VLT
®
5000 FLUX
127 DC brake cut-in speed
(DC BRAKE CUT-IN)
Value:
0.0 - parameter 202
✭
0.0 rpm (OFF)
Function:
Setting the DC brake cut-in speed at which the
DC braking current (parameter 125) is active, in
connection with a stop command.
Description of choice:
Set the cut-in speed.
128 Motor thermal protection
(MOT.THERM PROTEC)
Value:
✭
No protection (NO PROTECTION)
[0]
Thermistor warning (THERMISTOR WARN)
[1]
Thermistor trip (THERMISTOR TRIP)
[2]
ETR Warning 1 (ETR WARNING1)
[3]
ETR Trip 1 (ETR TRIP1)
[4]
ETR Warning 2 (ETR WARNING2)
[5]
ETR Trip 2 (ETR TRIP2)
[6]
ETR Warning 3 (ETR WARNING3)
[7]
ETR Trip 3 (ETR TRIP3)
[8]
ETR Warning 4 (ETR WARNING 4)
[9]
ETR Trip 4 (ETR TRIP4)
[10]
Function:
The frequency converter can detect the motor
temperature for motor protection in two different ways:
-
Via a thermistor sensor connected to one
of the analog inputs, terminals 53 and 54
(parameter 308 and 311).
-
Calculation of the thermal load, based on the
actual load and time. This is compared with the
rated motor current I
M,N
and the rated motor
frequency f
M,N
. The calculations made take into
account the need for a lower load at lower speeds
because of less cooling from the fan.
ETR (Electronic Terminal Relay) functions 1-4 do not
start calculating the load until there is a switch-over to
the Setup in which they were selected. For the North
American market: The ETR functions provide class 20
motor overload protection in accordance with NEC.
Description of choice:
Select
No protection
if no warning or tripping is
required if the motor is overloaded.
Select
Thermistor warning
if a warning is desired when
the connected thermistor in the motor gets too hot.
Select
Thermistor trip
if cutting out (trip) is desired when
the connected thermistor in the motor gets too hot.
Select
ETR Warning 1-4
, if a warning is to come
up on the display when the motor is overloaded
according to the calculations.
Select
ETR Trip 1-4
if tripping is desired when the
motor is overloaded according to the calculations.
A warning signal can be programmed via one of the
digital outputs, in which case the signal is given both
for warning and for trip (thermal warning).
129 External motor fan
(MOTOR EXTERN FAN)
Value:
✭
No (NO)
[0]
Yes (YES)
[1]
Function:
This parameter informs the frequency converter
whether the motor has an external separately
supplied fan (external ventilation), indicating that
derating at low speed is unnecessary.
Description of choice:
If
Yes
[1] is selected, the graph below is followed
if the motor frequency is lower. If the motor
frequency is higher, the time will still derate as
if no fan had been installed.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.55.A6.02 - VLT is a registered Danfoss trademark
74