24 pulse Variable Frequency Drive for ESP
IEEE 519 VFD
24 pulse front end design
24 pulse front end is a separate power supply unit. It is composed of diode bridges, heatsinks, breakers, DC chokes, pre-charge circuits and cooling fans. 24 pulse front-end units can be matched with the existing EVR3 series VFDs to be 24 pulse VFDs solution
Cost-effective outdoor 24 pulse VFD
Outdoor design VFDs for harsh environments operating. Compared to two parallel 12 pulse VFD solutions or four parallel 6 pulse, there is only one inverter and one output sine wave filter supplied power by a 24 pulse front end. Smaller footprint, lower cost and higher reliability.
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Specifications
Input power supply3 phase 380V to 480V ±10%, 50/60Hz ±5% 
Converter type 24 pulse diode front end
Inverter type IGBTs 
Input current protectionCircuit breaker 
Input surge suppression IEC test classification / EN type: II/T2 

Maximum continuous voltage: 350V(L-PE)

ISCCR: 50kA (max.200A gG)

Voltage protection level: 1500V

In: 20kA 8/20 μs 

Imax: 40kA 8/20 μs 
Input power balance Standard input DC reactors 
Output voltageThe same as power supply 
Output frequency 0.1Hz to 120Hz 
Output waveformHigh performance Sinewave 
Motor controlConstant or Variable Torque (V/F) 
Motor technology Induction motor (IM) or Permanent Magnet Motor (PMM) 
Efficiency ~96% at full load 
Power factor 0.98 across entire speed range 
Overload rating120% for 1min/5min 
Certifications ISO90001 ISO14001
Enclosure rating Junction box & main power section: IP66 [ equivalent to NEMA4 ] 

24 pulse front end section:IP55 [ equivalent to NEMA3 ]

Magnetics section: IP24 [ equivalent to NEMA3R ]

Backpack section: IP24 [ equivalent to NEMA3R ]

Cooling system IP66: air-conditioning unit, heat sink 

IP24 & IP55 : forced air cooling 
Altitude 0 to 1000m without derating 
Ambient operating temperature-30 ℃ to 55
Relative humidity 20% to 95% maximum(noncondensing) 
H2S protection Conformal-coated PCBs & bus bars 
Material Carbon steel, the thickness is 2.5mm 
Line-side termination Lugs in power junction box
Load-side terminationLugs in power junction box
Control terminationMounting plate on the dedicated swing door 
Safety features Emergency stop button

Electronic interlocks 

Separated power and control sections 

Backspin indication LED on the front door 

Prewired IO junction box 
Analog inputs (AI)Qty 2: 4-20mA, resolution 12 bits 
Digital inputs (DI) Qty 5: DC24V, sink wiring 
Digital outputs (DO) Qty 4: relay output, NO, up to 5A 
Serial communicationQty 1: RS485 Modbus Master (for DHS)

Qty 1: RS485 Modbus Slave (for SCADA) 


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Address
No.15-1, Ligang Park, Shuanggang Industry Zone, Jinnan District, Tianjin
E-mail
zhangyu@dcus.cn guoliwei@dcus.cn
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