Dc Brake Time; Etr - Electronic Thermalrelay - Danfoss VLT 2800 Series Operating Instructions Manual

away using parameter 130 Start frequency and pa-
rameter 131 Voltage at start.
122 Function at stop
122
(FUNCTION AT STOP)
Value:
Coasting (COAST)
DC hold (DC HOLD)
Function:
This is where to choose the function of the fre-
quency converter after the output frequency has
become lower than the value in parameter 123 The
min. frequency for activation of function at stop or
after a stop command and when the output fre-
quency has been ramped down to 0 Hz.
Description of choice:
Select Coasting [0] if the frequency converter is to
'let go' of the motor (inverter turned off).
Select DC hold [1] if parameter 137 DC hold voltage
is to be activated.
123 Min. frequency for activation of function at
123
stop
(MIN.F.FUNC.STOP)
Value:
0,1 - 10 Hz
Function:
In this parameter, the output frequency is set at
which the function selected in parameter 122 Func-
tion at stop is to be activated.
Description of choice:
Set the required output frequency.

126 DC brake time

126
(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.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A5.02 - VLT is a registered Danfoss trade mark
®
VLT 2800 Series
Description of choice:
Set the required time.
127 DC brake cut-in frequency
127
(DC BRAKE CUT-IN)
Value:
[0]
0.0 (OFF) - par. 202 Output frequency high limit,
[1]
f
MAX
Function:
In this parameter, the DC brake cut-in frequency is
set at which the DC brake is to be activated in con-
nection with a stop command.
Description of choice:
Set the required frequency.
128 Thermal motor protection
128
(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)
0,1 Hz
ETR trip 3 (ETR TRIP 3)
ETR warning 4 (ETR WARNING 4)
ETR trip 4 (ETR TRIP 4)
Function:
The frequency converter can monitor the motor tem-
perature in two different ways:
- Via a PTC thermistor that is mounted on the
motor. The thermistor is connected between ter-
minal 50 (+10V) and one of the digital input
terminals 18, 19, 27 or 29. See parameter 300
Digital inputs.
- Thermal load calculation (ETR - Electronic Ther-
10 sec mal Relay), based on present load and time. This
is compared with the rated motor current I
rated motor frequency f
into account the need for lower loading at low
speeds due to the motor's internal ventilation be-
ing reduced.
OFF
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
and
M,N
. The calculations take
M,N
19