REGENERATIVE DC COMMON BUS SUPPLY 13
LED DESCRIPTIONS
Regen Active LED
This LED indicates when the
AC Regen is active
Under-voltage LED
The under-voltage LED becomes lit when the DC
bus voltage or AC line voltage drop below the
minimum level. This fault is automatically cleared
after the under-voltage condition disappears and the
voltages stabilize.
Over-voltage LED
The over-voltage LED becomes lit when the DC bus
voltage or AC line voltage exceed the maximum
level. This fault is automatically cleared after the
over-voltage condition disappears and the voltages
stabilize.
Phase-loss LED
The phase-loss LED becomes lit when a phase-loss
condition is detected or the AC line voltage drops
below the minimum value. This fault is
automatically cleared after the AC line voltage and
phase stabilize.
Current Limit LED
This LED is lit whenever the DC current is over the
rated level.
Over-temperature
The over-temperature LED becomes lit when the
heatsink temperature exceeds the maximum level.
The first fault is automatically cleared after the
temperature drops to an acceptable level. If a
second fault occurs within a minute, the fault is
latched and clearing it requires a Regen reset.
Over-current LED
This fault is latched and clearing it requires a Regen
reset after a 60 second timeout period.
SMPS LED
The SMPS LED becomes lit when the control supply
drops below normal. The first fault is automatically
cleared after the control power supply stabilizes. If a
second fault occurs within a minute, the fault is
latched and clearing it requires a Regen reset.
LEDs: at Start and Reset
*
While the
AC Regen is detecting the line frequency
all LEDs except the Regen Active LED will be lit.
*
If the
AC Regen reset line is held active the drive
will rapidly flash (every 100msec) all LEDs (except
LED 1) to indicate that it is waiting for the reset
line to be released.
LED 1
LED1 becomes lit when there is charge at the DC
bus -Regen bus or drive bus.
To avoid a hazard of
electric shock, after the input and control
power is removed from the
AC REGEN and the
drive connected to it, wait five (5) minutes for
bus capacitors to fully discharge.
Kernel LED
The flashing Kernel LED is the microcontroller
"heartbeat" indicating the CPU is operating properly
.
SIZING THE
AC REGEN
The following calculations can be used to size the
AC REGEN.
Step 1: Determine the Total Inertia
wk
wk
[wk L (GR) ]
2
T
M
2
2
2
in (lb-ft
2
)
wk
M
2
Motor inertia in (lb-ft
2
)
wk
L
2
Load inertia in (lb-ft
2
)
GR
Speed reduction ratio:
Output
RPM
Input RPM
Step 2: Determine the Required Braking
Torque
TQ
wk
N
N
t
B
T
d
2
2
1
308
[
]
in (lb-ft)
wk
T
2
Total inertia in (lb-ft
2
)
N
1
Motor minimum speed in (RPM)
N
2
Motor maximum speed in (RPM)
t
d
Motor deceleration time in (Sec)
Step 3: Determine the Required
AC REGEN
HP
TQ
N
B
B
2
5250
in (Hp)
HP
B
Maximum horsepower at maximum motor speed
Regen DC current =
0
.
2
HP
B
for 240Vac drives
Regen DC current =
0
.
1
HP
B
for 480Vac drives
Regen DC current =
8
.
0
HP
B
for 575Vac drives
