Model: NL-DZWT-1
The problem
Locked-rotor operation is a mandatory abnormal test for air-conditioner, heat-pump and dehumidifier motors: with the rotor seized, current surges and winding and case temperatures climb within minutes, and a failed protector means burnt machines or fire. Manual probing misses points and repeats poorly, and juggling separate instruments for residual current, multi-point temperatures and protection counts leaves no single complete report.
Capability
A three-jaw locking device seizes the rotor to reproduce true locked-rotor conditions; a timber base plate offers both bolted and bolt-free motor fixtures. Samples reach 2000W and 2000rpm on a 220V/50Hz supply. Test voltage and current accuracy is 2 percent plus two digits; surface temperature is sensed from 20 to 350C on multiple channels simultaneously; test duration runs from 0 to 999h59m within 2 percent. Residual current, maximum motor power and protection action counts are logged automatically. Temperature-time and power-time curves plot in real time with USB data export and curve printing. The protection chain covers over-voltage, over-current, under-voltage, phase loss, phase-sequence error, three-phase imbalance, overload, over-temperature and leakage; on any fault the LCD shows the alarm code and cuts the main circuit until the fault clears, and the supply interlock prevents misoperation while running. A true-colour touch screen runs both fixed-value and programmable modes.
Key specifications
- Application: locked-rotor abnormal operation per GB 4706.32 and GB 4706.1
- Rotor lock: three-jaw locking device
- Fixtures: timber base plate with bolted and bolt-free motor fixtures
- Samples: maximum 2000W and 2000rpm
- Supply: AC220V/50Hz
- Accuracy: voltage and current 2 percent plus two digits
- Temperature: 20-350C surface sensing, multiple simultaneous channels
- Duration: 0-999h59m settable within 2 percent
- Logging: residual current, maximum power, protection action counts
- Curves: real-time temperature/power versus time, USB export and printing
- Protection: over/under voltage, over-current, phase loss, phase sequence, imbalance, overload, over-temperature, leakage
- Fault handling: LCD alarm code and main-circuit cut-off until cleared
Applications
Locked-rotor type testing at air-conditioner, heat-pump and dehumidifier plants; safety verification at compressor and fan-motor manufacturers; abnormal-operation commission testing at third-party laboratories; laboratory capability extension and arbitration retests
About the manufacturer
Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and long-term technical service; 12-month warranty and long-term spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.