Danfoss VLT HVAC Drive FC 102 Design Manual page 202

Installation and Set-up
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 Table 7.35:
Programmed ref.
value
1
2
3
4
7 7
Table 7.35 Explanation of the Control Bits
NOTICE!
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 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.
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 by means of the
digital inputs (5-10 Terminal 18 Digital Input to
5-15 Terminal 33 Digital Input) programmed to Speed up
and Slow-down.
200
Design Guide
Parameter Bit 01
3-10 Preset 0
Reference [0]
3-10 Preset 0
Reference [1]
3-10 Preset 1
Reference [2]
3-10 Preset 1
Reference [3]
Danfoss A/S © Rev. 2014-01-13 All rights reserved.
NOTICE!
If freeze output is active, the adjustable frequency drive
can only be stopped by the following:
•
Bit 03 coasting stop
•
Bit 02 DC braking
Bit 00
•
Digital input (5-10 Terminal 18 Digital Input to
0
5-15 Terminal 33 Digital Input) programmed to
DC braking, coasting stop, or reset and coasting
1
stop.
0
Bit 06, Ramp stop/start:
Bit 06 = '0': Causes a stop and makes the motor speed
1
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.
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, when changing
from logic '0' to logic '1', for example.
Bit 08, Jog:
Bit 08 = '1': The output frequency is determined by
3-19 Jog Speed [RPM].
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.
Bit 10, Data not valid/Data valid:
Tell the adjustable frequency drive 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 message always contains
the control word, regardless of the message type. It is
possible to turn off the control word if not in use when
updating or reading parameters.
MG16C122