ABB ACS 600 MultiDrive, User Manual

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Chapter 6 – Firmware Description
ACA 635 IGBT Supply Sections 6-9
Level Start Level Start is used with parallel connected DSU and ISU
configurations. Level Start is enabled by Parameter 21.01 LEVEL
START selection YES. In Level Start mode the ISU starts modulating
after the DC link voltage exceeds a preset limit and modulates only
when power flows from DC link to network. The DC voltage level to
trigger the modulator is set by Parameter 21.02
DC VOLTAGE LEVEL.
When motoring power (positive direction from network to the DC link)
exceeds Parameter 21.04 STOP LEVEL POWER for a time set by
Parameter 21.03 STOP LEVEL TIME, the modulator is stopped.
Parameter 21.04 STOP LEVEL POWER is always positive because
stopping the ISU during braking is not desirable.
Parameters affecting Level Start mode are listed below.
Stop A stop signal from the on/off switch on the cabinet door is disabling the
modulator and opening the main contactor. The modulator can be
stopped also from the
key on the Control Panel and from
Drive Window in local mode, and from an overriding system in remote
mode. These functions do not open the main contactor.
When the modulator is stopped in local mode or by an overriding
system, the ISU moves to 6-pulse diode bridge mode. The nominal
references, Parameters 2.07 DC REF INITIALIZ and 150.01 FLUX
REF USED NOM, are updated, if Parameter 124.04 STOP INIT
DENIED is set to FALSE.
Stop parameters are listed below.
Code Parameter Unit Description
21.01 DC LEVEL START Enables level start
21.02 DC VOLTAGE LEVEL V High level start condition
21.03 STOP LEVEL TIME s Stop condition time
21.04 STOP LEVEL POWER kW Stop condition power
Code Enable Parameter Unit Description
124.04 STOP INIT DENIED Denies update of nominal DC
reference when set to TRUE.
Output Parameters
2.07 150.02 DC REF INITIALIZ V Nominal DC voltage reference
150.01 FLUX REF USED NOM % Nominal flux reference