Danfoss VLT 6000 HVAC Manual de Serviço descarregar pdf (Página 87)

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.

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 176 177

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