References & Limits; Handling Of References - Danfoss VLT 2800 Manual

References & Limits
200 Output frequency range
(OUT FREQ. RNG/ROT)
Value:
Only clockwise, 0 - 132 Hz
(132 Hz CLOCKWISE)
Both directions, 0 - 132 Hz
(132 Hz BOTH DIRECT)
Anti-clockwise only, 0 - 132 Hz
(132 Hz COUNTER CLOCK)
Clockwise only, 0 - 1000 Hz
(1000 Hz CLOCK WISE)
Both directions, 0 - 1000 Hz
(1000 Hz BOTH DIRECT)
Anti-clockwise only, 0 - 1000 Hz
(1000 Hz COUNTER CLOCK)
Function:
This parameter guarantees protection against unwan-
ted reversing. Furthermore, the maximum output fre-
quency can be selected that is to apply regardless of
the settings of other parameters. This parameter has
no function if Process regulation, closed loop has been
selected in parameter 100 Configuration.
Description of choice:
Select the required direction of rotation as well as the
maximum output frequency. Please note that if Clock-
wise only [0]/[3] or Anti-clockwise only [2]/[5] is selec-
ted, the output frequency will be limited to the range
f -f . If Both directions [1]/[4] is selected, the out-
MIN MAX
put frequency will be limited to the range ± f
minimum frequency is of no significance).
201 Output frequency low limit, f
(MIN OUTPUT FREQ)
Value:
0.0 - f
MAX
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.E2.02 - VLT is a registered Danfoss trademark
Function:
In this parameter, a minimum motor frequency limit
can be selected that corresponds to the minimum
speed at which the motor is allowed to run. If Both di-
rections has been selected in parameter 200 Output
frequency range, the minimum frequency is of no sig-
nificance.
[0]
Description of choice:
[1]
The value chosen can range from 0.0 Hz to the fre-
quency set in parameter 202 Output frequency high
[2]
limit, f .
MAX
[3]
202
[4]
Value:
[5]
f - 132/1000 Hz (par. 200 Output fre-
MIN
quency range)
Function:
In this parameter, a maximum output frequency limit
can be selected that corresponds to the highest speed
at which the motor is allowed to run.
Description of choice:
A value can be selected from f
in parameter 200 Output frequency range.
(the
MAX

Handling of references

Handling of references is described in the block dia-
gram below. The block diagram shows how a change
in one parameter can affect the resulting reference.
Parameters 203 to 205 Reference and parameter
214 Reference function define how the handling of ref-
erences can be performed. The parameters men-
tioned can be active in both closed and open loop.
MIN
0.0 Hz
Output frequency high limit, f
(max. output freq)
NB!
The output frequency of the frequency
converter can never assume a value high-
er than 1/10 of the switching frequency
(parameter 411 Switching frequency).
to the value chosen
MIN
MAX
132 Hz
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