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 adjustable 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 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 func-
tion 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
Thermistor 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 program the adjustable frequency drive 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.
NOTE
This function cannot protect the individual
motors in the case of motors linked in par-
allel.
130
Start frequency
(Start frequency)
Value:
0.0 - 10.0 Hz
0.0 Hz
Function:
The start frequency is active for the time set in param-
eter 120
Start delay
, after a start command. The output
frequency will 'jump' to the next preset frequency. Cer-
tain motors, such as conical anchor motors, need an
extra voltage/start frequency (boost) at start to disen-
gage the mechanical brake. To achieve this parame-
ters 130
Start frequency
and 131
Initial voltage
are
used.
Description of choice:
Set the required start frequency. It is a precondition
that parameter 121
Start function
, is set to
Start fre-
quency/voltage clockwise
[3] or
Start frequency voltage
in reference direction
[4] and that in parameter 120
Start
delay
a time is set and a reference signal is present.
NOTE
If parameter 123 is set higher than param-
eter 130, the start delay function (param-
eter 120 and 121) will be skipped.
131
Initial voltage
(INITIAL VOLTAGE)
Value:
0.0 - 200.0 V
0.0 V
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark
47
Prog
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