VLT® 5000 Crane
Programming
105 MOTOR CURRENT
Value:
0.01 - I
VLT,MAX
✭ Depends on the choice of motor
Function:
The rated motor current I
M,N
forms part of the
frequency converter calculations ia. of torque
and motor thermal protection.
Description of choice:
Select a value that equals the nameplate
data on the motor.
Enter the value in Ampere.
NB!:
It is important to enter the correct value, since
this forms part of the Flux Vector control feature.
106 MOTOR NOM. SPEED
Value:
100-5000 rpm
✭ Depends on the choice of motor.
Function:
This is where the value corresponding to the rated
motor speed n
M,N
(shown on the nameplate) is selected
Description of choice:
The rated motor speed n
M,N
is used ia. for calculating
the optimal slip compensation.
NB!:
It is important to enter the correct value,
sincethisformspartoftheFluxVector
control feature. The max. value equals f
M,N
x 60. Set f
M,N
in parameter 104.
122 FUNCTION AT STOP
Value:
✭Coasting (COAST)
[0]
DC-hold (DC-HOLD)
[1]
Motor check (MOTOR CHECK)
[2]
Function:
This parameters makes it possible to select the function
of the frequency converter after a stop command or
when the speed has been ramped down to 0 RPM.
Description of choice:
Select Coasting [0] if the frequency converter is to
’let go’ of the motor (inverter closed).
Select DC-hold [1] when a DC holding current set
in parameter 124 is to be activated.
Select Motor check [2] if the frequency converter is to
check whether or not a motor has been connected.
124 DC-HOLD CURRENT
Value:
✭ 50 %
Function:
This parameter is used to maintain the motor function
(holding torque) or to pre-heat the motor.
NB!:
The maximum value depends on the
rated motor current.
Description of choice:
This parameter can only be used if DC hold [1]
has been selected in parameter 122. Set it as
a percentage value in relation to the rated motor
current I
M,N
set in parameter 105.
100% DC holding current corresponds to I
M,N.
Warning: 100 % supply for too long
may damage the motor.
128 MOT. THERM. PROTEC
Value:
✭No protection (NO PROTECTION)
[0]
Thermistor warning (THERMISTOR WARN)
[1]
Thermistor trip (THERMISTOR TRIP)
[2]
ETR Warning 1 (ETR WARNING1)
[3]
ETR Trip 1 (ETR TRIP1)
[4]
Function:
The frequency converter is able to monitor the motor
temperature in two different ways:
- Via a thermistor sensor connected to the analogue
input, terminal 53 (parameter 308).
- Calculation of the thermal load, based on the
current load and the time. This is compared with
the rated motor current I
M,N
and the rated motor
frequency f
M,N
. The calculations made take into
account the need for a lower load at lower speeds
because of less cooling from the fan.
For the North American market: The ETR functions
provide class 20 motor overload protection
in accordance with NEC.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.50.N4.02 - VLT is a registered Danfoss trademark
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