RC-050 Applied Motion

404 Westridge Dr. Watsonville, CA 95076 831/761-6555 800/525-1609 FAX 831/761-6544 www.appliedmotionproducts.com RC-050 Regeneration Clamp Features Description The RC-050 is mounted on a heat sink and has a As with most servo systems a clamp circuit is required to 50 watt power resistor for more continuous current limit increase power supply buss voltage when the motor handling. is decelerating under load. This is commonly referred to as Size: regeneration which is what happens when DC motors are RC-050 is 3 x 4 x 2.25 tall. driven by their load. During regeneration the DC motor can Voltage Range: produce enough voltage to actually exceed the input power 24 to 80 VDC, no user adjustments. supply voltage. More sophisticated servo amplifiers deal Peak Power: with this by channeling the increased motor voltage back RC-050 800 Watts. to the source power supply. If the voltage is not clamped Continuous Power: to a safe level the amplifier can be damaged or destroyed. RC-050 50 Watts. The SV7 servo amplifier/controllers are types that channel Connection: the increasing voltage back to the input power supply. In 6 pin screw terminal block accepts 12 18 guage some cases this can be handled by placing a significant wire. size capacitor at the input to absorb the voltage impulse. Indicators: However, this is often not enough especially in cases where A green led indicates power supply voltage is pres- a large inertial mass is being decelerated. ent. A red led indicates when the clamp is operating. This is typically a very short time since it is only on For this reason Applied Motion Products offers a Regen when the servo is decelerating. Clamp module for our servo drive products. With this Protection: module one or more servo drives can be protected from The power supply is internally connected to an In- Over Voltage conditions by placing the clamp module be- put Diode that protects it from the higher regenera- tween the power supply and the drive. The clamp tracks the tion voltages. The diode protects the system from input power supply and will operate from 24 to 80 volts. No connecting the power supply in reverse. If the clamp adjustments are needed. circuit were to fail the diode will continue to protect The Regen Clamp is designed to handle a wide range of the power supply from over-voltage. conditions. The voltage input matches the needs of the AMP servo drives by providing 24 to 80 VDC capabilities. The clamps come in different versions for moderate to high power operation. External power resistors can be added for even greater continuous power requirements. The modules are small and compact to minimize impact on the system design. More than one servo drive can be connected to the clamp module with the potential to handle an entire multi- axis sytem. 920-0024B Regeneration Clamp404 Westridge Dr. Watsonville, CA 95076 831/761-6555 800/525-1609 FAX 831/761-6544 www.appliedmotionproducts.com RC-050 Technical Specifications Clamp MOSFET: Terminal Block Input Diode At the heart of the circuit is a power MOSFET designed for Vin 20 amp continuous operation with the RC-050 version. Power Resistor GND1 GND2 Indicator LEDS: Over Voltage Vout Sense Circuit A green led is used to indicate power supply input while a R1 red led is used to indicate when the clamp is on. R2 Example 1 Green LED A single servo drive is connected to the Regen Clamp mod- Power Indication ule. This design will work in most cases where the load is primarily Frictional as opposed to Inertial. Red LED Clamp MOSFET Clamp Indication + Vin Circuit Diagram: 24-48 - GND1 VDC Regen Power The regeneration circuit is designed to provide a wide Clamp GND2 Supply RC-050 range of voltage clamping operation with a simple and Vout reliable design. The block diagram gives a simplified view of the circuit design showing the major parts. SV7 + - Terminal Block: A 6 connection terminal block provides easy connection Example 2 access to the clamp. The terminal are designed for wire Two servo drives are connected to the Regen Clamp mod- sizes from 12 28 AWG. ule. This design will work in cases where the load has sig- nificant Inertial content. Input Diode: The input diode provides over-voltage and reverse volt- + Vin 24-48 age protection. If the input power supply is connected in - GND1 VDC Regen Power Clamp reverse this diode will prevent failure. During over-voltage GND2 Supply RC-050 Vout conditions the diode blocks the higher regeneration volt- age from feeding into the input power supply. The input External Power R1 Resistor 10 Ohm 50W is designed to handle 20 amps continuous (RC-050) with R2 peaks greater than 100 amps. SV7 + + SV7 Drive 2 Internal Power Resistor: - Drive 2 - For moderate power operation this may be all that is required for safe operation. This resistor is designed to Dimensions sink up to 8 amps when using an 80 volt power supply, but only 2.5 amps when using a 24 volt supply. Larger power resistors can be added to the circuit by connecting between the R1 and the R2 terminals. Filter Capacitor: To smooth out operation and allow the Clamp to work at a low switching frequency a large capacitor is added across the voltage output. 0.125 3.75 4.00 Over-Voltage Sense Circuit: This part of the clamp senses when on over-voltage oc- curs. When the Vout exceeds the Vin by approximate- ly 1.2 volts the clamp will turn on. When Vout drops to about 1 volt below Vin the clamp turns off. 3.75 920-0024B 3.0 2.22 0.125 2.5 0.860