Bit Bit value=0 Bit value=1
00 Reference value external selection lsb
01 Reference value external selection msb
02 DC brake Ramp
03 Coasting No coasting
04 Quick stop Ramp
05 Hold output
frequency
use ramp
06 Ramp stop Start
07 No function Reset
08 No function Jog
09 Ramp 1 Ramp 2
10 Data invalid Data valid
11 Relay 01 open Relay 01 active
12 Relay 02 open Relay 02 active
13 Parameter set-up selection lsb
15 No function Reverse
Table 8.36
Explanation of the Control Bits
Bits 00/01
Bits
00
and 01 are used to choose between the four
reference values, which are pre-programmed in 3-10 Preset
Reference according to the Table 8.37
.
Programmed
ref. value
Parameter Bit
01
Bit
00
1
3-10 Preset Reference [0]
0 0
2
3-10 Preset Reference [1]
0 1
3
3-10 Preset Reference [2]
1 0
4
3-10 Preset Reference [3]
1 1
Table 8.37 Control bits
NOTE
Make
a selection in 8-56 Preset Reference Select to define
how Bit 00/01 gates with the corresponding function on
the digital inputs.
Bit 02, DC brake
Bit 02=’0’ leads to DC braking and stop. Set braking
current and duration in 2-01 DC Brake Current and 2-02 DC
Braking Time.
Bit
02=’1’ leads to ramping.
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.
Make a selection in 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 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 with the digital
inputs (5-10 Terminal 18 Digital Input to 5-13 Terminal 29
Digital Input) programmed to Speed up=21 and Slow
down=22.
NOTE
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 (5-10 Terminal 18 Digital Input
to
5-13 Terminal 29 Digital Input) programmed to DC
braking=5, Coasting stop=2, or Reset and coasting
stop=3.
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 Frequency converter to start the motor,
if the other starting conditions are met.
Make a selection in 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 3-11 Jog
Speed [Hz].
Bit 09, Selection of ramp 1/2
Bit 09="0": Ramp 1 is active (3-41 Ramp 1 Ramp up Time
to
3-42 Ramp 1 Ramp Down Time).
Bit 09="1": Ramp 2 (3-51 Ramp 2 Ramp up Time to
3-52 Ramp 2 Ramp down Time) is active.
RS-485 Installation and Set...
VLT
®
Micro Drive FC 51 Design Guide
MG02K202 - VLT
®
is a registered Danfoss trademark
85
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