Danfoss VLT 6000 HVAC Servisní příručka stáhnout pdf (Strana 86)

VLT

6000 HVAC

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

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

Make sure not to supply too high a braking

current for too long, since otherwise the

motor will be damaged because of

mechanical overload or the heat generated in the

motor.

115 DC braking time

(DC BRAKE TIME)

Value:

0.0 - 60.0 sec. ✭ 10.0 sec.

Function:

This parameter is for setting the DC braking time for

which the DC braking current (parameter 113) is to

be active.

Description of choice:

Set the desired time.

116 DC brake cut-in frequency

(DC BRAKE CUT-IN)

Value:

0.0 (OFF) - par. 202 Output frequency

high limit, f

MAX

✭ OFF

Function:

This parameter is used for setting the DC brake cut-in

frequency at which DC braking is to be activated in

connection with a stop command.

Description of choice:

Set the desired frequency.

■■

■ DC braking

In DC braking, the motor receives a DC current that

brings the shaft to a halt. Parameter 114 DC braking

current, decides the DC braking current as a

percentage of the rated motor current I

M,N

In parameter 115 DC braking time, the DC braking

time is selected, and in parameter 116 DC brake cut-

in frequency, the frequency is selected at which DC

braking becomes active.

If terminal 19 or 27 (parameter 303/304 Digital input)

has been programmed to DC braking inverse and

shifts from logic ‘1’ to logic ‘0’, the DC braking will be

activated.

When the start signal on terminal 18 changes from

logic ‘1’ to logic ‘0’, the DC braking will be activated

when the output frequency becomes lower than the

brake coupling frequency.

NB!

The DC brake is not to be used if the inertia of

the motor shaft is more than 20 times the inertia of

the motor itself.

114 DC braking current

(DC BRAKE CURRENT)

Value:

0 - ★ 50 %

The maximum value depends on the rated motor

current. If the DC braking current is active, the VLT

frequency converter has a switching frequency of 4 kHz.

Function:

This parameter is used for setting the DC braking

current that is activated upon a stop when the DC

brake frequency set in parameter 116 DC brake cut-in

frequency has been reached, or if DC brake inverse is

active via terminal 27 or via the serial communication

port. The DC braking current will be active for the

duration of the DC braking time set in parameter 115

DC braking time.

Description of choice:

To be set as a percentage value of the rated motor

current I

M,N

set in parameter 105 Motor current, I

VLT,N

100% DC braking current corresponds to I

M,N

VLT,MAX

M,N

x 100 [%]

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