Danfoss AKD 5001 Manual page 72

Description of choice:
Set the desired frequency.
128 Motor thermal protection
(MOT.THERM PROTEC)
Value:
No protection (NO PROTECTION)
Thermistor warning (THERMISTOR WARN)
Thermistor trip (THERMISTOR TRIP)
ETR Warning 1 (ETR WARNING1)
ETR Trip 1 (ETR TRIP1)
ETR Warning 2 (ETR WARNING2)
ETR Trip 2 (ETR TRIP2)
ETR Warning 3 (ETR WARNING3)
ETR Trip 3 (ETR TRIP3)
ETR Warning 4 (ETR WARNING 4)
ETR Trip 4 (ETR TRIP4)
Function:
The frequency converter is able to monitor the motor
temperature in two different ways:
- Via a thermistor sensor connected to one
of the analogue inputs, terminals 53 and 54
(parameters 308 and 311).
- Calculation of the thermal load, based on the
current load and the time. This is compared with
the rated motor current I
frequency f . The calculations made take into
M,N
account the need for a lower load at lower speeds
because of less cooling from the fan.
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. For the North American market: The ETR
functions provide class 10 or 20 motor overload
protection in accordance with NEC.
Description of choice:
Select No protection if no warning or tripping is
required when the motor is overloaded.
Select Thermistor warning if a warning is desired when
the connected thermistor - and thus the motor
- gets too hot.
Select Thermistor trip if cutting out (trip) is desired when
the connected thermistor - and thus the motor
- 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.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.50.R3.02 -
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
and the rated motor
M,N
AKD 5000
Select ETR Trip 1-4 if tripping is desired 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, in which case the signal is given both for
warning and for trip (thermal warning).
71