Siemens SIMODRIVE POSMO A

2
2.2 Electrical system requirements
2-35
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
If several SIMODRIVE POSMO A are used but they are not all simulta-
neously operational, then a lower rating load power supply can be used.
However, a short–term overload capability must be guaranteed as
otherwise when voltage dips occur the SIMODRIVE POSMO A elec-
tronics would detect an undervoltage condition and subsequently trip
(shut–down).
S Example 1: 3 SIMODRIVE POSMO A – 75 W
– Coincidence factor = 1
– Rated output, full speed
––> 3 S 4.5 A S 1 = 13.5 A ––> SITOP power 20 A
S Example 2: 3 SIMODRIVE POSMO A – 75 W
– Coincidence factor = 0.7 (not all drives are simultaneously oper-
ational)
– Rated output, full speed
––> 3 S 4.5 A S 0.7 = 9.45 A ––> SITOP power 10 A
S Example 3: 3 SIMODRIVE POSMO A – 300 W
– Coincidence factor = 1
– Rated output, full speed
––> 3 S 5.25 A S 1 = 15.75 A ––> SITOP power 20 A
S Example 4: 3 SIMODRIVE POSMO A – 300 W
– Coincidence factor = 0.5 (not all drives are simultaneously oper-
ational)
– Rated output, full speed
––> 3 S 5.25 A S 0.5 = 7.875 A ––> SITOP power 10 A
Coincidence factor
2 Installing and Connecting–Up
02.99