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Power-Off Procedure for Maintenance of Fully Automatic Wet-Spraying Trolley
Release time:
2026-06-16
Source:
Author:
Summary:
Maintenance of fully automatic wet‑spraying trolleys must strictly adhere to the power‑off operating procedures; this is a fundamental requirement for ensuring the safety of maintenance personnel and the integrity of the equipment. Proper power‑off procedures effectively prevent electric‑shock incidents, avoid equipment damage caused by operator error, and ensure that maintenance work proceeds safely and smoothly.
I. Pre-De-energization Preparation for Maintenance
Power Outage Risk Assessment
Maintenance Work Risk Analysis:
1. High-voltage electrical system: The main circuit voltage can reach 380V/660V
2. Energy storage component risks: residual charge in capacitors, accumulator pressure
3. Control system power supply: PLC , low-voltage circuits such as sensors
4. Backup Power Supply: Power Supply Circuit of the Uninterruptible Power Supply System
Power outage plan development
Determine the scope of the power outage based on the maintenance work:
Complete power outage: involves high-voltage systems or major structural maintenance.
Localized power outage: maintenance of a specific system or component
Control circuit power outage: Maintenance work involving only the disconnection of the control power supply.
Temporary Power Outage: Short-Term Maintenance Operations
II. Standard Power-Off Procedure
Main power supply disconnected
Power-off procedure for the high-pressure system:
1. Shutdown Procedure: Stop the equipment according to the standard operating procedure.
2. Key switch: Turn the main switch to "OFF" Location
3. Isolating switch: Disconnect the main circuit isolating switch.
4. Power lockout: Lock and tag " Closing prohibited " Warning sign
Backup Power Handling
Auxiliary power system power failure:
UPS System: Shut down and disconnect the output switch.
Battery: Disconnect the positive and negative terminals.
Emergency Power Supply: Shut Down the Standby Generator
Backup circuit: Inspect and disconnect all backup power sources.
III. Discharge of Energy Storage Components
Capacitor discharge operation
Residual Charge Discharge of Electrical Components:
Power capacitors: Discharge using a dedicated discharge rod.
Filter capacitor: Automatically discharges through a discharge resistor.
Control capacitor: Short-circuit the discharge terminal.
Waiting time: Allow to stand after discharge. 5 More than a minute
Hydraulic energy storage release
Pressure can be safely released:
1. Accumulator: Open the relief valve until the pressure reaches zero.
2. Hydraulic lines: Operate the directional control valve to relieve residual pressure.
3. Actuating element: manually operated reciprocating motion of the hydraulic cylinder
4. Pressure Verification: Use a pressure gauge to confirm zero pressure.
IV. Power-Off Confirmation Procedure
Voltage detection
Electrical System Power-Off Verification:
Main circuit inspection: Use a multimeter to measure the phase-to-phase voltage.
Control circuit: detection PLC Power terminal voltage
Sensor circuit: Check the signal line voltage.
Grounding Verification: Confirm the reliability of equipment grounding.
Mechanical Status Confirmation
Safety status of moving parts:
1. Actuating mechanism: Confirm complete stop and secure.
2. Rotating components: Lock using the braking device.
3. Gravity Component: Install Safety Support Device
4. Scope of movement: Install conspicuous warning signs.
V. Special Maintenance Power-Off Requirements
Control System Maintenance
Power-off maintenance of electronic equipment:
Data Backup: Save parameters and programs before power loss.
Module disassembly: Disconnect the cables in sequence.
Electrostatic Protection: Wear an anti-static wrist strap.
Component Protection: Special Treatment for Sensitive Components
High-pressure system maintenance
Special requirements for the power supply system:
1. Insulation Testing: Use a megohmmeter to measure insulation resistance.
2. Safety distance: Maintain sufficient operating space.
3. Protective equipment: Wear insulated shoes and gloves.
4. Guardianship System: Designate a Dedicated Guardian
VI. Power Restoration Procedure
Pre-energization inspection
Preparations for restoring power supply:
Tool Inventory: Confirm that all tools have been collected.
Personnel Confirmation: All maintenance personnel have evacuated.
Equipment Status: All components are installed securely and reliably.
Insulation Testing: Insulation Resistance Measurement of Critical Circuits
Tiered power supply
Restoring power supply in an orderly manner:
1. Closing the main power supply: Close the isolating switch first, then close the circuit breaker.
2. Control System: Restore Control Power Step by Step
3. Execution System: Restore Power Supply Last
4. Functional Testing: Gradually validate the functionality of each system.
VII. Safety Management Requirements
Personnel Qualification Management
Maintenance Personnel Qualification Requirements:
Professional Skills: Holds an electrician’s operating certificate.
Equipment Training: Completed specialized equipment training
Safety Knowledge: Master Electrical Safety Procedures
Emergency Response Capability: Possesses the ability to handle accidents.
Supervision and Management System
Work Process Supervision:
1. Work Permit System: Written Confirmation of Power-Off Scope
2. Guardian System: Designate a Full-time Safety Guardian
3. Inspection System: Regular Inspection of Power-Off Devices
4. Record-keeping system: Maintain detailed records of the power outage procedure.
Conclusion
The power‑off requirement for maintenance operations on fully automatic wet‑spraying trolleys is a critical measure to ensure repair safety. By establishing comprehensive power‑off procedures and rigorously enforcing safety management protocols, electrical shock accidents and equipment damage can be effectively prevented. It is recommended to develop detailed power‑off work instructions, strengthen training for maintenance personnel, and provide the necessary personal protective equipment to ensure that all power‑off measures are properly implemented. At the same time, emphasis should be placed on summarizing practical experience and continuously improving safety management practices, thereby providing reliable safety assurance for equipment maintenance activities.
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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