Vacon NXP series, System Hardware Manual

Page: 4 / 83

vacon • 4
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6.1 Control and interface .......................................................................................................... 67
6.1.1 Control without speed feedback (open loop)........................................................ 67
6.1.2 Control with speed feedback (closed loop) .......................................................... 67
6.2 Load definitions ................................................................................................................... 67
6.2.1 Pump and fan load ................................................................................................ 68
6.2.2 OL( n
base
) > OL( n
max
) for constant torque load ..................................................... 69
6.2.3 Starting torque >> OL(
n
max
) for constant torque load ......................................... 70
6.2.4 OL(
n
base
) > OL(
n
max
) for constant power load...................................................... 71
6.2.5 OL(
n
base
) < OL(
n
max
) for constant power load...................................................... 72
6.3 Technical specifications for VACON
®
drives ...................................................................... 73
6.3.1 NXN - Non-regenerative front end units.............................................................. 73
6.3.2 NXA - Active front-end units................................................................................. 75
6.3.3 NXI - Inverter units ............................................................................................... 77
6.3.4 NXB - Brake chopper units................................................................................... 82