Manual SCA-SS V /02 page 1

Transcription

1 Manual SCA-SS V /02 page 1 SCA-SS (30V, 6A) The servo amplifier SCA-SS is a powerful servo amplifier for brushed DC motors with an output range up to 150 Watt. These operation modes are integrated Current control I x R control DC-Tacho control Voltage control Optional: encoder feedback The required operation mode is to be selected with jumpers, which are accessible externally at any time. This SCA-SS servo amplifier is protected against over current and overheat. Due to the wide range of power supply voltage between 11 to 30 V DC the SCA- SS can be used very flexible with different kinds of power supplies. The robust aluminium case has been constructed for different methods of mounting it, therefore a fast and easy integration is provided. Screw terminals and a durable controller-design allow a fast and straightforward commissioning. Contents 1. Safety notes Specification Description of inputs and outputs Configuration Operating modes Connection of inputs and outputs Commissioning Troubleshooting Dimensions Versions of Text Safety notes 1.1. Skilled personnel The installation and commissioning have to be done only by skilled personnel Laws The user has to ensure the correct installation of the servo amplifier and additional equipment according to valid laws and rules Remove load For first commissioning the motor should run with free shaft which means without load Additional safety components Electronic components are not free of failure or damage. Therefore plants have to be installed with additional device and installation protecting components. A safe and stable state has to be ensured in the case of damage of some devices, wrong handling, cable disruption and other cases of any kind of malfunction.

2 Manual SCA-SS V /02 page Repairs Repairs have to be done only by authorized distributors or at the manufacturer. Unauthorized opening and improper repairs of the device may cause danger to the user and the plant Danger Care about having no power supply voltage all around the plant during installation of the device! Never touch any voltage-carrying components! 1.7. Maximum input voltage The input power supply voltage must not exceed 30 V DC. Voltages exceeding 30 V or reversed connection will destroy the unit ESD Do not touch any of the contacts of the device EMC The SCA-SS corresponds to the EC directives,standards and regulations 89/336/EWG article 10 and appendix 1 (EMV) amended by 92/31/EWG and 93/68/EWG and meet the requirements with standard EN (1996) if the following directions are observed: usage of a zinc plated mounting plate, well connected to earth mounting of the drive by usage of toothed washers usage of shielded cables to and from the unit large area contact of the shielding with zinc plated mounting plate. motor housing properly connected to earth Special requirements have to be considered by the user. 2. Specification 2.1. Electrical Power supply voltage V DC data Nominal output current 3 A 2.2. Inputs Set value V Tacho Max 50 VDC (50kOhm) Enable 8-30 V high active 2.3. Outputs Supervision output Error Open Collector max. 30 V DC Auxiliary voltage output +/- reference +/- 3,9 V/max. 20mA 2.4. Display 2-colour LED green: ready/enabled, red: error/disabled 2.5. Weight With terminal connector 330 g 2.6. Dimensions (DxWxH) 100 x 117 x 40 mm 2.7. Temperaturerange Operation o C Storage o C 2.8. Humidity range Non condensing 20% - 80% rel. hum.

3 Manual SCA-SS V /02 page 3 3. Description of inputs and outputs In brackets () the number of connector 3.1. Inputs Set value (7), (8) The set value input is connected to an differential amplifier. Input voltage range: - 10 V V Input impedance: 100 kohm Definition of polarity: positive set value (+ Set value) > (- Set value) negative set value (+ Set value) <(- Set value) Input connection set value: Soll Gnd 100k 47k +SetValue 100k 47k GNDA Enable (14) High potential at the input enable will activate speed/torque control and voltage will be applied to the motor winding. Leaving this input open or pulling it to GND-potential will result in disabling the unit Input connection Enable: Enable In 2k2 2k2 1n 4k7

4 Manual SCA-SS V /02 page Tacho (5) Tacho (6) For operating mode tacho control an analog tacho has to be connected to these inputs. Input impedance: 50 kohm Maximum input voltage: 50 V Important: at cw turning of motorshaft the potential of the signal + Tacho has to be higher than the potential of - Tacho to close the control loop. Input connection tacho: +Tacho 1k 33k 100k 50k -Tacho 33k 4k7 100k GNDA Vcc (3) Power GND (4) Power supply connector. Caution: DO NOT connect + Vcc and Power GND to the outputs + Motor or - Motor Outputs Auxiliary voltage output Enable + V (13) The auxiliary voltage output Enable + V provides a low-resistant connection to pin + Vcc (3). +Vcc 1k Enable +V supervising report Error Out (11) The error-signal is to show the status of the drive and can be used to provide a feedback signal to other devices and controls. The open-collector is normally turned off which means the output is pulled to a positive level by the means of an external resistor. In the case of a fault the output is pulled to GND. Input voltage range: max. 30 V DC Load current: < 20 ma Output connection Error:

