Lenze MC1000 Series User Manual

Page 61

13435742_EDBM101_v24

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.