Page 66 - impiantistica_3_2015

Table 3 – Mechanical features of the variable frequency converter

Electrical (converter) − SVTN 10K8 W33 24P
Model − VSI - NPC - PWM digital - IGBT
Type − 2 quadrants w/o braking
Operational Mode sensorless
Control type − 10800 kVA
Power % 98
Efficiency at rated power − 24 pulse configuration diode rectifier
Front end AC/DC converter type V/A 4 × 1800 / 1080
Input rated voltage / current / frequency − 3 phase
Input type Hz 50
Input frequency − 0.96
Line side power factor V/A 3300 / 1666
Output rated voltage / current − 3 phase
Output type Hz 5÷70
Output frequency range dV/dt reactor
Output filter

Mechanical (cabinet) − IP 31
Protection degree − IP 20 (only for control cabinet)
Protection degree at open doors − indoor (inside LER)
Installation front
Accessibility − bottom / bottom
Cable inlet / outlet m < 250
Motor feeding cable length dB(A) 70
Noise level kg 6500
Mass − deionized water in closed loop with internal water-to-water
Primary cooling circuit heat exchanger
− water (between VFD and chiller)
Secondary cooling circuit bottom
Water inlet / outlet flanges (VFD to chiller)

Reliability and availability h 50000
MTBF (Medium Time Between Failures) min 30
MTTR (Medium Time To Repair) months 6
MTBM (Medium Time Between Maintenance)

64 Impiantistica Italiana - Maggio-Giugno 2015