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Rockwell Automation| DySC – Dynamic Sag Corrector Family
Voltage Sags Defined
What is a Voltage Sag?
Voltage Sag – a decrease in RMS Voltage for a brief time
Voltage Sags less than 2 seconds account for over 90% of all grid events*
Causes of Voltage Sags
Voltages sags can originate outside your facility or be internally generated
Externally Generated Internally Generated
Weather Related
Animal Contact
Human Contact
Equipment Failure
Internally Generated
Transformer Inrush
Cross Line Motor Starting
Equipment Faults
Impacts of Voltage Sags
Voltage sags can impact your business in a variety a way
Scrap Material
Material damaged as a result of voltage sags either must be reworked or scrapped.
Extended Downtime
Processes shut down by voltage sags can take hours to reset and restart.
Damaged Equipment
Voltage sags can damage equipment due to improper equipment shutdown or current surges when voltage returns to normal.
Safety Risks
Voltage sags can lead to unintended equipment operation and other safety risks.
DySC Portfolio Overview
DySC – Dynamic Sag Corrector
- DySC® (pronounced “Disk”)
- “Battery-free UPS”
- Up to 5 seconds of ride-through
- S. and International voltages available
- Scalable solution
- Large Available Power Range
- Scalable Energy Storage
DySC Portfolio
Standard Products Shown – other options available through ETO (engineer to order) process
MiniDySC®
Current Range – 2A-50A
Voltage Range – 100V–240V
1 Phase
DIN Rail / Panel Mount
Component / Control Panel
Solution
Bypass Optional
ProDySC®
Current Range – 25A-200A
Voltage Range – 200V–480V
3 Phase
Panel / Floor Mount
Individual Machine / Tool
Solution
Bypass Optional
MegaDySC ®
Current Range – 400A2400A
Voltage Range – 380V–480V
3 Phase
Floor Mount
Process Line / Buss Level
Solution
Bypass Standard
MegaDySC – 208V
Current Range – 500A-833A
Voltage Range – 200V–208V
3 Phase
Floor Mount
Process Line / Buss Level
Solution
Bypass Standard
DySC Features and Benefits
3 Phase Ride through Example
- 330 kVA DySC
- 3-phase 50% voltage sag
- 4.5 second duration
DySC Technology Overview
How a DySC Works
• Under normal conditions, the DySC passes power from the AC supply directly to the critical load
through a bypass switch.
• When a voltage sag is detected the DySC opens the bypass switch and injects a compensating voltage in series with the AC supply.
• DySC is series-connected: AC Supply Voltage + DySC Voltage = Critical Load Voltage
Single-phase DySC Topology
Component Identification
Static Bypass Switch
- ON under normal conditions
- Highly efficient (>99%)
Voltage-doubling Rectifier
- Each DC bus capacitor charged to peak of AC source voltage
- Idle under normal conditions
- Supplies power to inverter at DC bus during sag correction
Half-bridge Inverter
- Idle under normal conditions
- Sinusoidal PWM switching during sag correction
- Acts as a series voltage source between points A and B, supplying only the missing voltage
MiniDySC Standard Runtime (SR) Protection Curve
- MiniDySC corrects voltage sags down to 50% remaining for up to 5 seconds.
- For voltage sags below 50% remaining, capacitor energy will provide protection for up to 50ms at 0V
Extended Runtime (ER) DySC
Extended Run Capacitors
- Additional capacitors increase runtime for voltage sags with less than 50% voltage remaining.
- Capacitors charge through series resistors and discharge through bypass diodes to reduce inrush
- Separate electrolytic capacitor bank for each phase module.
MiniDySC Extended Runtime (ER) Protection Curve
- MiniDySC corrects voltage sags down to 50% remaining for up to 5 seconds.
- For voltage sags below 50% remaining, capacitor energy will provide protection for up to 200ms at 0V
3 Phase ProDySC and MegaDySC Topology
Cross-Coupling
- Most events are single phase or two phase sags
- Cross-coupling transformer pulls energy from “good” phases for correction
- 0 seconds sag correction for single-phase sag to 0.0 volts, or two-phase sag to 30% (L-N).
One of three identical circuits is shown:
ProDySC and MegaDySC Protection Curve
DySC Bypass Switch
- MiniDySC – Manual rotary bypass switch is optional (recommended)
- ProDySC up to 100A – Manual rotary bypass switch is optional (recommended)
- ProDySC 200A – Automatic 3 breaker bypass switch is optional (recommended)
- MegaDySC – Automatic 3 breaker bypass switch is standard
Source: Rockwell Automation
