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.
NB!
Make a selection in par. 8-50
Coasting Select
to define how Bit 03 gates with the
corresponding function on a digital input.
Bit 04, Quick stop:
Bit 04 = ’0’: Makes the motor speed ramp down to stop (set in par. 3-81
Quick Stop Ramp
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
Speed up
and
Slow down
.
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
DC braking
,
Coasting
stop
, or
Reset
and
coasting stop
.
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.
NB!
Make a selection in par. 8-53
Start Select
to define how Bit 06 Ramp stop/start gates
with the corresponding function on a digital input.
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
Jog Speed
.
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.
VLT
®
HVAC Drive Design Guide
7. RS-485 Installation and Set-up
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
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