External Encoder And Sensors; External Encoder; Sensor - Danfoss VLT ISD 510 Design Manual

System Overview
2 2
ω Start
ω Stop
Illustration 2.16 Decelerating Servo Drive
The peak power connected to line 1 can be calculated as:
P peak ISD line 1 = P
The calculation for line 2 can be done in the same way.
The maximum peak brake power is the sum of the peak
brake power on both lines when the result is a negative
value.
P peak brake = P Peak ISD line 1 + P Peak ISD line 2
With P
peak brake
calculated using the formula for brake resistance.
Calculation of brake resistor average power
The average power is determined by the length of the
braking time in relation to the process period.
P
[W]
T Process period time in s.
p
T Braking time in s.
b
Illustration 2.17 Relation between Average Power and Peak
Power
The average power is calculated as follows:
P ave =
P peak x
28
∆ω/∆t
∆t
Peak ISD 1.1 + P Peak ISD 1.2 + P Peak ISD 1.n + . . .
, the optimal resistance value can be
P
peak
P
avg
T T
p b
T p
T b
Danfoss A/S © 08/2017 All rights reserved.
®
VLT Integrated Servo Drive ISD
The duty cycle is calculated as follows:
Duty cycle [%]
Danfoss offers brake resistors with a duty cycle of
maximum 10% and 40%. If a 10% duty cycle is applied, the
brake resistors are able to absorb P
period time. The remaining 90% of the period is used on
deflecting excess heat.

2.11.2 External Encoder and Sensors

2.11.2.1 External Encoder

An external encoder can be connected to the X4
connector on the advanced servo drive or the encoder
connector on the SAB. The encoder value can be used as
guide value provider.
Further information on external encoders and sensors can
be found in the VLT
Operating Instructions.

2.11.2.2 Sensor

The M12 I/O and/or encoder connector (X4) is available of
the advanced servo drive. See chapter 6.1.2.1 Connectors on
the Servo Drives for pin assignment.
t [s]
®
510 System
T p x 100
=
T b
for 10% of the
peak
®
Integrated Servo Drive ISD
®
510
MG36C102