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NOTE
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.
DC Braking
During DC braking DC voltage is supplied to the
motor, and this will cause the shaft to be brought to
a standstill. In parameter 132 DC brake voltage DC
brake voltage can be preset from 0-100%. Max. DC
brake voltage depends on the motor data selected.
In parameter 126 DC braking time DC braking time
is determined and in parameter 127 DC brake cut-in
frequency the frequency at which DC braking becomes
active is selected. If a digital input is programmed to DC
braking inverse [5] and shifts from logic '1' to logic '0',
DC braking will be activated. When a stop command
becomes active, DC braking is activated when the
output frequency is less than the brake cut-in frequency.
NOTE
DC braking may not be used if the inertia in
the motor shaft is more than 20 times greater
than the motor's internal inertia.
126 DC brake time
(DC BRAKING TIME)
Value:
0 - 60 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.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.90.F2.22 - VLT is a registered Danfoss trademark
Decentral Solutions
127 DC brake cut-in frequency
(DC BRAKE CUT-IN)
Value:
0.0 (OFF) - par. 202
Output frequency high limit, f
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)
Thermistor warning
(THERMISTOR WARN)
Thermistor trip (THERMISTOR TRIP)
ETR warning 1 (ETR WARNING 1)
ETR trip 1 (ETR TRIP 1)
ETR warning 2 (ETR WARNING 2)
ETR trip 2 (ETR TRIP 2)
ETR warning 3 (ETR WARNING 3)
ETR trip 3 (ETR TRIP 3)
ETR warning 4 (ETR WARNING 4)
ETR trip 4 (ETR TRIP 4)
10 sec
Function:
The variable frequency drive 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 31a
/ 31b. Thermistor is to be selected if a possibly
integrated thermistor in the motor is to be able
to stop the variable frequency drive if the motor
overheats. The cut-out value is 3 k .
OFF
MAX
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
113
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