120kW-200VAC load Bank

3. Core Component Material & Process Introduction

3.1 Load Resistor Unit

1. AdoptFe-Cr-Al alloy resistance wire with high temperature resistance, oxidation resistance and excellent thermal stability

2. Even heat generation, no deformation or aging under long-term full-load operation, small resistance drift

3. Optimized for 400Hz intermediate frequency working conditions, low reactive loss and stable pure resistive characteristics

3.2 Cooling Fan System

1. 120kW 200V Portable AC Load Bank is equipped with special low-noise axial flow fans, high strength, corrosion resistance and long service life

2. Large air volume and air pressure to quickly dissipate heat from load modules

3. Multiple mechanical temperature sensors installed in load area and air outlet; automatic load shedding and alarm once over temperature

4. Fan interlock logic: load can only be switched on after fan runs normally to avoid overheating burnout

3.3 Electric Control & Data Acquisition Core Parts

1. Contactor: Schneider LC1D series, contact anti-ablation and reliable action

2. Low-voltage control parts: Chint / Schneider circuit breakers, push buttons and indicator lights

3. Data Acquisition: Qingzhi multi-functional meter for accurate real-time collection of voltage, current, power and frequency

4. Conductive Parts: Pure copper busbar, low heat generation and excellent oxidation resistance

4. Standard Operation Instructions

4.1 Pre-operation Inspection

1. Placement: Put on flat indoor ground; reserve ≥30cm ventilation space on side air inlet/outlet; do not block air ducts

2. Appearance Check: No cabinet damage; casters locked firmly; aviation socket intact and tight

3. Circuit Check: No internal wiring aging; terminals well fastened; meter and indicators in good condition

4. Environment Check: Keep away from flammable materials and strong electromagnetic interference; dehumidify in high humidity environment in advance

4.2 Wiring & Power-on Procedure

1. Load Wiring: Connect to generator/power supply with dedicated aviation plug;no hot plugging allowed

2. Switch on 220V/50Hz control power; device enters self-check and standby mode with panel lighting up

3. Confirm no fault alarm and reset emergency stop button to normal status

4.3 Load Testing Operation

1. Increase load step by step via local knob: 0→25%→50%→75%→100%; do not directly switch to full load at one time

2. Support sudden load increase and decrease to simulate actual power impact scenarios

3. Observe real-time voltage, current, frequency and power on panel and check fan running sound

4.4 Shutdown & Completion Procedure

1. Reduce load step by step to zero; keep fan running for 3~5 minutes for heat dissipation

2. Cut off control power after full cooling, then disconnect aviation plug

3. Clean dust and moisture on cabinet surface, lock casters and store properly

5. Daily Maintenance Guide by Cycle

5.1 Immediate Maintenance After Each Use

1. Clean dust and debris on cabinet surface and side air inlet/outlet to keep air duct unobstructed

2. Check aviation plug insertion & extraction; confirm no overheating or oxidation on terminals

3. Inspect fan operation for abnormal noise or stuck rotation; reset emergency stop button

4. Wipe moisture on cabinet, cover interface with dust cap and organize supporting documents

5.2 Monthly Regular Maintenance

1. Thoroughly clean dust on fan blades and load modules

2. Check Schneider contactors and circuit breakers for contact ablation or blackening

3. Fasten internal copper busbars and wiring terminals to prevent loosening from long-term vibration

4. Calibrate measurement accuracy by comparing with standard instrument; calibrate immediately if deviation exceeds standard

5.3 Quarterly / Annual Professional Maintenance

1. Inspect overall insulation resistance with megohmmeter when power off, comply with Class F insulation standard

2. Test all protection functions including over-temperature, over-voltage, fan interlock and emergency stop one by one

3. Check resistance wire for deformation, aging or partial discoloration

4. Run full-load continuous test for 1 hour, record parameters, temperature and alarm status, keep test files

5. Lubricate bottom casters to ensure smooth movement

5.4 Long-term Storage Maintenance

1. Store in dry, ventilated and shaded warehouse with ambient temperature 0℃~40℃

2. Power on every 3 months for 30 minutes to run fan and load to dispel internal moisture

3. Install dust caps on aviation socket and interfaces; keep cabinet moisture-proof and rust-proof

4. Do not place heavy objects on top to avoid cabinet deformation and internal component displacement

6. Full Analysis of Safety Protection Functions

1. Over-voltage Protection: Automatically unload and trigger alarm when input voltage exceeds safety threshold, protecting both tested power supply and 120kW 200V Portable AC Load Bank

2. Over-temperature Protection: Multi-point temperature sensors monitor load module temperature in real time; automatic load shedding to prevent resistance burnout

3. Emergency Stop Protection: One-click manual forced unloading; loading function disabled under emergency stop lock; fan power remains on for continuous heat dissipation

4. Fan Interlock Protection: Load circuit locked if fan fails to start or stops abnormally, avoiding high-temperature damage without cooling

5. Adaptive Overload Protection: Step gear design avoids instantaneous overload impact, adapting to various 400Hz power supply voltage fluctuation conditions

7. Frequently Asked Questions

1. Power on normally but cannot load? 

Check three points:

① Fan not started, fan interlock locks loading function;

② Emergency stop button not reset;

③ Poor aviation plug contact or insufficient control voltage.

