Danfoss VLT 2010 Manual page 22

®
VLT Series 2000
208 Digital Reference 4 (REF. 4 DIG)
Value:
-100.00% - +100.00%
Function:
The digital speed references are generated internally in the
unit and presented as a percentage of the difference
between the f and f selected in parameters 201 and
MAX MIN
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
1 0
0 1
1 1
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.
= ROM default setting. Text in ( ) = display text.
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0 % of f f
MAX - MIN
Set the low frequency (f
occur.
If the output frequency falls below the frequency set (f
the display shows LO FREQ. WARN.
You can also choose to program the signal outputs in
parameters 408 and 409 to give a signal.
Digital reference 1
Set the high frequency (f
Digital reference 2
occur.
Digital reference 3
Digital reference 4
If the output frequency increases above the frequency set
(f
You can also choose to program the signal outputs in
parameters 408 and 409) to give a signal.
Set the current (I
If the motor current rises above the I
display will read HI CURR. WARN.
You can also choose to program the signal outputs in
parameters 408 and 409 to give a signal.
Using this parameter you can record the required
acceleration time from 0.1 Hz to the rated output frequency
(parameter 105).
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.
Figures in [ ] are used when communicating with the bus.
210 Warning: Low Frequency (LO FREQ. W)
Value:
0 to 500 Hz
Function:
) at which the warning is to
LOW
Description:
211 Warning: High Frequency (HI FREQ. W)
Value:
0 to 500 Hz
Function:
) at which the warning is to
HIGH
Description:
), the display will read HI FREQ. WARN.
HIGH
213 Warning: High Current (HI CURR. W)
Value:
0.0 to I
VLT,MAX
Function:
) at which the warning is to occur.
HIGH
Description of choice:
215 Accel (ramp-up) Time (RAMP UP TI)
Value:
0.1 to 800 sec.
Function:
Description:
Programming
120 Hz
),
LOW
120 Hz
I
VLT,MAX
programmed, the
HIGH
5 s
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