Danfoss VLT 6000 HVAC Manual de servicio descargar pdf (Pagina 85)

VLT

6000 HVAC

85MG.60.B1.02 - VLT is a registered Danfoss trade mark

★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port

Programming

109 Resonance damping

(RESONANCE DAMP.)

Value:

0 - 500 % ★100 %

Function:

High-frequency electric resonance problems between

the VLT frequency converter and the motor can be

eliminated by adjusting the resonance damping.

Description of choice:

Adjust the damping percentage until the motor

resonance has disappeared.

110 High break-away torque

(HIGH START TORQ.)

Value:

0.0 - 0.5 sec. ★ 0.0 sec.

Function:

In order to secure a high starting torque, the

maximum torque for max. 0.5 sec. is allowed.

However, the current is limited by the protection limit

of the VLT frequency converter (inverter).

0 sec. corresponds to no high break-away torque.

Description of choice:

Set the necessary time in which a high starting torque

is desired.

111 Start delay (START DELAY)

Value:

0.0 - 120.0 sec. ★ 0.0 sec.

Function:

This parameter enables a delay of the starting time

after the conditions for start have been fulfilled. When

the time has passed, the output frequency will start

by ramping up to the reference.

Description of choice:

Set the desired time until acceleration is to begin.

112 Motor preheater (MOTOR PREHEAT)

Value:

✭ Disable (DISABLE) [0]

Enable (ENABLE) [1]

Function:

The motor preheater ensures that no condensate

develops in the motor at stop. This function can also

be used to evaporate condensed water in the motor.

The motor preheater is only active during stop.

Description of choice:

Select Disable [0] if this function is not required.

Select Enable [1] to activate motor preheating. The

DC current is set in parameter 113 Motor preheater

DC current.

113 Motor preheater DC current

(PREHEAT DC-CURR.)

Value:

0 - 100 % ★ 50 %

The maximum value depends on the rated motor

current, parameter 105 Motor current, I

M,N

Function:

The motor can be preheated at stop by means of a

DC current to prevent moisture from entering the

motor.

Description of choice:

The motor can be preheated by means of a DC

current. At 0%, the function is inactive; at a value

higher than 0%, a DC current will be supplied to the

motor at stop (0 Hz). In fans that rotate because of

the air flow when they are not in operation

(windmilling), this function can also be used to

generate a holding torque.

If too high a DC current is supplied for too

long, the motor can be damaged.

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Danfoss VLT 6000 HVAC Manual de servicio Pagina 85

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