Lenze S94P01B2 - Manual (Page 41)

S94P01B2
39
Parameters
5.3.14 Regen Duty Cycle
This parameter sets the maximum duty cycle for the brake (regen) resistor. This
parameter can be used to prevent brake resistor overload. Use the following formula to
set the correct value for this parameter.
D = P * R / (Umax) 2 * 100%
where:
D (%)
regen duty cycle
Umax (V) bus voltage at regen conditions.
Umax=390V for 230VAC drives and 770V for 400/480VAC drives
R (ohm) regen resistor value
P (W) regen resistor rated power
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_080S2F, E94_080Y2N,
E94_100S2F, E94_100Y2N
20
E94_120Y2N 30
E94_020S1N, E94_020S2F, E94_020Y2N,
E94_040S1N, E94_040S2F
40
E94_040T4N, E94_050T4N, E94_060T4N 75
E94_020T4N 150
5.3.15 Encoder Repeat Source
This parameter sets the feedback source signal for the buffered encoder repeat outputs
(P3.1-6). The source can be the drive’s encoder input (P4) or an optional feedback
module (resolver, second encoder etc.)
5.3.16 System to Master Ratio
This parameter is used to set the scale between the reference pulse train (when operating
in position mode) and the system feedback device. In a single loop configuration, the
system feedback device is the motor encoder or resolver. In a dual-loop system the
system encoder is the second encoder. Refer to sections 6.3 and 6.4 for details.
5.3.17 Second to Prime Encoder Ratio
This parameter sets the ratio between the secondary encoder and the primary feedback
device when the drive is configured to operate in dual-loop mode. When the primary
feedback device is a resolver, the pulse count is fixed at 65,536. The resolutions of
encoders are “post quadrature” (PPR x 4). Refer to section 6.4.
NOTE
Post quadrature pulse count is 4X the pulses-per-revolution (PPR) of the encoder.
5.3.18 Autoboot
When set to “Enabled” the drive will start to execute the user’s program immediately
after cold boot (reset). Otherwise the user program has to be started from MotionView
or from the Host interface.