Selection Guide; Selection Flow Chart - Danfoss VLT Brake Resistor MCE 101 Design Manual

Selection Guide

8 Selection Guide

8.1 Selection Flow Chart

To select the correct size of brake resistor for an application, refer to the flow chart in Illustration 8.1.
1. Select an answer to each question from the top down.
2. Follow the answer to reach the next question, or to obtain guidance in calculating inertia or duty cycle.
3. The final box indicates the correct selection table, or whether to call hotline for additional guidance.
8 8
Low intertia
ramp down>15 s
Select a 10%
duty cycle brake
resistor from the
selection tables
Illustration 8.1 Brake Resistor Selection Flow Chart
1) When contacting Danfoss, provide the following data:
•
Nominal power 100%
•
Maximum power during brake cycle
•
Braking time/duty cycle
•
Supply voltage (max. DC)
•
Resistance (Ω)
•
With or without temperature switch
•
IP enclosure rating
•
Type of reference drive
32
Design Guide
Horizontal
Low or high
intertia?
High inertia
ramp down<15 s
or don't know
Calculate duty
duty cycle <10%
duty cycle ranging
from 10-40%
Select a 40%
Select a 10%
duty cycle brake
duty cycle brake
resistor from the
resistor from the
selection tables
selection tables
Danfoss A/S © Rev. 05/2014 All rights reserved.
Horizontal or
vertical movement?
Vertical
Braking time<
brake resistor period
cycle
duty cycle >40%
Please contact
1)
Danfoss
Determine braking
time of the
application
Compare the braking
time with the resistors
braking period
Braking time>
brake resistor period
Please contact
Danfoss
MG90O202
1)