89
MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
Parameter description
1.. Load and motor
✮
= Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
101
Speed control
(Speed control)
Value:
Open loop (open loop)
[0]
✭
Slip compensated (slip comp)
[1]
Closed loop (closed loop)
[2]
Function:
It is possible to select three different types of
speed control: open loop, slip compensation
and closed loop.
Description of choices:
Open loop is selected when parallel-coup-
led motors or synchronous type motors are
used, or if slip compensation is not required
for another reason.
Slip compensation is selected on normal
operation where constant motor speed is
required, with varying load.
Closed loop is selected if operation with
process feedback is required. This selection
also requires selection of feedback type in
parameter 114 (current, voltage or pulsa-
tions) and setting of PID regulator para-
meters (119-125).
102
Current limit control
(Set cur.limit)
Value:
✭
Preprogrammed value
(Program.value)
[0]
Voltage signal (10 VDC signal)
[1]
Current signal (20 mA signal)
[2]
Function:
The current limit can be set in parameter
209 and in parameter 412 or 413 with the
help of a current or voltage signal.
Description of choices:
Preprogrammed value is selected when a
fixed set limit for current is required. This
current limit is set in parameter 209.
Voltage signal is selected if the current limit
is to be changed during operation with the
help of a control signal of e.g. 0-10 V on
analogue input 53 (parameter 412) where
0 V will correspond to 0% current and 10 V
to the value in parameter 209.
Current signal is selected on e.g. 0-20 mA
on analogue input 60 (parameter 413).
Here 0 mA will correspond to 0% current
limit and 20 mA will correspond to the value
in parameter 209.
Note:
The start conditions (terminals 18 and
27) must be present together with a
speed reference (possibly digital ref.
parameter 205-208) so that current limit
control can be used.
Warning:
If the aforementioned conditions exist
when the unit is switched on, the motor
can rotate for up to 5 sec. even though
the current limit setting is 0.
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