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Summary of Contents for Control Techniques Midi-Maestro
- Page 1 User Guide Midi-Maestro Maxi-Maestro Drives Variable Speed Drives for permanent-magnet DC servo-motors 1kW, 2kW and 5 kW Part Number: 0437–0503...
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Page 2: Table Of Contents
Mounted components The manufacturer accepts no liability for any consequences Making adjustments to resulting from inappropriate, negligent or incorrect the Midi-Maestro Drive installation or adjustment of the optional operating parameters of the equipment or from mismatching the Making adjustments to Drive with the motor. - Page 3 Declaration of Conformity Control Techniques PLC The Gro Newtown Powys SY16 3BE W. Drury Midi Maestro 140 x 8/16 Technical Director Midi Maestro 140 x 14/28 Newtown Maxi Maestro 25/50 Date: 7 April 1999 The above servo Drive products have been designed...
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Page 5: Features
Min value = 10 Ω Min value = 10 Ω Min value = 8 Ω = 40 A PEAK Armature feedback control range 150 ÷ 3000 Ambient temperature Operating temperature range: –10°C (50°F) to +50°C (122°F) Midi-Maestro and Maxi Maestro Drive... -
Page 6: Mechanical Installation
Through-panel mounting — from brackets to front of the Drive Through-panel mounting — from brackets to rear of the Drive Surface mounting — from brackets to front of the Drive Figure 2 Details of the mounting brackets Midi-Maestro and Maxi Maestro Drive... -
Page 7: Choke (Optional)
When a Maxi-Maestro Drive is used, or the internal figure quoted in the following table, a choke is braking resistor for a Midi-Maestro is insufficient, the required. Refer to Figure 3 for dimensions. Drive requires an external braking resistor. A braking resistor is supplied with the Maxi-Maestro Drive. -
Page 8: Ventilation
95°C, the Drive is disabled. When the temperature subsequently falls to below 95°C the Drive is automatically re-enabled. Figure 5 Locations of the signal and power connections in the Midi-Maestro Drive Midi-Maestro and Maxi Maestro Drive... -
Page 9: Power Connector
External braking resistor. EXT DBR (Maxi-Maestro only) External braking resistor. An additional braking resistor for the Midi-Maestro Drive is connected between pins 24 and 16. The braking resistor for the Maxi-Maestro is connected between pins 24 and 25. Figure 6... -
Page 10: Transformer Power Rating
The secondary windings must be delta-connected. (This is not essential for the primary winding.) Figure 7 Three-phase supply and ground Control Techniques Ltd is able to supply connections the appropriate transformers. Three-phase AC supply Single-phase AC supply 140 × 8/16 may be operated on a... -
Page 11: Dc Bus Voltage
Figure 9 Fuses in the transformer primary and secondary circuits Primary-circuit fuses Use the following equation to calculate the rating of the fuses in the primary circuit: Transformer VA rating Amps = RMS primary voltage Midi-Maestro and Maxi Maestro Drive... -
Page 12: Motor Connections
The cables should be kept as short as • possible (300mm is recommended). When a Midi-Maestro Drive is being used and the motor inductance is less than 2mH Terminal 3 of the choke should be connected to the + •... - Page 13 Figure 12 Typical ground connections Midi-Maestro and Maxi Maestro Drive...
- Page 14 Figure 13 Block diagram of the Drive Midi-Maestro and Maxi Maestro Drive...
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Page 15: Braking Resistor Connections
Earth (Ground) Ext Drive braking resistor Ext Drive braking resistor Power connector Ext Drive braking resistor Power connector Figure 15 Braking resistor connections for the Maxi-Maestro Drive Figure 14 Braking resistor connections for the Midi-Maestro Drive Midi-Maestro and Maxi Maestro Drive... -
Page 16: Signal Connections
Drive is STATUS enabled. STOP When 10V to 30V When the signal is discontinued, applied, the STOP function is the Drive is disabled (0V). enabled. This is a controlled STOP giving torque at zero speed. Midi-Maestro and Maxi Maestro Drive... -
Page 17: Setting Up The Drive
Disables speed control with tachogenerator feedback and enables the armature feedback function. Switch 3 Enables tacho loss protection. Disables tacho loss protection. Figure 16 Daughter board Switch 4 Disables acceleration and deceleration ramp. Enables acceleration and deceleration ramp. Midi-Maestro and Maxi Maestro Drive... -
Page 18: Mounted Components
Compensates for the voltage drop due to internal resistance of the motor. Enable the Drive and adjust the ZERO REF potentiometer to reduce the multimeter reading to not more than 1mV. Restore the original wiring. Midi-Maestro and Maxi Maestro Drive... - Page 19 × × × × RPM Vref Ke Vdt = 10,000 Where: = Maximum required speed Vref = Measured reference signal Ke = Tachogenerator voltage constant Midi-Maestro and Maxi Maestro Drive...
