Danfoss VLT Programming Guide

1-87 Trip Speed Low [Hz]
Range: Function:
0.0 Hz* [Application dependant] If the Trip Speed is set to 0, the function is not active.
If the speed at any time after the start (or during a stop) falls below the value in the parameter,
the drive will trip with an alarm [A49] Speed Limit. Function at stop.
NB!
This parameter is only available if par. 0-02
Motor Speed Unit is set to [Hz].
3.3.9 1-9* Motor Temperature
Parameters for setting the temperature protection features for the motor.
1-90 Motor Thermal Protection
Option: Function:
The frequency converter determines the motor temperature for motor protection in two different
ways:
• Via a thermistor sensor connected to one of the analog or digital inputs (par. 1-93
Ther-
mistor Source
).
• Via calculation (ETR = Electronic Thermal Relay) of the thermal load, based on the actual
load and time. The calculated thermal load is compared with the rated motor current
I
M,N
and the rated motor frequency f
M,N
. The calculations estimate the need for a lower
load at lower speed due to less cooling from the fan incorporated in the motor.
[0] * No protection If the motor is continuously overloaded and no warning or trip of frequency converter is wanted.
[1] Thermistor warning Activates a warning when the connected thermistor in the motor reacts in the event of motor over-
temperature.
[2] Thermistor trip Stops (trips) the frequency converter when the connected thermistor in the motor reacts in the
event of motor over-temperature.
[3] ETR warning 1
[4] * ETR trip 1
[5] ETR warning 2
[6] ETR trip 2
[7] ETR warning 3
[8] ETR trip 3
[9] ETR warning 4
[10] ETR trip 4
ETR (Electronic Thermal Relay) functions 1-4 will calculate the load when set-up where they were selected is active. For example ETR-3 starts calculating
when set-up 3 is selected. For the North American market: The ETR functions provide class 20 motor overload protection in accordance with NEC.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark 57
3

Danfoss VLT Specifications

General

Frequency	50/60 Hz
Enclosure	IP20, IP21, IP55, IP66
Series	VLT
Control Technique	Flux Vector Control
Output Voltage	0-Vinput
Control Method	Fieldbus
Communication Interface	PROFIBUS, CANopen
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Cooling Method	Liquid Cooled
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% non-condensing
Altitude	Up to 1000m (3280ft) without derating, up to 4000m (13120ft) with derating
Operating Temperature	-10°C to +50°C (14°F to 122°F)