Lenze S94P01G Position Servo - Manual (Page 45)

S94P01G
43
Parameters
5.3.14 Regeneration Duty Cycle
This parameter sets the maximum duty cycle for the brake (regeneration) resistor. This
parameter can be used to prevent brake resistor overload. Use the following formula
to calculate the maximum value for this parameter. If this parameter is set equal to
the calculated value, the regeneration resistor is most effective without overload. One
may set this parameter with a value smaller than the calculated one if the drive will not
experience over voltage fault during regeneration.
D = P * R / (Umax) 2 * (1/D
application
) * 100%
Where:
D (%) regeneration duty cycle
Umax (VDC) bus voltage at regeneration conditions
U
max
= 390 VDC for 120/240 VAC drives and 770 VDC for
400/480 VAC drives.
R (Ohm) regeneration resistor value
P (W) regeneration resistor rated power
D
application
(%) application duty cycle. For the continuous regeneration applications,
use Dapplication = 1. For the intermittent regeneration applications, use
Dapplication = t/T, where t is the duration when regeneration is needed
and T is the time interval between two regenerations. Both t and T must
use the same time unit, e.g., seconds
t, regeneration
T-t, regeneration
is not needed
T
If calculation of D is greater than 100% set it to 100% value. If calculation of D is
less than 10% then resistor power rating is too low. For more information refer to the
PositionServo Dynamic Braking Manual (G94BR01).
Minimum Required Dynamic Braking Resistance
Drive Model DB Resistor
Minimum Resistance (Ω)
E94_180T2N~~ 15
E94_080S2F~~, E94_080Y2N~~,
E94_100S2F~~, E94_100Y2N~~
20
E94_120Y2N 30
E94_020S1N~~, E94_020S2F~~,
E94_020Y2N~~, E94_040S1N~~,
E94_040S2F~~, E94_040Y4N~~
40
E94_090T4N~~ 45
E94_040T4N~~, E94_050T4N~~,
E94_060T4N~~
75
E94_020T4N~~ 150