23
★
= ROM default setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
VLT
®
Series 2000
Programming
208 Digital Reference 4 (REF. 4 DIG)
Value:
-100.00% - +100.00%
★
0 % of f
MAX -
f
MIN
Function:
The digital speed references are generated internally in the
unit and presented as a percentage of the difference
between the f
MAX
and f
MIN
selected in parameters 201 and
202, added to f
MIN
.
Description:
By means of terminal 29 you can switch between the other
references (terminal 29 = 0 V) and the sum of the other/
digital references (terminal 29 = 24 V).
You must select Digital reference in parameter 402 and 403
to file one of the digital references:
Terminal 18/27
Terminal 19
0
0
Digital reference 1
1
0
Digital reference 2
0
1
Digital reference 3
1
1
Digital reference 4
209 Current Limit (CURRENT LI)
Value:
0.3 to I
VLT,MAX
Function:
Use this parameter to set the maximum intermittent output
current. If the current limit is exceeded, the output
frequency is reduced until the current falls to below the
current limit. The output frequency will not increase to the
reference level until the current has fallen below the current
limit.
Description of choice:
The value set at the factory corresponds to a load which is
160% (VLT 2030, 3Ø 208-240 V: 140%) of the rated output
current. If the current limit is to be used as motor protection,
the rated motor current must be programmed. Parameter
310 determines the length of time that the drive will run in
current limit before an overcurrent fault. The load range
between 100 and 160% can be programmed, but it is only
intended for intermittent operation therefore the unit can
only give an output of 160% (VLT 2030, 3Ø 208-240 V:
140%) for 60 seconds. The intermittent operating time will
be extended as the load drops below 110%, and becomes
unlimited at 100%.
If the switching frequency is higher than 4.5 kHz
this period will be shorter.
210 Warning: Low Frequency (LO FREQ. W)
Value:
0 to 500 Hz
★
120 Hz
Function:
Set the low frequency (f
LOW
) at which the warning is to
occur.
Description:
If the output frequency falls below the frequency set (f
LOW
),
the display shows LO FREQ. WARN.
You can also choose to program the signal outputs in
parameters 408 and 409 to give a signal.
211 Warning: High Frequency (HI FREQ. W)
Value:
0 to 500 Hz
★
120 Hz
Function:
Set the high frequency (f
HIGH
) at which the warning is to
occur.
Description:
If the output frequency increases above the frequency set
(f
HIGH
), the display will read HI FREQ. WARN.
You can also choose to program the signal outputs in
parameters 408 and 409) to give a signal.
213 Warning: High Current (HI CURR. W)
Value:
0.0 to I
VLT,MAX
★
I
VLT,MAX
Function:
Set the current (I
HIGH
) at which the warning is to occur.
Description of choice:
If the motor current rises above the I
HIGH
programmed, the
display will read HI CURR. WARN.
You can also choose to program the signal outputs in
parameters 408 and 409 to give a signal.
215 Accel (ramp-up) Time (RAMP UP TI)
Value:
0.1 to 800 sec.
★
5 s
Function:
Using this parameter you can record the required
acceleration time from 0.1 Hz to the rated output frequency
(parameter 105).
Description:
To ensure the fastest possible start, choose a value for the
ramp-up time so that the current limit is not activated. The
ramp-up time is always defined as the acceleration time
from 0 Hz to the rated motor frequency.
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