Function:
This parameter is used for setting the DC braking cur-
rent that is activated upon a stop when the DC brake
frequency set in parameter 116,
DC brake cut-in fre-
quency
has been reached, or if DC brake inverse is
active via terminal 27 or via the serial communication
port. The DC braking current will be active for the du-
ration of the DC braking time set in parameter 115
DC
braking time
.
VLT 6152-6602, 380-460 V and VLT 6102-6652,
525-600 V work with a reduced DC current. The level
can, depending on motor selection, be down to 80%.
Description of choice:
To be set as a percentage value of the rated motor
current I
M,N
set in parameter 105 Motor current,
I
VLT,N
. 100% DC braking current corresponds to I
M,N
.
Make sure not to supply too high a braking
current for too long.The motor will be dam-
aged because of mechanical overload or
the heat generated in the motor.
115
DC braking time
(DC BRAKE TIME)
Value:
0.0 - 60.0 sec.
10 sec.
Function:
This parameter is for setting the DC braking time for
which the DC braking current (parameter 113) is to be
active.
Description of choice:
Set the desired time.
116
DC brake cut-in frequency
(DC BRAKE CUT-IN)
Value:
0.0 (OFF) - par. 202
Output frequency high limit, f
MAX
OFF
Function:
This parameter is used for setting the DC brake cut-in
frequency at which DC braking is to be activated in
connection with a stop command.
Description of choice:
Set the desired frequency.
117
Motor thermal protection
(MOT. THERM PROTEC)
Value:
No protection (NO PROTECTION)
[0]
Thermistor warning (THERMISTOR WARN-
ING)
[1]
Thermistor trip (THERMISTOR FAULT)
[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 is able to monitor the motor
temperature in two different ways:
-
Via a thermistor sensor fitted to the motor.
The thermistor is connected to one of the an-
alog input terminals 53 and 54.
-
Calculation of the thermal load (ETR - Elec-
tronic Thermal Relay), based on the current
load and the 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 in the motor
itself.
ETR functions 1-4 do not start calculating the load until
there is a switch-over to the Setup in which they were
selected. This enables the use of the ETR function,
even where two or several motors alternate.
Description of choice:
Select
No protection
[0] if no warning or tripping is re-
quired when the motor is overloaded.
Select
Thermistor warning
[1] if a warning is desired
when the connected thermistor gets too hot.
Select
Thermistor trip
[2] if cutting out (trip) is desired
when the connected thermistor overheats.
Select
ETR Warning 1-4
, if a warning is to come up on
the display when the motor is overloaded according to
the calculations.
The frequency converter can also be programmed to
give off a warning signal via one of the digital outputs.
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark
113
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ogr
a
mmi
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