AMCI SV160E2, User Manual, Page: 75 / 120

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SV160E2 User Manual
B
RAKING
R
ESISTOR
C
ALCULATIONS
75
Step 4: Determine Minimum Braking Resistor Value
This is the minimum resistor value allowed in the circuit. Using a lower resistance value may
damage the Braking Resistor circuit. The chosen resistor value must be between the minimum
value determined in this step and the maximum value determined in step 5.
Step 5: Determine Maximum Braking Resistor Value
This is the maximum resistor value allowed in the circuit. Using a higher resistance value may
cause an overvoltage error and loss of motion control during deceleration. The chosen resistor
value must be between the minimum value determined in step 4 and the maximum value deter-
mined in this step.
Step 6: Determine Average Power Rating
To determine the average power dissipated by the braking resistor, you have to determine the peak power dis-
sipated during each deceleration phase of your machine cycle, and the minimum cycle time of your machine.
R
Bmin
V
d
10 amps
-------------------- =
R
Bmin
Braking Resistor minimum value in ohms =
V
d
Programmed Overvoltage Threshold (55.0 to 100.0 Vdc) =
10 amps Maximum allowable current through Braking Resistor circuit. =
R
Bmax
V
d
 
2
P
b
------------- =
R
Bmax
Braking Resistor maximum value in ohms =
V
d
Programmed Overvoltage Threshold (55.0 to 100.0 Vdc) =
P
b
Peak Breaking Power calculated in Step 3. =
P
av
T
dn
T
c
--------
P
bn
2
---------

in

on
+
 

sn
-----------------------------
1
n

=
T
dn

n

th deceleration time in seconds =
T
c
Minimum machine cycle time in seconds =
P
bn
Peak power rating during

n

th deceleration period. =

in
Initial Speed in radians/sec during

n

th deceleration period. =

on
Final Speed in radians/sec during

n

th deceleration period. =