Operating instructions

3.7.3 5-1* Digital Inputs continued
All = Terminals 18, 19, 27, 29, 32, 33, X30/2, X30/3, X30/4. X30/
are the terminals on MCB 101.
Functions dedicated to only one digital input are stated in the
associated parameter.
All digital inputs can be programmed to these functions:
[0] No
operation
No reaction to signals transmitted to terminal.
[1] Reset Resets frequency converter after a TRIP/ALARM.
Not all alarms can be reset.
[2] Coast
inverse
Leaves motor in free mode. Logic ‘0’ => coasting
stop.
(Default Digital input 27): Coasting stop,
inverted input (NC).
[3] Coast and
reset
inverse
Reset and coasting stop Inverted input (NC).
Leaves motor in free mode and resets the
frequency converter. Logic ‘0’ => coasting stop
and reset.
[5] DC-brake
inverse
Inverted input for DC braking (NC).
Stops motor by energizing it with a DC current
for a certain time period. See par. 2-01 DC Brake
Current to par. 2-03 DC Brake Cut In Speed [RPM].
The function is only active when the value in
par. 2-02 DC Braking Time is different from 0.
Logic ’0’ => DC braking.
[6] Stop
inverse
Stop Inverted function. Generates a stop
function when the selected terminal goes from
logical level ‘1’ to ‘0’. The stop is performed
according to the selected ramp time
(par. 3-42 Ramp 1 Ramp Down Time,
par. 3-52 Ramp 2 Ramp Down Time,
par. 3-62 Ramp 3 Ramp down Time,
par. 3-72 Ramp 4 Ramp Down Time).
NOTE
When the frequency converter is at the
torque limit and has received a stop
command, it may not stop by itself. To
ensure that the frequency converter
stops, configure a digital output to
Torque limit & stop [27] and connect
this digital output to a digital input
that is configured as coast.
[7] External
Interlock
Same function as Coasting stop, inverse, but
External Interlock generates the alarm
message ’external fault’ on the display when the
terminal which is programmed for Coast Inverse
is logic ‘0’. The alarm message will also be active
via digital outputs and relay outputs, if program-
med for External Interlock. The alarm can be
reset using a digital input or the [RESET] key if
the cause for the External Interlock has been
removed. A delay can be programmed in
par. 22-00 External Interlock Delay, External
Interlock Time. After applying a signal to the
input, the reaction described above will be
delayed with the time set in par. 22-00 External
Interlock Delay.
[8] Start Select start for a start/stop command. Logic ‘1’ =
start, logic ‘0’ = stop.
(Default Digital input 18)
[9] Latched
start
Motor starts, if a pulse is applied for min. 2 ms.
Motor stops when Stop inverse is activated
[10] Reversing Changes direction of motor shaft rotation. Select
Logic ‘1’ to reverse. The reversing signal only
changes the direction of rotation. It does not
activate the start function. Select both directions
in par. 4-10 Motor Speed Direction.
(Default Digital input 19).
[11] Start revers-
ing
Used for start/stop and for reversing on the
same wire. Signals on start are not allowed at
the same time.
[14] Jog Used for activating jog speed. See par. 3-11 Jog
Speed [Hz].
(Default Digital input 29)
[15] Preset
reference
on
Used for shifting between external reference
and preset reference. It is assumed that External/
preset [1] has been selected in
par. 3-04 Reference Function. Logic '0' = external
reference active; logic '1' = one of the eight
preset references is active.
[16] Preset ref
bit 0
Enables a choice between one of the eight
preset references according to the table below.
[17] Preset ref
bit 1
Enables a choice between one of the eight
preset references according to the table below.
[18] Preset ref
bit 2
Enables a choice between one of the eight
preset references according to the table below.
Preset ref. bit 2 1 0
Preset ref. 0 0 0 0
Preset ref. 1 0 0 1
Preset ref. 2 0 1 0
Preset ref. 3 0 1 1
Preset ref. 4 1 0 0
Preset ref. 5 1 0 1
Preset ref. 6 1 1 0
Preset ref. 7 1 1 1
[19] Freeze ref Freezes actual reference. The frozen reference is
now the point of enable/condition for Speed up
and Speed down to be used. If Speed up/down
is used, the speed change always follows ramp 2
(par. 3-51 Ramp 2 Ramp Up Time and
par. 3-52 Ramp 2 Ramp Down Time) in the range
0 - par. 3-03 Maximum Reference. (For closed
loop see par. 20-14 Maximum Reference/Feedb.).
[20] Freeze
output
Freezes actual motor frequency (Hz). The frozen
motor frequency is now the point of enable/
condition for Speed up and Speed down to be
used. If Speed up/down is used, the speed
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 59
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