Operation
Theory of Operation
QuickStick HT User Manual
241
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
any part of a magnet array over them. A neighboring block can be within another motor as
would be the case for the first and last blocks within a given motor.
The current in these available blocks ramps linearly to 15 A over a 20 volt range from +405V
DC to +425V DC. The coil current remains constant at 15 A for voltages above +425V DC
and drops to zero for voltages above +430V DC since all inverters are turned off. This behav-
ior is shown in
Figure 6-8: Individual Block Current vs. Internal Propulsion Bus Voltage
With a nominal block coil resistance of 4.5 Ohms, the dissipated power is 1 kW per block
when the 15 A current level is reached and remains at this level up to +430V DC. The dissi-
pated power vs. the internal propulsion bus voltage is shown in
Figure 6-9: Power Dissipation Per Block vs. Internal Propulsion Bus Voltage
Power-Related Warnings and Faults when using QSHT 5700 Inverters
The power distribution system experiences voltage drops when the motors draw power to
move vehicles and voltages increases during regeneration events when vehicles slow down.
These fluctuations can lead to the motor issuing warnings and faults and can cause motor
shutdown.
C
u
rren
t
(A
)
Internal Bus Voltage (VDC)
400
403
407
410
413
417
420
423
427
430
0
5
10
15
Internal Bus Voltage (VDC)
400
403
407
410
413
417
420
423
427
430
0
1000
500
P
o
we
r Dissapat
ed
per Block (
W
)