LEESON SM-Plus Series Sub-Micro Inverters User Manual
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P76
SLEEP DELAY
This sets the amount of time the drive must operate below the SLEEP THRESHOLD (see P75 on the
previous page) before the drive “goes to sleep” and brings the motor to zero speed.
Example: SLEEP THRESHOLD is set to 15 Hz and SLEEP DELAY is set to 60 seconds. If the drive
operates below 15 Hz for 60 seconds, the drive will go to sleep and the motor will stop. The drive will
display “SLP”, and the drive will remain sleeping until the drive is commanded to a speed equal to or
greater than 17 Hz. At this point, the drive will wake up and ramp the motor up to the commanded
speed. This example assumes that SLEEP BANDWIDTH (P77) is set to 0.
P77
SLEEP BANDWIDTH
This allows the PI feedback signal to determine when the drive should “wake up” when operating in Sleep
Mode. In process systems that utilize Integral Gain (see P65), the drive may cycle in and out of Sleep
Mode more often than desired, due to the Integral function of the PI algorithm.
When SLEEP BANDWIDTH is used, the feedback signal must change by the programmed amount
before the drive will wake up.
Example: In a normal-acting system, the PI setpoint is 50 PSI, SLEEP THRESHOLD is set to 20 Hz,
and SLEEP BANDWIDTH is set to 5 PSI. The drive will enter Sleep Mode when the commanded speed
drops below 20 Hz for the time defined in SLEEP DELAY. The drive will wake up when the feedback
signal drops below 45 PSI (50 PSI setpoint minus 5 PSI bandwidth = 45 PSI), even if the commanded
speed is still below 20 Hz.
B.6
DESCRIPTION OF OTHER PARAMETERS
In addition to the PI feature, two parameters have been added, and additional options have been added
to the open-collector status outputs:
P06/P13 TB-14/TB-15 OUTPUT
Six more options have been added to the open-collector outputs:
11
MIN ALARM: Opens when the feedback signal falls below the MIN ALARM setting.
12
MAX ALARM: Opens when the feedback signal exceeds the MAX ALARM setting.
13
MIN/MAX ALARM: Opens when the feedback signal falls below the MIN ALARM setting or
exceeds the MAX ALARM setting.
14
INV MIN ALARM: Opens when the feedback signal exceeds the MIN ALARM setting.
15
INV MAX ALARM: Opens when the feedback signal falls below the MAX ALARM setting.
16
INV MIN/MAX ALARM: Opens when the feedback signal is within the range defined by the
MIN ALARM and MAX ALARM.
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