45
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
Section 1Section 1Section 1Section 1Section 1
Section 2Section 2Section 2Section 2Section 2
Section 3Section 3Section 3Section 3Section 3
Section 4Section 4Section 4Section 4Section 4
★
= factory setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
101 Speed Control (SPEED CONTROL)
Value:
★
Open loop (OPEN LOOP)
[0]
Closed loop (CLOSED LOOP)
[2]
Function:
It is possible to choose two different kinds of speed
control:
Open loop
and
closed loop
.
Description of choice:
Open loop
[0] is chosen if an external control without
process feedback is desired.
Closed loop
[2] is
chosen to use the integrated PID controller of the VLT
3500 HVAC. A detailed description is shown on page
47.
103 Motor power (MOTOR POWER)
Value:
Depends on unit
Under size 2
[0]
Under size 1
[1]
★
Rated size
[2]
Function:
This parameter allows a choice of the kW value that
best matches the rated motor power.
At the factory, a rated kW value has been chosen. kW
values depend on the type of unit.
Description of choice:
Check the rated motor power in kW on the motor
nameplate and select the setting that best matches
the motor size. If this value deviates substantially from
the setting options, choose the nearest lower or
higher value.
104 Motor voltage (U
M,N
)(MOTOR VOLTAGE)
Value:
Only 200-230 V units
★
200 V
[0]
220 V
[1]
230 V
[2]
Only 380-415 V units
★
380 V
[3]
400 V
[4]
415 V
[5]
Only 440-500 V units
440 V
[6]
★
460 V
[7]
500 V
[8]
Function:
The rated voltage that matches the motor (nameplate)
can be selected.
Description of choice:
Parameters 107 and 109 are changed automatically.
All values can be addressed via the bus.
It is possible to choose 440 V motor voltage on a 400
V unit. This facility can be used to obtain a better
optimized motor voltage, e.g. by using a 440 V motor
on 415 V mains supply. If VLT 3575-3800 has been
set at the factory to 500 V, this means that the lowest
motor voltage that can be selected is 440 V. In para-
meter 650 the same VLT type can be chosen, but for
400 V mains supply.
3.5 Parameter gr
oup 1
102 Setting of current limit (SET CUR. LIMIT)
Value:
★
Pre-programmed value
(PROGRAM.VALUE)
[0]
Voltage signal (10 V DC SIGNAL)
[1]
Current signal (20 mA SIGNAL)
[2]
Function:
Speed can be controlled by means of the current li-
mit, which allows indirect control of the torque.
The current limit can be set in parameter 209, or by
means of a current or voltage signal in parameter 412
or parameter 413.
Description of choice:
Pre-programmed value
[0] is chosen if a fixed, set limit
for the current is desired. This current limit is selected
in parameter 209.
Voltage signal
[1] is selected if the current limit is to be
adjustable during operation by means of a control sig-
nal of e.g. 0-10 V on analogue input 53 (parameter
412). In this context, 0 V corresponds to 0% current
and 10 V corresponds to the value in parameter 209.
Current signal
[2] is chosen e.g. to be 0-20 mA on
analogue input 60 (parameter 413). Here, 0 mA corre-
sponds to 0% current limit, and 20 mA corresponds
to the value of parameter 209.
NB!:
NB!:
NB!:
NB!:
NB!:
The starting conditions (terminals 18 and 27)
must be present together with a speed refe-
rence (possibly digital ref. parameters 205-208)
for current limit control to be applicable.
If the above-mentioned conditions are fulfil-
led when the unit is turned on, the motor
may rotate for up to 5 seconds, even if the current
limit setting is 0.
