Danfoss VLT Series Design Manual page 147

®
VLT HVAC Drive Design Guide
Bit 03, Coasting:
Bit 03 = '0': The frequency converter immediately "lets go" of the motor, (the output transistors
are "shut off") and it coasts to a standstill. Bit 03 = '1': The frequency converter starts the motor
if the other starting conditions are met.
Bit 04, Quick stop:
Bit 04 = '0': Makes the motor speed ramp down to stop (set in par. 3-81
Time
.
Bit 05, Hold output frequency
Bit 05 = '0': The present output frequency (in Hz) freezes. Change the frozen output frequency
only by means of the digital inputs (par. 5-10 to 5-15) programmed to
Bit 06, Ramp stop/start:
Bit 06 = '0': Causes a stop and makes the motor speed ramp down to stop via the selected ramp
down par. Bit 06 = '1': Permits the frequency converter to start the motor, if the other starting
conditions are met.
Bit 07, Reset: Bit 07 = '0': No reset. Bit 07 = '1': Resets a trip. Reset is activated on the signal's
leading edge, i.e. when changing from logic '0' to logic '1'.
Bit 08, Jog:
Bit 08 = '1': The output frequency is determined by par. 3-19
Bit 09, Selection of ramp 1/2:
Bit 09 = "0": Ramp 1 is active (par. 3-40 to 3-47). Bit 09 = "1": Ramp 2 (par. 3-50 to 3-57) is
active.
Bit 10, Data not valid/Data valid:
Tell the frequency converter whether to use or ignore the control word. Bit 10 = '0': The control
word is ignored. Bit 10 = '1': The control word is used. This function is relevant because the
telegram always contains the control word, regardless of the telegram type. Thus, you can turn
off the control word if you do not want to use it when updating or reading parameters.
NB!
Make a selection in par. 8-50
corresponding function on a digital input.
NB!
If Freeze output is active, the frequency converter can only be stopped by the fol-
lowing:
• Bit 03 Coasting stop
• Bit 02 DC braking
• Digital input (par. 5-10 to 5-15) programmed to
stop Reset coasting stop
, or and
NB!
Make a selection in par. 8-53
with the corresponding function on a digital input.
®
MG.11.B2.02 - VLT is a registered Danfoss trademark
7. RS-485 Installation and Set-up
Coasting Select
to define how Bit 03 gates with the
.
Start Select
to define how Bit 06 Ramp stop/start gates
Jog Speed
Quick Stop Ramp
Speed up Slow down
and .
DC braking Coasting
,
.
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