ABB ACS355 series User Manual

286 Actual signals and parameters
4304 FORCED
OPEN LVL
Defines the speed at brake release. Parameter setting
overrides parameter 4302 BRAKE OPEN LVL setting. After
start, the drive speed is frozen to the set value, until the
motor is magnetized.
The purpose of this parameter is to generate enough start
torque to prevent the motor rotating into the wrong direction
because of the motor load.
0.0 =
NOT SEL
0.0 = NOT SEL
0.0…100.0%
Value as a percentage of the maximum frequency (in scalar
control) or the maximum speed (in vector control). If
parameter value is set to zero, the function is disabled. The
control mode is selected by parameter 9904 MOTOR CTRL
MODE.
1 = 0.1%
4305 BRAKE MAGN
DELAY
Defines motor magnetizing time. After start drive
current/torque/speed is frozen to the value defined by
parameter 4302 BRAKE OPEN LVL or 4304 FORCED
OPEN LVL for the set time.
0 = NOT
SEL
0 = NOT SEL
0…10000 ms
magnetizing time. If parameter value is set to zero, the
function is disabled.
1 = 1 ms
4306 RUNTIME
FREQ LVL
Defines the brake close speed. When frequency falls below
the set level during run, the brake is closed. The brake is re-
opened when the requirements set by parameters
4301…4305 are met.
0.0 =
NOT SEL
0.0 = NOT SEL
0.0…100.0%
Value as a percentage of the maximum frequency (in scalar
control) or the maximum speed (in vector control). If
parameter value is set to zero, the function is disabled. The
control mode is selected by parameter 9904 MOTOR CTRL
MODE.
1 = 0.1%
4307 BRK OPEN
LVL SEL
Selects the torque (in vector control) or current (in scalar
control) applied at brake release.
PAR 4302
PAR 4302 Value of parameter 4302 BRAKE OPEN LVL used. 1
MEMORY Torque value (in vector control) or current value (in scalar
control) saved in parameter 0179 BRAKE TORQ MEM
used.
Useful in applications where initial torque is needed to
prevent unintended movement when the mechanical brake
is released.
2
50 ENCODER Encoder connection.
For more information, see MTAC-01 pulse encoder interface
module user’s manual (3AFE68591091 [English]).
5001 PULSE NR States the number of encoder pulses per one revolution. 1024 ppr
32…16384 ppr Pulse number in pulses per round (ppr) 1 = 1 ppr
All parameters
No. Name/Value Description Def/FbEq

ABB ACS355 series Specifications

General

Power Range	0.37 to 22 kW
Protection Class	IP20
Output Frequency	0 to 500 Hz
Braking Chopper	Built-in
Control Method	Scalar control, Vector control
Ambient Temperature	-10 to +50 °C
Communication Protocols	Modbus, CANopen
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature
Cooling Method	Air-cooled
Number of Phases	3-phase