Danfoss FC 300 Series User Manual

NOTE!
To obtain the best flying start performance, the advanced
motor data parameters 1-30 thru 1-35 must be correct.
1-74 Start Speed [RPM]
Range: Function:
Application
dependent
*
[0 - 600
RPM]
Set a motor start speed. After the
start signal, the output speed leaps
to set value. Set the start function in
1-72 Start Function to [3], [4] or [5],
and set a start delay time in 1-71 Start
Delay.
1-75 Start Speed [Hz]
Range: Function:
Application
dependent
*
[Application
dependant]
This parameter can be used for
hoist applications (cone rotor). Set
a motor start speed. After the start
signal, the output speed leaps to
set value. Set the start function in
1-72 Start Function to [3], [4] or [5],
and set a start delay time in
1-71 Start Delay.
1-76 Start Current
Range: Function:
0.00
A
*
[Application
dependant]
Some motors, e.g., cone rotor motors,
need extra current/starting speed to
disengage the rotor. To obtain this boost,
set the required current in 1-76 Start
Current. Set 1-74 Start Speed [RPM]. Set
1-72 Start Function to [3] or [4], and set a
start delay time in 1-71 Start Delay.
This parameter can be used for hoist
applications (cone rotor).
3.3.8 1-8* Stop Adjustments
1-80 Function at Stop
Option: Function:
Select the adjustable frequency drive
function after a stop command or after the
speed is ramped down to the settings in
1-81 Min Speed for Function at Stop [RPM].
[0]
*
Coast Leaves motor in free mode. The motor is
disconnected from the adjustable frequency
drive.
[1] DC hold Energizes motor with a DC holding current
(see 2-00 DC Hold Current).
[2] Motor check Checks if a motor has been connected.
1-80 Function at Stop
Option: Function:
[3] Pre-
magnetizing
Builds up a magnetic field while the motor is
stopped. This allows the motor to produce
torque quickly at subsequent start commands
(asynchronous motors only). This pre-
magnetizing function does not help the very
first start command. Two different solutions
are available to pre-magnetize the machine
for the first start command:
1. Start the drive with a 0 RPM
reference and wait 2 to 4 rotor time
constants (see below) before
increasing the speed reference.
2a. Set par 1-71 Start Delay to the
desired pre-mag time (2 to 4 rotor
time constants - see below).
2b. Set par 1-72 to either [0] DC-
hold or [1] DC-Brake.
Set the DC-hold or DC-brake current
magnitude (2-00 or 2-01) to be
equal to I_pre-mag = Unom / (1.73 x
Xh)
Sample rotor time constants =
(Xh+X2) / (6.3*Freq_nom*Rr)
1.35 hp [1kW] = 0.2 seconds
13.5 hp [10kW] = 0.5 seconds
135 hp [100kW] = 1.7 seconds
1350 hp [1000kW] = 2.5 seconds
[4] DC Voltage U0 When the motor is stopped, the P1-55 [0]
parameter defines the voltage at 0Hz.
[5] Coast at low
reference
When the reference is below par. 1-81 Min
Speed for Function at Stop [RPM], the motor
is disconnected from the adjustable
frequency drive.
1-81 Min Speed for Function at Stop [RPM]
Range: Function:
Application
dependent
*
[0 - 600 RPM] Set the speed at which to
activate 1-80 Function at
Stop.
1-82 Min Speed for Function at Stop [Hz]
Range: Function:
Application
dependent
*
[Application
dependant]
Set the output frequency
at which to activate
1-80 Function at Stop.
The precise stop functions are advantageous in applications
where high precision is required.
Parameter Descriptions FC 300 Programming Guide
3-22 MG.33.MA.22 - VLT
®
is a registered Danfoss trademark
3
3

Danfoss FC 300 Series Specifications

General

Brand	Danfoss
Model	FC 300 Series
Category	DC Drives
Language	English