Danfoss VLT FC 100 Manual page 45

VLT® FC 100 LonWorks
6.2.2. Explanation of the Control Bits
Bits 00 and 01:
Bits 00 and 01 are used to choose between the
four reference values, which are pre-program-
med in par. 3-10 Preset Reference in accord-
ance with the following table:
Programmed
ref. value
1
2
3
4
Bit 02, DC brake:
Bit 02 set to [0] leads to DC braking and stop
of the motor. Braking current and duration are
set in par. 2-01
DC Braking Time
2-02
Bit 02 set to [1] leads to ramping.
Bit 03, Coasting:
Bit 03 set to [0] causes the frequency con-
verter to immediately release of the motor
(the output transistors are "shut off"), so that
it coasts to a standstill.
Bit 03 set to [1] enables the frequency con-
verter to start the motor if other starting con-
ditions have been fulfilled.
Bit 04, Quick Stop:
Bit 04 set to [0] causes a stop in which the
motor speed is ramped down to stop via par.
3-81 Quick Stop Ramp Time
Bit 05, Hold output frequency:
Bit 05 set to [0] causes the present output
frequency (Hz) to freeze. The frozen output
frequency can then be changed only by means
Bit Bit
Parameter
01 00
3-10 [0] 0 0
3-10 [1] 0 1
3-10 [2] 1 0
3-10 [3] 1 1
NB!
Preset reference se-
In par. 8-56
lect
, a selection is made to de-
fine how Bit 00/01 gates with
the corresponding function on
the digital inputs.
DC Brake Current
and par.
.
NB!
Coasting Select
In par. 8-50
selection is made to define how
Bit 03 gates with the corre-
sponding function on a digital
input.
.
MG.11.E1.02 - VLT ® is a registered Danfoss trademark
6. How to control the Frequency Converter
of the digital inputs set by par. 5-10 to 5-15,
programmed to [Speed up] or [Speed down].
NB!
If [Freeze output] is active, the
frequency converter can only be
stopped by the following:
• Bit 03 Coasting stop
• Bit 02 DC braking
• Digital input (par. 5-10 to
5-15) programmed to DC brak-
ing, Coasting stop or Reset and
coasting stop.
Bit 06, Ramp stop/start:
Bit 06 set to [0] causes a stop, in which the
motor speed is ramped down to stop via the
selected ramp down parameter.
Bit 06 set to [1] permits the frequency con-
verter to start the motor, if other starting con-
ditions have been fulfilled.
NB!
In par. 8-53
lection is made to define how Bit
06 Ramp stop/start gates with
the corresponding function on a
digital input.
Bit 07, Reset:
Bit 07 set to [0] means no reset.
Bit 07 set to [1] resets a trip. Reset is activated
on the leading edge of the signal, i.e. when
changing from logic '0' to logic '1'.
Bit 08, Jog:
Bit 08 set to [1] causes the output frequency
, a
to be determined by par. 3-19
Bit 09, Selection of ramp '1/2:
Bit 09 set to [0] means that ramp 1 is active
(par. 3-40 to 3-47).
Bit 09 set to [1] means that ramp 2 (par. 3-50
to 3-57) is active.
Bit 10, Data not valid / Data valid:
This bit tells the frequency converter whether
the control word is to be used or ignored. Bit
10 set to [0] causes the control word to be
ignored.
Start Select
, a se-
Jog Speed .
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