Lenze MC1000 Series - Manual (Page 61)

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33 SPEED DP (SPEED DECIMAL POINT)
This parameter is used to move the decimal point location in the speed display. This
parameter will not have any effect if UNITS is set to HERTZ or % HZ. The possible
settings are: XXXXX, XXX.X, XX.XX, X.XXX, and .XXXX. Refer to Parameter 32
- HZ MULT above for an example on the use of SPEED DP.
34
LOAD MLT (LOAD MULTIPLIER)
This parameter is used to scale the % LOAD display. If the drive output current rating
is higher than the motor full load current rating, the drive will not display 100% load
when the motor is at full load. Setting this parameter to the ratio (in %) of the drive
output current rating to the motor full load current rating will scale the load display
to show motor load instead of drive load. This will result in a display of 100% when
the motor is at full load.
The motor overload circuitry is also affected by this parameter. When the display
reads 150% load, the drive will trip on OVERLOAD in one minute, regardless of the
actual motor current. If this parameter is used to scale the display to show actual
motor load, then Parameter 17 - MOTOR OL should be left at 100%. Likewise, if
MOTOR OL has been set according to the motor full load rating, this parameter
should be left at 100%. Changing both parameters will result in an OVERLOAD
fault sooner than expected.
The output signal at TB-10B is also affected by this parameter. When set to the
ratio of current ratings as explained above, the output signal will be proportional to
motor load instead of drive load.
35
CONTRAST (LCD DISPLAY CONTRAST)
This parameter is used to adjust the contrast of the drive display and can be set
to LOW, MED, or HIGH in order to obtain the most visible display. If the drive is
mounted lower than eye level, a HIGH setting may make the display more visible.
Likewise, if the drive is mounted higher than eye level, a LOW setting may make
the display more visible.
36
SLEEP TH (SLEEP THRESHOLD)
The MC1000 Series drive has a Sleep Mode function that allows the drive to cease
operation when system demand falls below a preset level. This is to prevent the
motor from operating at low speeds for long periods of time. It is commonly used
along with the PID Set point Control feature, but can also be used in standard speed
control mode.
When the commanded speed falls below the SLEEP THRESHOLD setting for the
defined SLEEP DELAY time (see Parameter 37 below), the drive will "go to sleep" and
the motor will go to zero speed. The drive will remain "sleeping" until it is commanded
to operate at a speed that is 2 Hz above the SLEEP THRESHOLD, at which point
it will "wake up" and ramp the motor up to the commanded speed.
NOTE 1: While the drive is in Sleep Mode, the Status portion of the display will
read SLEEP.
NOTE 2: If the drive's commanded speed goes below the SLEEP THRESHOLD,
the SLEEP DELAY timer will start to count down. If the commanded speed equals
or exceeds the SLEEP THRESHOLD before the SLEEP DELAY times out, the
SLEEP DELAY timer will be reset.
NOTE 3: If the drive is in a Stop state, and the commanded speed is below the
SLEEP THRESHOLD, the drive will immediately go to sleep upon a Start command,
bypassing the SLEEP DELAY.