User Manual SCA-SS-70-10 4–Q PWM Servo – 10 A For Brush-Commutated DC Motors up to 700 W SCA-SS-70-10 • Servo amplifier in a rugged aluminium housing • Different methods of mounting for fast installation • Inputs and outputs via screw terminals • Operation mode setting with jumpers • User adjustable current limit • Wide range supply voltage between +11 and +70 VDC for different kinds of DCpower supplies • Protected against overtemperature and over-current • MOSFet-technology, efficiency 95% • Continuous
User Manual SCA-SS-70-10 Table of Contents 1. Safety & Installation .................................................................... 3 2. Specifications: ............................................................................. 4 3. Drive Overview ............................................................................ 6 4. Wiring ......................................................................................... 10 5. Explanation of Terminals, Dip Switches, & Potentiometers..
User Manual SCA-SS-70-10 1. Safety & Installation The SCA-SS-70-10 requires installation by qualified personal which must pay attention to significant safety and other regulatory standards. They should be thoroughly familiar with the entire system before beginning installation. Before final operation of machine be sure to test hookup with motor but disconnected from the load.
User Manual SCA-SS-70-10 2. 2.1 Specifications: Electrical Data Power Supply Voltage +11 to +70 VDC (Residual ripple <5 %) (The lower limit is monitored integrated undervoltage trip) by WARNING: Do not exceed 70V. Overvoltage will damage the drive. Nominal Current 10 A Peak Current 20 A Maximum Power (only achievable with additional heatsink & proper mounting, see accessories.
User Manual SCA-SS-70-10 2.2 Mechanical Data Mechanical Dimensions L x W x H 180 x 100 x 40 mm Weight 740 g Mounting 2.3 2.4 M3 screws or Din Rail Mounting Ambient Conditions Operation Temperature -10 to +45 oC Storage Temperature -40 to +85 oC Humidity (Non Condensing) 20 % to 80 % RH Overtemperature Protection +80 °C Digital and Analog Inputs Enable 8…+30 VDC; Resistance = 4,7 kOhm Encoder A, B TTL, +5 VDC; Resistance = 1 kOhm; max.
User Manual SCA-SS-70-10 3. Drive Overview 3.1 Block Diagram ElectroCraft® E-Mail: info@electrocraft.com 6 www.electrocraft.
User Manual SCA-SS-70-10 3.2 Input & Output Schematics ElectroCraft® E-Mail: info@electrocraft.com 7 www.electrocraft.
User Manual SCA-SS-70-10 3.3 Control Elements 3.4 Operation Modes Voltage Mode In the voltage mode the drive is watching the output voltage as a feedback voltage. The drive can not regulate the speed exactly if the motor is loaded with a higher load. This mode is used e.g. in conveyors with nearly constant load to control the speed. Tacho Mode In the tacho mode the feedback information is coming as a voltage signal from a tacho mounted at the motor.
User Manual SCA-SS-70-10 Torque Mode In the torque mode the drive does only control the current in the motor. This control loop is very fast but the speed is moving with the load due to the constant current. This mode is used in application with force control or as a fast power amplifier for position systems. Encoder Mode At encoder mode feedback information is coming from the encoder signals. The encoder is mounted at the motor.
User Manual SCA-SS-70-10 4. Wiring According to the safety directives, a correct cable selection is mandatory. Regular inspection is advisable. Damaged, burned or kinked items have immediately to be exchanged. Power (⊕Vcc - Power GND) • Normally no shielding required. • When connecting several amplifiers to the same supply pack, use star point wiring. Motor Wiring (> 30 cm) • Only shielded cables are recommended. • Connect the shield to the ground lug of the servo amplifier.
User Manual SCA-SS-70-10 4.1 Wiring Example I – Voltage Mode ElectroCraft® E-Mail: info@electrocraft.com 11 www.electrocraft.
User Manual SCA-SS-70-10 4.1.1 Setting of the Jumpers Mode Voltage Control Current 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.1.2 Adjustment procedure for Voltage mode 1. Potentiometer pre setting refer chapter 5.2. 2. Choose the maximum set value (e.g. 10 V). Turn the potentiometer n max, until the desired maximum speed is reached with unloaded motor. 3.
User Manual SCA-SS-70-10 4.2 Wiring Example II – IxR Comp Mode ElectroCraft® E-Mail: info@electrocraft.com 13 www.electrocraft.
User Manual SCA-SS-70-10 4.2.1 Setting of the Jumpers Mode IxR Control Current 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.2.2 Adjustment procedure for IxR mode 1. Potentiometer pre setting refer chapter 5.2. 2. Choose the maximum set value (e.g. 10 V). Turn the potentiometer n max, until the desired maximum speed is reached with unloaded motor. 3.
User Manual SCA-SS-70-10 4.3 Wiring Example III – Torque Mode ElectroCraft® E-Mail: info@electrocraft.com 15 www.electrocraft.
