46
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
107 Motor current (|
M,N
)(MOTOR CURRENT)
Value:
I
Φ
- I
VLT,MAX
Function:
The rated current of the motor forms part of VLT 3500
HVAC's calculation of torque and thermal motor
protection.
Description of choice:
The rated motor current, in ampere, which can be
seen from the motor nameplate, must be keyed in.
I
Φ
is the magnetising current of the motor and
depends on the motor size.
109 Start voltage (START VOLTAGE)
Value:
0.0 - (U
M,N
+ 10%)
Function:
When
Constant torque start
(CT) has been chosen in
parameter 100, the start voltage can be adjusted. By
increasing the start voltage, a high start torque can be
obtained. Small motors (<1.0 kW) normally require a
high start voltage. By connecting the motors in paral-
lel, the start voltage can be used to increase the start
torque. The programmed value is not changed in the
case of varying load.
105 Motor frequency (f
N
)(MOTOR FREQ)
Value:
50 Hz (50 Hz)
[0]
60 Hz (60 Hz)
[1]
87 Hz (87 Hz)
[2]
100 Hz (100 Hz)
[3]
★
Depends on unit
Function:
The frequency that corresponds to the rated motor
frequency (nameplate) is chosen.
Description of choice:
If a motor for 220/230 V is connected to a 380/415 V
frequency converter, the standard value (50 Hz) must
be changed to 87 Hz to obtain 220/230 V at 50 Hz.
Parameters 107 and 109 are changed automatically.
Description of choice:
This value is selected taking into consideration that
the motor must be able to start with the desired
torque:
1. Select a value that enables starting with the given
load.
2. Reduce this value, until starting up with the given
load is just possible.
U
M,N
= rated motor voltage.
If the use of start voltage is exaggerated,
this can lead to over-magnetisation and
overheating of the motor; the frequency converter
may cut out. So be careful when using the start volt-
age.
3.5 Parameter gr
oup 1
