ABB DCS 500B Description page 4

Contents
Limitation of the reference.........................................................................................28
Passing of the RAMP function...................................................................................28
Output follows the speed actual ................................................................................28
Reset the output........................................................................................................28
Acceleration compensation .......................................................................................28
• Speed Control ......................................................................................................................30
REFSUM_2 function block.............................................................................................30
SPEED_ERROR function block .....................................................................................30
Speed Step for testing...............................................................................................30
Error value filter.........................................................................................................30
Window Control Principle ..........................................................................................31
Application example for Window Control ...................................................................31
Enabling the Window Control ....................................................................................31
Determining the Window Size ...................................................................................31
Output connection points ..........................................................................................31
SPEED_CONTROL function block ................................................................................32
Gain and Integral time settings..................................................................................32
The P-gain reduction.................................................................................................32
Output Limitation.......................................................................................................32
Integral part Setting during the Control Mode Changing............................................33
Principle of Drooping................................................................................................33
Drooping Adjustment.................................................................................................33
SPEED_MONITOR function block .................................................................................33
Speed Actual Comparators .......................................................................................34
Overspeed limit .........................................................................................................34
Speed Measurement Fault ........................................................................................34
Stall Protection..........................................................................................................34
• Torque Reference ................................................................................................................37
TORQ_REF_SELECTION function block ......................................................................37
Torque Reference Scaling.........................................................................................37
Load sharing in Master / Follower Application ...........................................................37
Output Limitation.......................................................................................................37
TORQUE/CURRENT_LIMITATION function block ........................................................37
Current Limitations ....................................................................................................37
Torque Limits ............................................................................................................38
Speed Dependant Current Limitation ........................................................................38
Gear Backlash Compensation...................................................................................39
• Current Control ....................................................................................................................42
TORQ_REF_HANDLING function block ........................................................................42
Torque Reference Selection......................................................................................42
Torque Step ..............................................................................................................43
Output Limitation and its Indication ...........................................................................43
CURRENT_CONTROL function block ...........................................................................43
Torque / Current Reference Selection.......................................................................43
Current Response Test .............................................................................................43
Regulation Blocking ..................................................................................................43
Armature Current Scaling..........................................................................................43
Current Reference Rise Time....................................................................................43
Current Reference Limitation ....................................................................................43
ii DCS 500 Software Description