2. Frequent over-temperature alarm during operation? 

① Side air inlet/outlet blocked or dusty;

② Ambient temperature over +55℃ in closed high-temperature space;

③ Fan aging with insufficient speed;

④ Long-term full-load continuous operation without rest.

3. Large deviation in voltage and power measurement? 

① Poor wiring contact with large contact resistance;

② Parameter fluctuation caused by fast load switching;

③ Meter out of calibration for long time. Reconnect and recalibrate; contact manufacturer to inspect acquisition unit if fault remains.

4. Support parallel connection for capacity expansion?

Yes, 1+N parallel connection is fully supported for high-power generator testing. Keep same voltage, frequency and synchronous gear adjustment for stable combined load operation.

5. Suitable for long-term use in high humidity and coastal salt fog environment?

 The unit can withstand over 95% RH originally; IP20 is suitable for indoor coastal machine rooms. Clean salt fog dust monthly and conduct regular insulation test to extend service life greatly.

6. Only for 400Hz equipment testing?

 Mainly designed for 400Hz intermediate frequency, also compatible with 50Hz power frequency equipment for resistive load testing with valid display and protection functions.

7. Can 120kW 200V Portable AC Load Bank be used outdoors exposed to the elements? 

Not recommended. This is an indoor IP20 model without rainproof, sunproof and outdoor dustproof design; outdoor use easily causes water condensation and internal electrical damage.

8. How to reset after fault alarm? 

Unload to zero first, cut off control power, troubleshoot temperature/voltage/fan faults; restart power after eliminating hidden dangers, protection logic will reset automatically.

8. Real Application Cases & Customer Reviews

Case 1: Military Intermediate Frequency Power Manufacturer

1. Demand: Factory full-range load and sudden load test for 400Hz military generator sets, complying with GJB military standard acceptance.

2. Application Effect: 120kW step loading accurate with actual error stably within ±2%; four-fold protection avoids short circuit and over-temperature damage to prototype; built-in meter eliminates external testing equipment.

3. Efficiency Improvement: Replaced old split load equipment; single-person operation available; daily inspection capacity increased by 45%, no hardware failure within three years.

4. Customer Review: Compact size with casters for flexible workshop movement, accurate parameters and complete protection, fully meets military factory acceptance requirements with simple daily maintenance.

Case 2: Coastal Marine Electrical Operation & Maintenance Company

1. Demand: Annual inspection and load capacity test for marine 200V three-phase diesel generator sets under high humidity, salt fog and large temperature difference environment.

2. Application Effect: Wide temperature adaptation from -20℃ to +55℃, stable continuous operation without condensation or tripping in high humidity; forced air cooling stable with no over-temperature trip after 4-hour full-load operation.

3. Pain Points Solved: Replace old bulky load with low precision and easy overheating; measurement accuracy doubled, annual maintenance failure reduced by 80%, better salt fog aging resistance.

Case 3: Aviation Ground Power Laboratory

1. Demand: R&D test of 400Hz inverter power supply in university research institutes, requiring frequent load switching and electrical data recording.

2. Application Effect: Smooth gear switching, supports repeated sudden load change to simulate actual working conditions; Schneider electric control components with high start-stop lifespan, no contact ablation after hundreds of daily switches; real-time panel parameters save external data acquisition cost.

Case 4: Industrial Park Standby Generator Acceptance Project

1. Demand: Factory and on-site load acceptance test of 200V industrial standby power supply, requiring portability and rapid deployment.

2. Application Effect: Only 45kg with rolling casters for easy movement, no professional installation required, plug-and-play; smooth step loading effectively detects generator voltage drop and frequency stability; test data can be directly filed for acceptance.

9. Core Advantages Of 120kW 200V Portable AC Load Bank

1. Full Standard Compliance: Compliant with national, military and industrial standards, suitable for military, marine, aviation, industrial and scientific research scenarios

2. Top-tier Brand Configuration: Schneider, Chint and Qingzhi core components, pure copper busbar and high-end Fe-Cr-Al resistance wire for ultra durability

3. Lightweight & Portable Design: 45kg body with universal casters, easy single-person moving and indoor deployment anytime

4. Complete Safety Protection: Over-voltage, over-temperature, emergency stop and fan interlock four-fold protection, automatic alarm and load shedding for safer testing

5. High Precision & Stability: High standard electrical measurement and loading accuracy, small resistance drift for long-term operation; test data valid for official acceptance

6. Flexible Expansion: 5 fixed adjustable gears plus multi-unit parallel support, meeting both low-precision fine testing and high-power combined testing

7. Low Maintenance Cost: Modular cabinet structure with universal replaceable parts; daily maintenance only requires dust cleaning and terminal fastening, cost-saving and easy upkeep

10. Cabinet Structure