MDC Manual 1109KB - Red Lion Controls

More documents

Recommendations

Info

BLOCK DIAGRAM -6-
THEORY OF OPERATION In Master Mode, the MDC uses actual motor speed (Feedback Input) and an analog control voltage (Drive Output) to precisely control the motor’s speed. The MDC operates on a 10 msec control cycle. Actual motor speed is read and drive output is corrected every 10 msec. The Drive Output voltage is generated by a 12 bit DAC (digital to analog converter). Motor speed is controlled by adjusting the Output Value (in bits) to the DAC. The Output Value (0 to 4095 bits) is made up of two parts, the Open Loop term, and the correction term or Trim Value. The Open Loop term is the ratio of the Reference Speed to Maximum Speed multiplied by 4095. This is the uncorrected “Feed Forward” part of the Output Value. The Reference Speed is the current Speed setpoint taking into account any acceleration or deceleration which may be in progress. The Maximum Speed is Max RPM Feedback which is set when scaling the unit. (See the Program Scaling section of the manual for more information.) The correction term or Trim Value is derived from actual motor speed (Feedback Input) and the Reference Speed. The Trim Value is added to the Open Loop term when the MDC is running Closed Loop to provide precise control. The Error Gain determines the rate at which the Trim Value changes in response to a motor loading or a sudden speed change. The Trim Value is updated every 10 msec. It may be viewed as one of the programmable display options (see Program Displays Menu). The Drive Output voltage is then the ratio of Output Value (in bits) to 4095 multiplied by the Full Scale Reference voltage. The internal Full Scale Reference is factory calibrated to 10 VDC but may be adjusted to any value within a5to15VDCrange. An external reference option also exists. (See Isolated Drive Output section of manual for more information.) In Follower Mode, the basic operation is the same except that the Reference Speed is generated as a ratio to the Lead Input speed. Also, the MDC operates on a 20 msec control cycle in order to process both Lead and Feedback input frequencies. -7-
Page 1 and 2: THE MOTOR DRIVE CONTROLLER MODEL MD
Page 3 and 4: TABLE OF CONTENTS I. GENERAL DESCRI
Page 5 and 6: TABLE OF CONTENTS (Cont’d) IV. PR
Page 7: QUICK START - SETTING UP THE MDC Wh
Page 11 and 12: KEYPAD DESCRIPTION Shown here is a
Page 13 and 14: OVERFLOW INDICATION An input freque
Page 15 and 16: USER SETPOINTS MODULE The User Setp
Page 17 and 18: USER SETPOINTS IN FOLLOWER MODE The
Page 19 and 20: PROGRAM SCALING MENU The Program Sc
Page 21 and 22: PROGRAM USER MENU There are four ex
Page 23 and 24: SETPOINT INCREMENT (INC SPT) Only a
Page 25 and 26: Phase The positive (+) phase of an
Page 27 and 28: -25-
Page 29 and 30: USER SETTINGS This Menu should only
Page 31 and 32: PROGRAM DIAGNOSTICS MENU This Menu
Page 33 and 34: INSTALLATION & CONNECTIONS Installa
Page 35 and 36: WIRING CONNECTIONS When wiring the
Page 37 and 38: DEDICATED FUNCTION AND USER INPUTS
Page 39 and 40: VARIOUS SENSOR OUTPUT CONNECTIONS (
Page 41 and 42: ISOLATED DRIVE OUTPUT CALIBRATION N
Page 43 and 44: 11. CONTROL INPUTS: Internal 10 K
Page 45 and 46: TROUBLESHOOTING GUIDE (Cont’d) PR
Page 47 and 48: APPENDIX “A” APPLICATIONS -45-
Page 49 and 50: APPENDIX “B” - ORDERING INFORMA
Page 51: Red Lion Controls 20 Willow Springs

MDC Manual 1109KB - Red Lion Controls

Create successful ePaper yourself

Delete template?

Save as template?