Dc Contactors With/Without Dynamic Braking - ABB DCS800 Firmware Manual

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For additional information
Macros: See the help screen in Drive Window Light by clicking on Help from any wizard
screen or in the following location on computers that have been loaded with DC drive tools:
C:\Program Files\DriveWare\DriveWindow Light 2\DCS800\DCS800HelpEnglish.chm
Note: DriveWindow Light "help" file does not yet include macro changes in rev 2.6 and 2.7.
Parameter Lists: See appendix A for a complete list of parameter settings for each macro.
DriveWindow Light: For basic instructions on DriveWindow Light (incl. communication
settings), see the DCS800 Quick Guide which is included with every D1 – D4 drive.

DC contactors with/without dynamic braking

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Overview
The type of DC contactor used in North America is not used worldwide. The US typically
uses DC contactors with 1 or 2 normally-open (NO) poles and sometimes 1 normally-
closed (NC) pole. The NO poles are used to make and break the connection between the
drive and the motor. Some contactors also have a NC pole used to connect a resistor
across the motor leads to make it stop (dynamic braking). The Europeans use a different
technique. In Europe, the dc contactor never breaks the circuit between the drive and the
motor. Instead, an AC input contactor is used. A single pole NO DC contactor is used for
dynamic braking. When dynamic braking is required, the AC contactor is opened,
removing power to the drive, and the DC contactor is closed, connecting the resistor across
the motor leads to make it stop. Then the DC contactor is opened again after the motor
stops. In revisions 1.7 and 1.8, only the European type was supported by the DCS800.
Revisions 2.1 and above also support the North American type. Revisions 2.2 and higher,
however, supports it differently with improved results.
DC Contactor Macros
Beginning in revision 2.6, the drive can automatically be configured to control a DC
contactor by enabling one of two new macros: "2-wire DC Contact US" or "3-wire DC
Contact US." These macros will not, however, configure the drive for dynamic braking.
This must be done manually. See below for instructions. See above for how to enable a
macro.
Contactor acknowledge input
When using the DCS800 to control the DC contactor, firmware 2.2 and above require that
an auxiliary contact from the DC contactor be connected to a drive input. This is the only
sure way for the drive to know that the contactor is closed and current can flow to the
motor. To configure this, set the following parameter:
•
MainContactorAck (10.21) = DI-1 (or whichever input is chosen)
IMPORTANT: This configuration is different than what was recommended for revision 2.1.
In 2.1, parameter 10.22 was used instead, and the input was inverted (using parameter
10.25 for example). This is not recommended for revisions 2.2 and above.
DCS800 Firmware manual supplement for North America (rev. 2.60, 2.70) Rev. b 5/30/2008