Danfoss VLT 6000 HVAC

VLT
®
6000 HVAC
87MG.60.B1.02 - VLT is a registered Danfoss trade mark
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
Programming
117 Motor thermal protection
(MOT. THERM PROTEC)
Value:
No protection (NO PROTECTION) [0]
Thermistor warning (THERMISTOR WARNING) [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 VLT 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 analogue
input terminals 53 and 54.
- Calculation of the thermal load (ETR - Electronic
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
required 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 VLT frequency converter can also be program-
med to give off a warning signal via one of the digital
outputs.
Select ETR Trip 1-4 if tripping is desired when the mo-
tor is overloaded according to the calculations.