transistors are turned off), which means that the motor
runs freely to stop. Logic '0' leads to coasting to stop.
Reset and coasting inverse
are used to activate motor coast
simultaneously with reset. Logical '0' means motor coast
stop and reset. Reset is activated on the falling edge.
Quick stop inverse
is used for activating the quick-stop
ramp down set in
parameter 212 Quick stop ramp-down
time.
Logic '0' leads to quick stop.
DC-braking inverse
is used for stopping the motor by
energising it with a DC voltage for a given time, see
parameters 126, 127 and 132 DC brake
. Note that this
function is only active if the value in
parameters 126 DC
braking time
and
132 DC brake voltage
is different from 0.
Logic '0' leads to DC braking.
Stop inverse
, a logic '0' means that the motor speed is
ramped down to stop via the selected ramp.
Select
Start
if a start/stop command is required. Logic '1' =
start, logic '0' = stop.
Illustration 4.13 Start and Stop Commands
Latched start
, if a pulse is applied for mininum 14 ms, the
frequency converter starts the motor, provided no stop
command has been given. The motor can be stopped by
briefly activating
Stop inverse
.
Select
Reversing
to change the direction of rotation of the
motor shaft. Logic '0' does not lead to reversing. Logic '1'
leads to reversing. The reverse signal only changes the
direction of rotation, it does not activate the start. Is not
active at
Process regulation, closed loop
. See also
chapter 4.3.1 Output frequency range parameter 200
.
Reversing and start
is used for start/stop and for reversing
with the same signal. No active start command is allowed
at the same time. Acts as latch start reversing, provided
latch start has been selected for terminal 18. Is not active
for
Process regulation, closed loop
. See also
chapter 4.3.1 Output frequency range parameter 200
.
Use
Start clockwise
to configure the motor to only rotate
clockwise when started. Should not be used for
Process
regulation, closed loop
.
Use
Start anticlockwise
to configure the motor to rotate
counter-clockwise when started. Should not be used for
Process regulation, closed loop
. See also
Jog is used to override the output frequency to the jog
frequency set in
parameter 213 Jog frequency
. Jog is active
regardless of whether a start command has been given,
yet not when
Coast stop
,
Quick-stop
or
DC braking
are
active.
Freeze reference
freezes the present reference. The
reference can now only be changed via
Speed up
and
Speed down
. If
freeze reference
is active, it is saved after a
stop command and in the event of mains failure.
Freeze output
freezes the present output frequency (in Hz).
The output frequency can now only be changed via
Speed
up
and
Speed down
.
Speed up
and
Speed down
are selected if digital control of
the up/down speed is required. This function is only active
if
Freeze reference
or
Freeze output frequency
has been
selected.
If
Speed up
is active, the reference or output frequency is
increased, and if
Speed down
is active the reference or
output frequency is reduced. The output frequency is
changed via the preset ramp times in
parameters 209-210
Ramp 2
.
One pulse (logic '1' minimum high for 14 ms and a
minimum break time of 14 ms) leads to a speed change of
0.1 % (reference) or 0.1 Hz (output frequency).
Term.
29
Term.
33
Freeze ref/freeze
outp.
Function
0
0
1
No speed change
0
1
1
Speed up
1
0
1
Speed down
1
1
1
Speed down
Table 4.3 Speed-up and Speed-down Functions
Freeze reference
can be changed even if the frequency
converter has stopped. The reference is also saved if the
mains are disconnected.
Catch-up/Slow-down
is selected if the reference value is to
be increased or reduced by a programmable percentage
value set in parameter
219 Catch-up/Slow-down reference
.
Slow-down
Catch-up
Function
0
0
Unchanged speed
0
1
Increase by % value
1
0
Reduce by % value
1
1
Reduce by % value
Table 4.4 Slow-down and Catch-up Functions
Programming
Design Guide
MG27E402
Danfoss A/S © Rev. May/2014 All rights reserved.
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