TOSHIBA
9 - 8
9.5
DISPLAY GROUP PARAMETERS
UNIVERSAL UNIT MULTIPLICATION FACTOR (ITEM 1) - The LED display can be
changed to display values other than Hz. Revolution and linear speed such as RPM can
be displayed. Use this function as a multiplication or division (fractional multiplication)
scaler to convert to other units.
LOW SPEED DETECTION (ITEM 2) - Use this function to set up a low speed signal
output. This function allows the drive to signal when the output frequency is greater than
or equal to the selected "low speed frequency". The LOW(LL) terminal (see control
board terminal block details on page 5-3) is normally the high impedance state of an
open collector transistor. This terminal will go low (ground) when the low speed detection
frequency is reached.
SPEED REACH SELECTION (ITEM 3) - Selects the option to output a signal when an
acc/dec is complete or when the output frequency is within a selected range. The
RCH(UL) terminal (see control board terminal block details on page 5-3) is normally the
high impedance state of an open collector transistor. This terminal will go low (ground)
when the speed reach detection frequency is reached.
If a frequency range is selected
then "Speed Reach Detection Range" and "Speed Reach Reference" functions
should also be set.
SPEED REACH DETECTION RANGE (ITEM 4) - Use this function to specify a range of
frequencies, above and below the speed reach reference frequency. When the output
frequency is within this range terminal RCH(UL) will be "on". See functions "Speed
Reach Selection" and "Speed Reach Reference".
SPEED REACH REFERENCE (ITEM 5) - Use this function to set the speed reach
detection frequency in the center of the speed reach detection range. See functions
"Speed Reach Selection" and "Speed Reach Detection Range".
DC INJECTION VOLTAGE START FREQUENCY (ITEM 6) - Use this function to set
the frequency at which DC injection voltage will begin to be applied to a motor during a
decelerating stop. This function is used for precise positioning (inching) of the motor
driven equipment. Use this function in conjunction with functions "DC Injection Voltage"
and "DC Injection Time".
DC INJECTION VOLTAGE (ITEM 7) - Use this function to specify the percentage of total
DC injection to apply during the injection time. Use this function in conjunction with
functions "DC Injection Voltage Start Frequency" and "DC Injection Time".
DC INJECTION TIME (ITEM 8) - Use this function to specify the length of time that the
DC injection voltage is to be applied. Use this function in conjunction with functions "DC
Injection Voltage" and "DC Injection Voltage Start Frequency".
OUTPUT VOLTAGE REGULATION (ITEM 9) - This function allows the V/f
characteristics to be set for a motor with a lower rated voltage by setting the V/f
characteristics for 100% output voltage and then proportionally reducing the output
voltage to the required level. An output voltage greater than the input voltage is not
possible but the output voltage can be reduced proportionally to the input voltage.
OVERVOLTAGE STALL PROTECTION SELECT (ITEM 10) - Use this function to select
an automatic lengthening of the deceleration time.
Large inertia loads and/or rapid
deceleration can create motor regeneration overvoltage on the DC bus. This
condition can cause a trip and use of this function should be considered.
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