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2 Installing and Connecting–Up
2.2 Electrical system requirements
2-42
S
Regenerative feedback protection with Power Management Module
48 V DC (DC PMM/48V)
1 DC–PMM/48V can accept a braking power of 15 W.
Example:
Braking 5 motors, that individually have a rated current of 5 A and a
regenerative feedback energy of 3.5 Ws per braking operation, once
simultaneously, then a DC–PMM/48V is sufficient for this single
braking operation.
However, in this case, it is not possible to continuously brake the
motors per second or over a longer time period, as in this case, the
maximum permissible continuous power of 15 W would be ex-
2
ceeded and the I
t monitoring would respond. The unit goes into a
"fault" condition and can only be restarted after a "reset".
– Total current through the PMM:
– Pulse load at the pulsed resistor:
– Continuous power through
the pulsed resistor:
In this application, a maximum of only 4 motors could be braked
once per second or over a longer periods of time without the I
monitoring responding and causing the unit to go into a "fault" condi-
tion (4 x 3.5 Ws /1s = 14 W < 15 W).
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
5 x 5 A = 25 A
5 x 3.5 Ws = 17.5 Ws
17.5 Ws/1s = 17.5 W
E Siemens AG 2013 All Rights Reserved
02.99
06.05
2
t
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