User Manual SCA-SS-70-10 4.3.1 Setting of the Jumpers Mode Torque Control Current 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.3.2 Adjustment procedure for Torque mode 1. Potentiometer pre setting refer chapter 5.2. 2. Adjust the current limiter to a value requested by you with the I max potentiometer.
User Manual SCA-SS-70-10 4.4 Wiring Example IV – Tacho Mode ElectroCraft® E-Mail: info@electrocraft.com 17 www.electrocraft.
User Manual SCA-SS-70-10 4.4.1 Setting of the Jumpers Mode Tacho Control Current 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.4.2. Adjustment procedure for Tacho mode 1. Potentiometer pre setting refer chapter 5.2. 2. Choose the maximum set value (e.g. 10 V). Turn the potentiometer n max, until the desired maximum speed is reached with unloaded motor. 3.
User Manual SCA-SS-70-10 4.5 Wiring Example V – Encoder Mode ElectroCraft® E-Mail: info@electrocraft.com 19 www.electrocraft.
User Manual SCA-SS-70-10 4.5.1 Setting of the Jumpers Mode Current Encoder Control 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.5.2. Adjustment procedure for Encoder mode 1. Potentiometer pre setting refer chapter 5.2. 2. Choose the maximum set value (e.g. 10 V). Turn the potentiometer n max, until the desired maximum speed is reached with unloaded motor. 3.
User Manual SCA-SS-70-10 4.6 Wiring Example VI – Analog Position Mode ElectroCraft® E-Mail: info@electrocraft.com 21 www.electrocraft.
User Manual SCA-SS-70-10 4.6.1 Setting of the Jumpers Mode Analog Position Current 0 – 10 A 0–5A Set Value via 3–7A 5 – 10 A Offset pot Connector Note: Advanced information’s about the jumpers refer chapter 5.3. 4.6.2 Adjustment procedure for Analog Position mode 1. Potentiometer pre setting refer chapter 5.2. 2. Choose the maximum set value (e.g. 10 V). Turn the potentiometer n max, until the desired moving angle is reached with unloaded motor. 3.
User Manual SCA-SS-70-10 4.7 Wiring Example VII – Minimal Mode ElectroCraft® E-Mail: info@electrocraft.com 23 www.electrocraft.
User Manual SCA-SS-70-10 4.8 Wiring Example VIII ElectroCraft® E-Mail: info@electrocraft.com 24 www.electrocraft.
User Manual SCA-SS-70-10 5. Explanation of Terminals, Dip Switches, & Potentiometers 5.1 Terminals Terminal Label Description Pin 1 & 2 connect to power supply. XA Pin 3 & 4 connect to motor. Pin 5 voltage output +5 VDC. Pin 6 & 7 input encoder feedback. Pin 8 signal GND. Pin 9 output signal Ready. XB Pin 10 output signal Error. Pin 11 signal GND. Pin 12 input for Disable Fwd. Pin 13 input for Disable Rev. Pin 14 input Enable. Pin 15 voltage output +15 VDC. Pin 16 signal GND.
User Manual SCA-SS-70-10 5.2 Potentiometers Potentiometer Function Turning to the Left (ccw) Turning to the Right (cw) Gain Factor lowered Factor raised n max Definition of max. number of revolutions Value is decreased Value is increased I max Set value for max.
User Manual SCA-SS-70-10 5.
User Manual SCA-SS-70-10 6. Glossary Offset There are two distinct functions for the Offset-Potentiometer: 1. Levelling the position at which the motor stands still. 2. Selection of the Set Value. This task requires setting jumper J4 and opening jumper J5. In any mode, this feature is available and offers the possibility of a quick functional test. It is advisable to begin the subsequent levelling procedure with an idle run of the motor.
User Manual SCA-SS-70-10 IxR This potentiometer is helpful to stabilize the speed in a certain range after a change of the load. First detect the number of revolutions at the lower level, then raise the load and adapt the speed using the IxR potentiometer. An optimum precision of the compensation however is not realistic, because the behaviour of the motor after a load change is only predictable in a certain tolerance.
User Manual SCA-SS-70-10 Tacho Mode In the tacho mode the feedback information is coming as a voltage signal from a tacho mounted at the motor. Torque mode In this mode the driver controls only the current into the motor. The speed of the motor depends on the load because only the output force of the motor is regulated. Voltage Mode In the voltage mode the drive is watching the output voltage as a feedback voltage.
User Manual SCA-SS-70-10 Closed loop This is broadly applied term, relating to any system in which the output is measured and compared to the input. The output is then adjusted to reach the desired condition. In motion control, the term typically describes a system utilizing a velocity and/or position transducer to generate correction signals in relation to desired parameters. Cogging A term used to describe non-uniform angular velocity. Cogging appears as jerkiness, especially at low speeds.
