24
★
= ROM default setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
Programming
VLT
®
Series 2000
216 Decel (ramp-down) Time (RAMP DOWN)
Value:
0.1 to 800 sec.
★
5 s
Function:
Using this parameter you can record the required
deceleration time from rated output frequency to 0 Hz.
Description:
The ramp-down time can be selected in the range 0.1-800
seconds. If the ramp-down time is too short the VLT's
voltage limit becomes active, which will extend the ramp-
down time. Short ramp-down times will require a VLT unit
with a brake function and installation of a brake resistor.
The ramp-down time is always defined as the deceleration
time from the rated motor frequency to 0 Hz.
218 Quick Stop Ramp (QUICK STOP RAMP)
Value:
0.1 - 800 sec.
★
1 s
Function:
Using this parameter you can choose an alternative
deleceration ramp - a programmable quick stop ramp.
Description of choice:
The ramp-down time can be selected in the range 0.1 - 800
seconds, calculated from the rated frequency to 0 Hz. If the
ramp-down time is too short the VLT's voltage limit
becomes active, which will extend the ramp-down time.
Short ramp-down times will require a VLT unit with a brake
function and installation of a brake resistor.
224 Carrier Frequency (CARRIER FR)
Value:
2.0 to 14.0 kHz
★
4.5 kHz
Function:
The set value determines the carrier frequency of the
inverter. Changing the carrier frequency may minimize
acoustic noise from the motor.
Description:
It is possible to change the carrier frequency between 2
and 14 kHz. The disadvantages of operating at a high
carrier frequency are:
-
reduced continuous output current
-
reduced efficiency
-
higher capacitive leakage current
-
increased RFI radiation from the VLT
230 Digital Speed Up/Down (DIG. SPEED UP/DOWN)
Value:
★
Disable (DISABLE)
[0]
Enable (ENABLE)
[1]
Enable and Save (ENABLE and SAVE)
[2]
Function:
Using this parameter you can make the VLT adjustable
frequency drive lock the output frequency to the latest
indicated speed reference.
Description:
You can choose to have either digital speed up/down
(terminal 18/27 and 19) or other speed references. When
you have chosen
Enable you must choose Speed Up
(terminal 18) and
Speed Down (terminal 19) in parameters
402/404 and 403.
When Enable and Save is selected a speed will be saved
automatically after new start-up.
The other references will not be active so that the digital
references cannot be combined with other references.
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