- Page 20 Max speed = Vm = 3 Motor voltage constant (at 1000 ), Ke = 15 RRT = = × × × × − − × × 183000 376980Ω Ω [( . 0 068 3 15 Midi-Maestro and Maxi Maestro Drive...
- Page 21 Connect oscilloscope ground to pin 8. kΩ Ω PEAK PEAK Connect the oscilloscope external trigger input to the function generator output. 15.0 Set the oscilloscope as follows: 12.0 Sensitivity: 1mV per division Timebase: 20ms per division Midi-Maestro and Maxi Maestro Drive...
- Page 22 Figure In this case, the system has insufficient derivative action. Turn potentiometer clockwise to DERIVATIVE eliminate the overshoot as shown in Figure 20. Midi-Maestro and Maxi Maestro Drive...
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Page 23: Making Adjustments To The Maxi-Maestro Drive
Connect a digital multimeter to pins 11 and 12. Vref = Measured reference signal Enable the Drive and adjust the ZERO REF Ke = Tachogenerator voltage constant potentiometer to reduce the multimeter reading to not more than 1mV. Restore the original wiring. Midi-Maestro and Maxi Maestro Drive... - Page 24 15A nominal current. × × 10,000 15 = = 7 500 Ω Ω RIN = × × 50 - 2 15 Where: 15 is the requested nominal current 50 is the theoretical peak current of the Drive Midi-Maestro and Maxi Maestro Drive...
- Page 25 Ω 400kΩ to 600kΩ. PEAK Caution 220.0 Too low a value for the resistor may modify the 120.0 velocity loop response. For guidance, contact Control 75.0 Techniques. 56.0 39.0 32.0 27.0 22.0 18.0 Midi-Maestro and Maxi Maestro Drive...
- Page 26 Connect oscilloscope ground to pin 8. Tachogenerator Connect the oscilloscope external trigger input to the function generator output. Set the oscilloscope as follows: Sensitivity: 1mV per division Timebase: 20ms per division Figure 22 Waveform resulting from insufficient proportional gain Midi-Maestro and Maxi Maestro Drive...
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Page 27: Commissioning
17 is positive. When this is Figure 24 Ideal waveform connected to the positive input of the motor, the motor turns clockwise as seen from the flange. To reverse the motor direction, reverse the motor and tachogenerator connections. Midi-Maestro and Maxi Maestro Drive... -
Page 28: Initial Start Up
Note that the motor at least one of the Drive protection functions is active. may turn extremely slowly. If the motor rotates in the reverse direction to the expected one, reverse the motor and tachogenerator connections. Midi-Maestro and Maxi Maestro Drive... -
Page 29: Outputs
Verify voltage level. No tachogenerator signal on pins 11 and 12 Switch-off / switch-on sequence too fast Check the tachogenerator and the tachogenerator Switch off the system for at least one minute before cables. re-applying power. Midi-Maestro and Maxi Maestro Drive... -
Page 30: Part Numbers
If the tachogenerator feedback mode has been selected, the resistors must be disconnected. RS resistor selected to improve STOP condition When a resistor is fitted, the dynamic response is modified. If this resistor is not required, disconnect it. Midi-Maestro and Maxi Maestro Drive... -
Page 31: Alternative Daughter Boards
Enables speed control with tachogenerator feedback. Enables acceleration and deceleration ramp. When used in this position remove RAI resistor. Disables speed control with tachogenerator feedback. Switch 4 Disables acceleration and deceleration ramp. Enables acceleration and deceleration ramp. Midi-Maestro and Maxi Maestro Drive... - Page 32 Midi-Maestro and Maxi Maestro Drive...
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