Lenze MC3000 Series - Manual (Page 59)

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32 HZ MULT (HERTZ MULTIPLIER)
The HZ MULTIPLIER is used to scale the output speed indication on the display . This
parameter is only active when UNITS is set for sp RPM, sp /SEC, sp /MIN, or sp /HR .
Multiplying the output frequency by the HZ MULTIPLIER will yield the desired speed
value on the display .
Example:
The desired speed units is RPM with a standard 60 Hz, 1800 RPM motor .
Set UNITS to sp RPM and set HZ MULT to 30 .00 . This will result in a display
of 1110 RPM for an output frequency of 37 Hz (37 Hz X 30 = 1110 RPM) .
Also, if there is a 100:1 gear reducer in the system, Parameter 33 - UNITS
DP below could be set to XX .XX to represent the output of the gear reducer
(11 .10 RPM in the example) .
33 UNITS DP (SPEED UNITS DECIMAL POINT)
In “non-PID” mode, UNITS DP selects the decimal point location of the speed display .
UNITS DP has no effect if UNITS is set to sp HERTZ or sp % HZ .
In PID mode, UNITS DP selects the decimal point location for the PID SETPOINT and
FEEDBACk displays, and FB @ MIN and FB @ MAX .
The possible settings are: XXXXX, XXX .X, XX .XX, X .XXX, and .XXXX . Refer to the above
example in Parameter 32 - HZ MULT .
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 MC3000 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 Setpoint Control feature, but can also be used in standard speed control mode .