5 Manual SCA-SS V /02 page Auxiliary voltage outputs + Reference (9), - Reference (10) The auxiliary voltage outputs + reference and - reference provide a voltage of +/- 3,9 V in reference to analog GND. Analog GND is on half the level of the power supply voltage. Therefore there is no direct connection to Power GND or GND Signal. These auxiliary voltage outputs are for connection with an external potentiometer and must not be connected to any other pin or for any other purpose. Input connection reference voltage generator: +Ref 100R 33k -Ref 100R 33k GNDA Motor (1) Motor (2) Outputs for motor connection. 4. Configuration For correct function please consider the required setting of Operation mode Input for Set Value and place the according jumpers at the front side of the drive Selection of Operating modes (Jumper 1-4) Operating modes I x R Voltage Control Torque Control Tacho Jumper J1, J2, J4 J1, J2 J3 J1

6 Manual SCA-SS V /02 page Selection of Input for Set Value (Jumper 5 6) Via Offset Pot J5, J6 Via Ext. Pot J5 Via Set Value Operating modes 5.1. Minimum wiring I x R Voltage Control Torque Control 5.2. Minimum wiring Tacho

7 Manual SCA-SS V /02 page 7 6. Connection of inputs and outputs 6.1. Connection Enable-Input The enable input can be switched on by the means of an external ground based voltage (high active) Enable In Enable +V Gnd Signal 12 +8V...+30V or by the means of the auxiliary voltage output enable + V (13) and a potential free switch (no). Enable In Enable +V Input for Set Value The set value for speed (Operating modes I x R, Voltage Control, Tacho) respectively motor current (Operating mode Control) can be set on three different ways Input for set value by the means of external potentiometer -Reference +Reference Set value 87 +Set value In this case the pin (8) must not be connected Input for set value by the means of an analog voltage reference -Set value +Set value V...+10V Input for set value by the means of the integrated potentiometer for offset adjustment In this case the pins (7) - (10) must not be connected Wiring output error out Error Out 11 max. 30V Last Load

8 Manual SCA-SS V /02 page 8 7. Commissioning 7.1. Selection of power supply Any power supply can be used as long the minimal requirements listed below are fulfilled. We recommend to remove the motor from the mechanical construction to avoid damage and danger by uncontrolled movements. Requirements to the power supply: Output voltage: min. 11 V DC max. 30 V DC Residual voltage: < 5 % Output current: 6 A nominal Function of the potentiometers Potentiometer Function Turning ccw Turning cw Gain Gain adjustment Decreasing Increasing N max Maximum speed at set value of Decreasing speed Increasing speed 10 V I max Current limitation Decreasing min. 0 A Increasing max. 6 A I x R I x R compensation low compensation High compensation Offset adjustment n=0 at set value= 0 Motor turns cw Motor turns ccw 7.3. Presetting of potentiometers Original delivered servo amplifiers are adjusted to uncritical values and for easy adjustment by the user Adjustment I x R-control DC-Tacho control Digital-Encoder control Torque control 1. Adjust max. set value (e.g. 10 V) and turn potentiometer n max cw til the required speed is reached 2. Adjust potentiometer Imax to required value of current limitation. Important: Refer to motor manufacturers data sheet 3. Turn potentiometer Gain slowly cw until the required gain is reached Important: If the motor turns rough, is vibrating or makes noise turn potentiometer ccw again, until the instability of the system is obsolete. 4. Adjust set value = 0 V and adjust potentiometer Offset until the motor stops to speed Additionally only at I x R compensation: increase slowly Poti I x R, until the value of the feedback is high enough to control the drive to get best results concerning motor speed at different loads 1. Adjust potentiometer Imax to required value of current limitation. Important:: Refer to motor manufacturers data sheet 7.5. Commissioning Select the required operating mode by setting the according jumpers on the left side of the unit. Refer to the printing on the front plate. Required selection of: operating mode Input for set value Connect motor, control inputs e.g. set value, enable and if necessary an additional encoder or tacho to the drive. Connect power supply. Enabling and adjustment referring to manual.

9 Manual SCA-SS V /02 page 9 8. Troubleshooting Symptom Operating mode Causes Repair Motor All Power supply voltage < 11 V Check power supply does not Enable not active Check level at pin 14 turn Set value 0 V Check set value Current limitation adjusted too low Check potentiometer adjustment I max Speed range too low Check potentiometer adjustment n max Wrong operation mode Check jumper setting Bad connections Check connectors Wrong wiring Check wiring No speed Encoder mode Encoder signals Check signals and sequence control Tacho mode Tacho signals Check voltage and polarity I x R Feedback too low Check adjustment of potentiometer Gain and I x R 9. Dimensions x 4,5 1,5 3, Versions of Text V 0.9 (09/02) preliminary issue with revision of set value with ext. pot