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, and
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.
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. All defined analog inputs for a product shall be considered as
valid Sleep/Wake sources. The Sleep/Wake function is completely
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