User Manual SCA-SS-70-10 Driver Is the electronics which convert step and direction inputs to high power currents and voltages to drive a step motor. The step motor driver is analogous to the servomotor amplifier's logic. Encoder Is a feedback device which converts mechanical motion into electronic signals. The most commonly used, rotary encoders, output digital pulses corresponding to incremental angular motion. For example, a 1000-line encoder produces 1000 pulses every mechanical revolution.
User Manual SCA-SS-70-10 Open-loop A system in which there is no feedback. Motor motion is expected to faithfully follow the input command. Stepping motor systems are an example of open-loop control. Pulse Width Modulation (PWM) 1. A PWM controller (amplifier) switches DC supply voltage on and off at fixed frequencies. The length of the on/off interval or voltage waveform is variable. 2.
User Manual SCA-SS-70-10 Thermal protection A thermal sensing device mounted to the motor to protect it from overheating. This is accomplished by disconnecting the motor phases from the drive in an over temperature condition. Torque Is a measure of angular force which produces rotational motion. This force is defined by a linear force multiplied by a radius; e.g. lb-in or Nm. Torque is an important parameter of any motion control system.
User Manual SCA-SS-70-10 7. 7.1 Description of Inputs and Outputs Digital Inputs Enable: Activating or Disabling the Output Stage If the Enable input is at GND potential or not wired at all, the output stage remains in the locked state. The motor stands still or slow down without brake. To reactivate the output stage, a voltage signal >8 V to the Enable input XB/14 is necessary. Additional information about the schematic refer chapter 3.2. Range of Input Voltage 0 to +30 VDC Input Impedance 4.
User Manual SCA-SS-70-10 Disable Rev: Activating or Disabling one Direction of Rotation If the Disable Fwd input is at GND potential or not wired at all, the motor works only in one direction e.g. counter clockwise. To activate this direction, a voltage signal >8 V to the Enable input XB/13 is necessary. Additional information about the schematic refer chapter 3.2. Range of Input Voltage 0 to +30 VDC Input Impedance 4.
User Manual SCA-SS-70-10 7.2 Digital Outputs Error: Monitoring Output Whenever a system failure occurs (i.e. overtemperature), the Error output responds (LO position), and the green LED on the front panel is switch to red. The drive output stage is switched off and the error will not reset until the user resets the drive by switching the enable input. If the error occurs again the problem still exists.
User Manual SCA-SS-70-10 7.3 Analog Inputs +Set value –Set value: Inputs for Set Values An external +10/-10 V analog signal for speed or for current is entered using +Set value and –Set value inputs. If the effective voltage is 0V, the motor stops. If the effective voltage is positive, the motor moves in one direction. If the input is negative, the motor consequently will be move in the opposite direction.
User Manual SCA-SS-70-10 +Tacho –Tacho: Analog Tachometer Feed Back The +Tacho –Tacho inputs transmit an analog set value for the number of revolutions from a tachometer coupled to the motor, back to the servo amplifier. This feature improves the accuracy of speed control, stable even in cases of a large load change. The input is given in form of a differential amplifier without ground connection. Additional information about the schematic refer chapter 3.2.
User Manual SCA-SS-70-10 8. Basic Troubleshooting The servo amplifier has included some different protective functions. Under voltage and over temperature are monitored and shown with the LED’s at the front side. Important: The motor starts only by resetting the Enable. Before resetting an error by resetting the Enable make sure that the cause of the failure is eliminated. Motor oscillates • The gain of the servo amplifier is too high. Reduce the gain pot or in IxR mode the the IxR pot.
User Manual SCA-SS-70-10 No motion even though enable is on • Check power supply and the wiring. • Overheating protection is active. Overtemperature • Use an additional heatsink (see accessories). • Reset the amplifier. Note: Beware that the maximal working temperature of 80°C in the driver is not reached; otherwise the drive will be switched off. 9.
User Manual SCA-SS-70-10 10. Warranties & Disclaimers • Contents are subject to change without notice. • Electrocraft will not be liable in any way for direct, indirect, incidental, or consequential damages caused by the use of this product or document. • Per Electrocraft’s Terms & Conditions, the user of Electrocraft’s accepts all responsibility and risks involved with applying this product into their machinery and indemnifies Electrocraft against all damages.
User Manual SCA-SS-70-10 ca. 180 20,0 69,5 140,0 149,5 11. Dimensions 90 ElectroCraft® E-Mail: info@electrocraft.com 43 www.electrocraft.
User Manual SCA-SS-70-10 100 40 3,0 1,5 82 All dimensions in mm. 12. Mounting Din rail adapter 4 x M4x6 SCA-SS-70-10_E09 Subject to change without prior notice. ElectroCraft® E-Mail: info@electrocraft.com 44 www.electrocraft.
