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Using DC contactors with or without dynamic braking

Use digital output 8 (DO-8) to control the DC contactor. DO-8 is the only relay output in the

DCS800 drive and is rated at 3 Amps at either 115/230 Vac or 24 Vdc. (Rated at 0.3 Amps

at 115-230 Vdc.) Control of DO-8 is configured with parameters DO8Index (14.15) and

DO8BitNo (14.16).

Parameter DO8Index (14.15) is used to select the control word;

Parameter DO8BitNo (14.16) is used to select which bit in that word is the switch;

The default setting for DO8Index (14.15) is 603, which refers to CurCtrlStat1 (6.03). Three

bits can be used to control the various types of contactors:

MainContactorOn

DynamicBrakingOn

US-DynamicBrakingOn

For all types of DC contactors that break the circuit between the drive and the motor, set

the parameters as follows:

•

Parameter DO8Index

•

Parameter DO8BitNo

For revision 2.2 and above, the following parameter must also be set:

•

MainContCtrlMode

Configuring the drive for dynamic braking

The drive allows you to select the stopping method under three different situations.

Parameters 21.02, 21.03 and 21.04 select the stopping method for loss of the OnOff, run

command (StartStop, Jog1, Jog2, etc.), and E-Stop input, respectively. Each can be set to:

•

RampStop

•

CoastStop

In order to command the drive to perform a DB stop, one or more of these parameters must

be set to DynBraking. Most users will want the drive to ramp stop when OnOff or a run

command (StartStop, Jog1, Jog2, etc.) input is cleared, and dynamically brake when the E-

Stop input is cleared. In that case, use the following settings:

•

Parameter Off1Mode

•

Parameter StopMode

•

Parameter E StopMode (21.04)

However, any case is allowed and the final decision is left to the user.

NOTE: Stopping by way of OnOff takes precedence over stopping by way of StartStop (or

Jog1 or Jog2). For example, assume:

Off1Mode (21.02) is set to DynBraking, and

StopMode (21.03) is set to RampStop

If StartStop is cleared, then the drive will begin to ramp stop. If OnOff is then cleared

before the motor comes to a stop, then the motor will dynamically brake the rest of the way.

Other parameters control the stopping method during certain fault conditions. See:

•

LocalLossCtrl (30.27)

•

FaultStopMode (30.30)

DCS800 Firmware manual supplement for North America (rev. 2.60, 2.70) Rev. b

(default – for AC contactors)

(for European 1-pole DB contactors)

(for North American DC contactors)

(14.15)

= 603 (default)

(14.16)

= 10

(21.16)

= DCcontact (3)

•

(21.02)

= RampStop

(21.03)

= RampStop

= DynBraking

•

TorqueLimit

DynBraking

ComLossCtrl (30.28)

SpeedFbFltMode (30.36)

5/30/2008