Danfoss VLT 3006 Product Manual page 90

Parameter description
101
Speed control
(Speed control)
102
Current limit control
(Set cur.limit)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Value:
Open loop (open loop)
Slip compensated (slip comp)
Closed loop (closed loop)
Value:
Preprogrammed value
(Program.value)
Voltage signal (10 VDC signal)
Current signal (20 mA signal)
= Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication.
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
Function:
[0]
It is possible to select three different types of
[1]
speed control: open loop, slip compensation
[2]
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).
Function:
The current limit can be set in parameter
[0]
209 and in parameter 412 or 413 with the
[1]
help of a current or voltage signal.
[2]
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.
1.. Load and motor
89