Bit 02, DC brake:
Bit 02 = ’0’ leads to DC braking and stop. Set braking current and duration in par. 2-01
DC Brake Current
and par. 2-02
DC Braking Time
. Bit 02 = ’1’
leads to ramping.
Bit 03, Coasting:
Bit 03 = ’0’: The adjustable frequency drive immediately "lets go" of the motor, (the output transistors are "shut off") and it coasts to a standstill. Bit 03
= ’1’: The adjustable frequency drive starts the motor if the other starting conditions are met.
NOTE!
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
Terminal
18 Digital Input
to par. 5-15
Terminal 33 Digital Input
) programmed to
Speed up
and
Slow-down
.
NOTE!
If freeze output is active, the adjustable frequency drive can only be stopped by the following:
• Bit 03 Coasting stop
•Bit 02 DC braking
• Digital input (par. 5-10
Terminal 18 Digital Input
to par. 5-15
Terminal 33 Digital Input
) 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 parameter. Bit 06 = ’1’: Permits the adjustable
frequency drive to start the motor, if the other starting conditions are met.
NOTE!
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 leading edge of the signal, 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 [RPM]
.
Bit 09, Selection of ramp 1/2:
Bit 09 = "0": Ramp 1 is active (par. 3-41
Ramp 1 Ramp Up Time
to par. 3-42
Ramp 1 Ramp Down Time
). Bit 09 = "1": Ramp 2 (par. 3-51
Ramp 2 Ramp
Up Time
to par. 3-52
Ramp 2 Ramp Down Time
) is active.
7 RS-485 Installation and Set-up VLT
®
AQUA Drive Design Guide
7-26
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
7
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