Leroy-Somer DIGIDRIVE SK Series, Technical Data Manual, Page: 10 / 34

Technical
data
Derating curves
and losses
Drive voltage
levels
DC bus
design
Mechanical
installation
EMC filters Line chokes
Motor cable
lengths
General
data
I/O
specification
Supply types Options
10
Digidrive SK Technical Data
www.leroy-somer.com Issue Number: a
3 Drive voltage levels
* These are the absolute minimum DC voltages that the drive can be supplied with. If the drive is not supplied with at least this voltage, it will not reset
out of a UU trip at power up.
Output frequency: 0 to 1500Hz
Output voltage: 3 phase, 0 to drive rating (240 or 480Vac maximum set by Pr
08 ).
Low DC bus operation (Pr 6.10)
0 Low DC bus operation disabled
1 Low DC bus operation enabled
The Low DC bus operation is designed to enable 3 phase 400VAC (medium voltage) Digidrive SKs to be run off a single phase 200VAC (low voltage)
supply in the event of a primary 400VAC supply failure.
When the primary supply fails, the back up supply can be switched in. This will allow the drive to control the motor at a reduced power, for example to
move an elevator up or down to the next floor.
There is no de-rating as such when low DC bus operation is enabled however the power will be limited by the reduced voltage and ripple generated
on the DC bus of the drive.
Figure 3-1 Low DC bus operation
When Pr 6.10 is enabled and the DC bus voltage is less than 330VDC, the drives display will flash LoAC (Low AC) to indicate that it is running off the
low voltage back up supply.
N
This mode is designed for use with a backup power supply and not for using a 400VAC (medium voltage) Digidrive SK in a 200VAC (low voltage)
application. As shown in the above diagram, the drives power down save parameters are saved at point 2. If the drive was to be used on a 200VAC
supply, the DC bus will never fall through point 2 and power down save parameters will not be saved.
Low DC bus operation voltage levels (Pr 6.10 enabled)
>425VDC - normal operation
<330VDC - LoAC operation
<230VDC - UV trip
Condition 200V drives 400V drives
OV trip level 415 Vdc 830 Vdc
Braking level 390 Vdc 780 Vdc
Rated upper level (AC mains +10% x 1.4142) 373 Vdc 747 Vdc
Rated lower level (AC mains -10% x 1.4142) 255 Vdc 484 Vdc
*UV reset level 215 Vdc 425 Vdc
UV trip level 175 Vdc 330 Vdc
Standard ramp voltage 375 Vdc
EUR: 750 Vdc
USA: 775 Vdc
DC
B
us
(VD
C
)
600
200
400
0
NOTE