VLT
®
2800 Series
Programming
NB!:
If parameter 123 is set too high, and DC
hold has been chosen in parameter 122,
the output frequency will jump to the value
in parameter 123 without ramping up. This may
cause an overcurrent warning / alarm.
126 DC brake time
(DC BRAKING TIME)
Value:
0 - 60 sec.
✭ 10 sec
Function:
In this parameter, the DC brake time is set at which
parameter 132 DC brake voltage is to be active.
Description of choice:
Set the required time.
127 DC brake cut-in frequency
(DC BRAKE CUT-IN)
Value:
0.0 (OFF) - par. 202
Output frequency high limit, f
MAX
✭ OFF
Function:
In this parameter, the DC brake cut-in frequency
is set at which the DC brake is to be activated
in connection with a stop command.
Description of choice:
Set the required frequency.
128 Thermal motor protection
(MOT.THERM PROTEC)
Value:
✭No protection (NO PROTECTION)
[0]
Thermistor warning
(THERMISTOR WARN)
[1]
Thermistor trip (THERMISTOR TRIP)
[2]
ETR warning 1 (ETR WARNING 1)
[3]
ETR trip 1 (ETR TRIP 1)
[4]
ETR warning 2 (ETR WARNING 2)
[5]
ETR trip 2 (ETR TRIP 2)
[6]
ETR warning 3 (ETR WARNING 3)
[7]
ETR trip 3 (ETR TRIP 3)
[8]
ETR warning 4 (ETR WARNING 4)
[9]
ETR trip 4 (ETR TRIP 4)
[10]
Function:
The frequency converter can monitor the motor
temperature in two different ways:
- Via a PTC thermistor that is mounted on the motor.
The thermistor is connected between terminal 50
(+10V) and one of the digital input terminals 18, 19,
27 or 29. See parameter 300 Digital inputs.
- Thermal load calculation (ETR - Electronic
Thermal Relay), based on present load and
time. This is compared with the rated motor
current I
M,N
and rated motor frequency f
M,N
.
The calculations take into account the need for
lower loading at low speeds due to the motor’s
internal ventilation being reduced.
ETR functions 1-4 do not begin to calculate the load
until you switch to the Setup in which they have been
selected. This means that you can use the ETR function
even when changing between two or more motors.
Description of choice:
Select No protection [0] if you do not want a warning
or trip when a motor is overloaded.
Select Thermistor warning [1] if you want a warning
when the connected thermistor becomes too hot.
Select Th ermistor trip [2] if you want a trip when the
connected thermistor becomes too hot.
Select ETR warning 1-4 if you want a warning when
the motor is overloaded according to the calculations.
You can also programme the frequency converter to
give a warning signal via one of the digital outputs.
Select ETR Trip 1-4 if you want a trip when the motor
is overloaded according to the calculations.
NB!:
This function cannot protect the individual
motors in the case of motors linked in parallel.
✭ = factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A9.02 - VLT is a registered Danfoss trademark
23
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