Dynamic Voltage Restorer Operation Instructions

 

• Only qualified electrical engineers are permitted to perform installation, commissioning, and maintenance operations, strictly adhering to local electrical safety regulations and equipment manuals. Wear anti-static equipment during operation and maintenance to prevent electrostatic discharge damage to power and control components. While the equipment is running, do not touch any electrical parts except to view operating information via the touchscreen.
• Online DVRs contain both AC and DC power supplies; energy storage DVRs also include supercapacitors/DC bus capacitors. After a power outage, discharge and verification must be performed. Typically, this requires waiting approximately one hour and confirming with a multimeter that the DC side voltage is below 1V before opening the cover for work.
• Protective grounding (PE) must be secure and reliable. The emergency stop button should only be used in emergencies such as severe power grid failures or fires.
• The equipment must not be directly connected to life support equipment or clinical medical equipment.
• Operating environment requirements: Indoor installation, avoid direct sunlight and rain, good ventilation, and a clean environment; typical ambient temperature for online systems is -25℃ to +45℃, and for energy storage systems it is -25℃ to +55℃; equipment protection rating is generally IP20.

 

 

• Start-up Steps

1. Set the equipment to the start-up allowed state using the local start/stop knob or touchscreen, and confirm there are no fault alarms.

2. Close the input switch and observe the voltage, current, frequency, and other parameters displayed on the touchscreen. Wait for the operation to stabilize (approximately 30 seconds is recommended).

3. Close the output switch to supply power to the load, and confirm that the load-side voltage, frequency, and phase sequence are correct.

4. Check the status of the operation indicator lights to confirm that the equipment has entered the "Run/Compensation Ready" state.

 

• Shutdown Steps

1. If conditions permit, unload or reduce the sensitive load first.

2. Disconnect the output switch, then disconnect the input switch to avoid voltage spikes caused by the inductive load being turned off.

3. When long-term shutdown is required, place the equipment in the shutdown state; for energy storage equipment, execute the shutdown/standby logic according to the instructions to avoid frequent deep charging and discharging.

 

 

• Local Monitoring: View "Operation Information/Fault Information" via the touchscreen, paying attention to voltage sag/boost event records, compensation activation counts, module temperature, and DC bus voltage; quickly determine the "Operation/Fault" status using LED indicators.
• Control Mode: Set between "Constant Voltage Mode/Sag Compensation Mode" according to site requirements; the energy storage device has a "Standby-Discharge (Compensation)-Charge-Fault (Maintenance)" state machine. During normal operation, the inverter is in sleep mode and synchronized with the grid; when disturbances occur, it switches to compensation in milliseconds.
• Parameter Setting: Configure voltage tolerance band, compensation strategy, alarm and protection thresholds, communication parameters, etc., in the "Parameter Setting" interface; permission management and change logging should be performed for setting modifications.
• Communication and Interaction: Supports RS485/CAN/Ethernet interfaces for data exchange and remote control with EMS/power distribution automation systems or host computers, ensuring protocol and setpoint compatibility to avoid malfunctions.

 

 

• Power Off and Discharge: Disconnect all power before maintenance, follow the discharge procedure in the manual, and use instruments to confirm that the DC side voltage is below 1V; confirm the PE connection is reliable before opening the cover.
• Routine Maintenance: Regularly check the tightness of power connections, terminal oxidation, cooling channels and fans, insulation and grounding resistance, environment, and ventilation; for online systems with typical IP20 protection, keep the cabinet clean and dry to avoid condensation and dust accumulation.
• Condition-Based Maintenance: Conduct predictive maintenance based on historical fault and trend data, promptly replace aging components, and restore performance and safety margins.

 

Quick Troubleshooting for Common Faults:

• No voltage output and no panel indication: Check the input switches and fuses to confirm the input power supply is normal.
• No voltage output but normal frequency display and alarm: This may be due to overload/excessive starting current. First, disconnect the output and input switches, reset them, and then try connecting the load in batches.
• Unresolved faults: Contact the manufacturer or authorized service provider for assistance. Do not operate the device while it is malfunctioning.

 

 

• Wiring and Cabling: Strictly distinguish between power cables and communication cables, lay them separately and maintain a distance (recommended >0.2 m), and ensure they cross at a 90° angle. Before wiring, double-check the input/output/PE polarity to prevent incorrect connections that could damage equipment or cause personal injury.
• Operating Boundaries: Avoid prolonged operation of equipment beyond its rated capacity. For energy storage devices, follow the manufacturer's charging and discharging strategies to avoid overcharging/over-discharging. For online devices, assess whether capacity and strategies need optimization when the power grid experiences frequent anomalies.
• Bypass and Maintenance: Familiarize yourself with the usage scenarios and switching logic of maintenance bypass/fault bypass to ensure uninterrupted power supply and reliable isolation between the device and the power grid during maintenance.
• Environment and Health: Keep the installation location well-ventilated, dry, and dust-free, away from flammable and corrosive gases; the equipment generates some noise and electromagnetic radiation during operation, and should be placed in an industrial environment according to EMC and noise level requirements.