output frequency equals
parameter 130 Start frequency
and
the output voltage is equal to parameter
131 Voltage at
start
. This functionality is used typically for hoist
applications with counterweight. It is particularly used in
for applications in which a cone anchor motor is applied.
The cone anchor motor can break away using
parameter
130 Start frequency
and
parameter 131 Voltage at start
.
122
Function at stop
Value:
Coasting (COAST)
[0]
DC hold (DC HOLD)
[1]
Function:
Select the function of the frequency converter after the
output frequency has become lower than the value in
parameter 123 The min. frequency for activation of function
at stop
or after a stop command and when the output
frequency has been ramped down to 0 Hz.
Description of choice:
Select
[0] Coasting
if the frequency converter is to 'let go'
of the motor (inverter turned off).
Select
[1] DC hold
if
parameter 137 DC hold voltage
is to be
activated.
123
Min. frequency for activation of function at
stop
Value:
0,1-10 Hz
0,1 Hz
Function:
In this parameter, the output frequency is set at which the
function selected in
parameter 122 Function at stop
is to be
activated.
Description of choice:
Set the required output frequency.
If
parameter 123
is set too high, and DC hold has been
select in
parameter 122
, the output frequency jumps to the
value in
parameter 123
without ramping up. This may
cause an overcurrent warning / alarm.
NOTICE
If
parameter 123
is set higher than
parameter 130
, then
the start delay function
(parameters 120 and 121)
is
skipped.
CAUTION
If
parameter 123
is set too high, and DC hold is selected
in
parameter 122
, the output frequency jumps to the
value in
parameter 123
without ramping up. This may
cause an overcurrent warning or alarm.
During DC braking DC voltage is supplied to the motor,
and this causes the shaft to be brought to a standstill. In
parameter 132 DC brake voltage
DC brake voltage can be
preset from 0-100%. Max. DC brake voltage depends on
the motor data selected.
In
parameter 126 DC braking time
DC braking time is
determined, and in
parameter 127 DC brake cut-in frequency
the frequency at which DC braking becomes active is
selected. If a digital input is programmed to
[5] DC braking
inverse
and shifts from logic '1' to logic '0', DC braking is
activated. When a stop command becomes active, DC
braking is activated when the output frequency is less than
the brake cut-in frequency.
WARNING
Do not use DC braking if the inertia in the motor shaft is
more than 20 times greater than the motor's internal
inertia.
126
DC brake time
Value:
0 - 60 s
10 s
Function:
In this parameter, the DC brake time is set at which
parameter 132 DC brake voltage
is to be active.
Description of choice:
Set the required time.
127
DC brake cut-in frequency
Value:
0.0 (OFF) - par. 202
Output frequency high limit, f
MAX
OFF
Function:
In this parameter, the DC brake cut-in frequency is set at
which the DC brake is to be activated in connection with a
stop command.
Description of choice:
Set the required frequency.
128
Thermal motor protection
Value:
No protection (NO PROTECTION)
[0]
Thermistor warning
(THERMISTOR WARN)
[1]
Thermistor trip (THERMISTOR TRIP)
[2]
ETR warning 1 (ETR WARNING 1)
[3]
ETR trip 1 (ETR TRIP 1)
[4]
ETR warning 2 (ETR WARNING 2)
[5]
ETR trip 2 (ETR TRIP 2)
[6]
ETR warning 3 (ETR WARNING 3)
[7]
ETR trip 3 (ETR TRIP 3)
[8]
ETR warning 4 (ETR WARNING 4)
[9]
ETR trip 4 (ETR TRIP 4)
[10]
Function:
The frequency converter can monitor the motor
temperature in 2 different ways:
Programming
Design Guide
72
Danfoss A/S © Rev. May/2014 All rights reserved.
MG27E402
4
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