86 ACH550-UH User’s Manual
Start-Up
21: Start/Stop
This group defines how the motor starts and stops. The ACH550 supports several start and stop
modes.
Group 21: Start/Stop
Code Description Range Resolution Default S
2101 START FUNCTION 1…5 1 1 9
Selects the motor start method.
1 =
AUTO – Selects the automatic start mode.
•
VECTOR control modes: Optimal start in most cases. Flying start function to a rotating axis and start at zero
speed.
• SCALAR: FREQ mode: Immediate start from zero frequency.
2 =
DC MAGN – Selects the DC Magnetizing start mode.
Note! The DC Magnetizing start mode cannot start a rotating motor.
Note! The drive starts when the set pre-magnetizing time (param. 2103) has passed, even if motor magnetization is
not complete.
•
VECTOR control modes: Magnetizes the motor within the time determined by the parameter 2103 DC MAGN TIME
using DC current. The normal control is released exactly after the magnetizing time. This selection guarantees
the highest possible break-away torque.
•
SCALAR SPEED mode: Magnetizes the motor within the time determined by the parameter 2103 DC MAGN TIME
using DC current. The normal control is released exactly after the magnetizing time.
3 = SCALAR FLYSTART – Selects the flying start mode.
•
VECTOR control modes: Not applicable.
•
SCALAR control mode: The drive will automatically selects the correct output frequency to start a rotating motor.
Useful if the motor is already rotating and the drive will start smoothly at the current frequency.
4 =
TORQ BOOST – Selects the automatic torque boost mode (SCALAR SPEED mode only).
• May be necessary in drives with high starting torque.
• Torque boost is only applied at start, ending when output frequency exceeds 20 Hz or when output frequency is
equal to reference.
• In the beginning the motor magnetizes within the time determined by the parameter 2103 DC MAGN TIME using
DC current.
• See parameter 2110
TORQ BOOST CURR.
5 =
FLYSTART + TORQ BOOST – Selects both the flying start and the torque boost mode (SCALAR SPEED mode only).
• Flying start routine is performed first and the motor is magnetized. If the speed is found to be zero, the torque
boost is done.
2102 STOP FUNCTION 1, 2 1 1
Selects the motor stop method.
1 =
COAST – Selects cutting off the motor power as the stop method. The motor coasts to stop.
2 =
RAMP – Selects using a deceleration ramp
• Deceleration ramp is defined by 2203
DECELER TIME 1 or 2206 DECELER TIME 2 (whichever is active).
2103 DC MAGN TIME 0.00…10.00 s 0.01 s 0.30 s
Defines the pre-magnetizing time for the DC Magnetizing start mode.
• Use parameter 2101 to select the start mode.
• After the start command, the drive pre-magnetizes the motor for the time defined here, and then starts the motor.
• Set the pre-magnetizing time just long enough to allow full motor magnetization. Too long a time heats the motor
excessively.
2104 DC CURR CTL 0…2 - 0 9
Selects whether DC current is used for braking.
0 =
NOT SEL – Disables the DC current operation.
1 =
DC BRAKING – Enables the DC Injection Braking.
• Enables DC Injection braking after modulation has stopped.
• If parameter 2102 STOP FUNCTION is 1 (COAST), braking is applied after start is removed.
• If parameter 2102
STOP FUNCTION IS 2 (RAMP), braking is applied after ramp.
2106 DC CURR REF 0…100% 1% 30%
Defines the DC current control reference as a percentage of parameter 9906 (
MOTOR NOM CURR).
2107 DC BRAKE TIME 0…250 s 0.1 s 0 s
Defines the DC brake time after modulation has stopped, if parameter 2104 is 2 (
DC BRAKING).
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