ABB DCS800-EP2-0140-05 Instrukcja oprogramowania sprzętowego - Strona 10
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10
EMF feedback with dynamic braking
If using EMF feedback with dynamic braking (meaning parameter M1SpeedFbSel (50.03) is
set to EMF and one or more of the above parameters is set to DynBraking), you will also
need to set up the DynBrakeDly (50.11) parameter. This is necessary, because, when
using a DC contactor with EMF feedback, when the contactor opens to dynamically brake,
there is no valid information about the motor speed and thus no zero speed information in
the drive. To prevent an interlocking of the drive after dynamic braking, the speed is
assumed to be zero after DynBrakeDly (50.11) time is elapsed. When dynamically braking,
the zero speed output will be set after this time expires.
The following parameter must be set:
•
Parameter DynBrakeDly
For additional information
See the DCS800 firmware manual:
•
Page 120
•
Page 168
•
Pages 180 – 181
•
Pages 205 - 207
AC contactors
_________________________________________________________
The drive's DO-8 output can control an AC input contactor instead. For an AC contactor,
use these settings:
•
Parameter DO8Index
•
Parameter DO8BitNo
•
Parameter MainContCtrlMode
•
Parameter MainContAck
*As an alternative to using parameter (10.21), the contactor acknowledge signal (from an
auxiliary contact on the AC input contactor) can be used to set the "StartStop" input. This
would permit the motor to be turned on and commanded to move by setting just one input,
the OnOff input. When OnOff is set, the drive will set DO-8 which will close the AC
contactor. The auxiliary contact will then give the StartStop input, initiating motion. If this is
desired, use the following parameter instead of 10.21:
•
Parameter StartStop
DCS800 Firmware manual supplement for North America (rev. 2.60, 2.70) Rev. b
(50.11)
= the time (seconds) it normally takes the
motor to stop during dynamic braking
group 6 parameters
group 14 parameters
group 21 parameters
group 30 parameters
(14.15)
= 603 (default)
(14.16)
= 7 (default)
(21.16)
= On (default)
(10.21)
= the acknowledge input number, if
present.*
(10.16)
= the acknowledge input number
Drive Logic Signals
Digital Outputs
Start / Stop
Fault Functions
5/30/2008