GE AF-650 GP Programming Manual page 77

Parameter Descriptions
H-78 Missing Motor Phase Function
Option:
3 3
[0] Disabled
[1] Trip 100 ms
[2] Trip 1000 ms
*
[3] Trip 100 ms lim 3
phase detec.
[5] Motor Check
3.7.8 H-8# Stop Adjustments
Parameters to configure the special stop features for the
motor and Load Type and Min/Max Inertia.
H-80 Function at Stop
Option:
[0] Coast
*
[1] DC hold
[2] Motor check
[3] Pre-
magnetizing
76
Function:
NOTICE
This parameter cannot be
adjusted while the motor is
running.
Shows an alarm if motor phase is
missing.
No alarm is shown if a missing motor
phase occurs.
An alarm is shown if a missing motor
phase occurs.
Function:
Select the frequency converter function
after a stop command or after the speed is
deceled to the settings in
parameter H-81 Min Speed for Function at
Stop [RPM].
Leaves motor in free mode. The motor is
disconnected from the frequency converter.
Energizes the motor with a DC hold current
(see parameter B-00 DC Hold Current).
Checks if a motor has been connected.
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
premagnetizing function does not help the
very first start command.
Two different solutions are available to
premagnetize the machine for the first start
command:
1. Start the frequency converter with
a 0 RPM reference and wait 2-4
rotor time constants before
increasing the speed reference.
2. Set parameter F-24 Holding Time to
the required premagnetizing time
(2–4 rotor time constants. See the
02/2016 All rights reserved.
H-80 Function at Stop
Option: Function:
time constants description further
in this section).
3. Set parameter F-25 Start Function
to either [0] DC hold or [1] DC
Brake.
4. Set the DC hold or DC brake
current magnitude
(parameter B-00 DC Hold Current or
parameter B-01 DC Brake Current)
to be equal to I_pre-mag = Unom/
(1.73 x Xh)
Sample rotor time constants =
(Xh+X2)/(6.3*Freq_nom*Rr)
1 kW = 0.2 s
10 kW = 0.5 s
100 kW = 1.7 s
1000 kW = 2.5 s
[4] DC Voltage U0 When the motor is stopped, the
parameter H-55 U/f Characteristic - U [0]
defines the voltage at 0 Hz.
[5] Coast at low When the reference is below
reference parameter H-81 Min Speed for Function at
Stop [RPM], the motor is disconnected from
the frequency converter.
[6] Motor check,
alarm
H-81 Min Speed for Function at Stop [RPM]
Range: Function:
3 RPM [0 - 600 RPM] Set the speed at which to activate
*
parameter H-80 Function at Stop.
H-82 Min Speed for Function at Stop [Hz]
Range: Function:
0.1 Hz [0 - 20.0 Hz] Set the output frequency at which to
*
activate parameter H-80 Function at Stop.
H-83 Precise Stop Function
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
Valid for AF-650 GP only.
[0] Precise Only optimal when the operational speed, for
ramp example the operational speed of a conveyor belt
*
stop is constant. This is an open-loop control. Achieves
high repetitive precision at the stop point.
[1] Cnt stop Counts the number of pulses, typically from an
with encoder, and generates a stop signal after a pre-
reset programmed number of pulses, defined in
DET-618D