Omega Engineering LDN-PS User Manual page 24

7.0:
Applications (continued)
The PSIM-5V is powering the whole Orbit Network. PSIM-5V volt drop is calculated using 12 as the total number of
Orbit modules; the RS232IM is included in this number.
Total Voltage drop = PSIM-5V + modules (6 off) + Cable 1 + Modules (6 off)
= (2 x 12 x [3+1]) + 0.04 (1+2+3+4+5+6+7+8+9+10+11+12)+ (15.2 x 6) + 0.04
= 96 + 3.12 + 91.2 + 0.84
= 191 mV
Then approximate voltage at end of network
i.e. greater than 4.75 Vdc the minimum working voltage. In this example the input supply to the PSIM-5V could be
reduced to 5.1 V (the Orbit nominal value).
LDN-PS
(1+2+3+4+5+6)
= nominal supply voltage - calculated volt drop
= 5.25 - 0.191
= 5.06 V
23
PSIM-AC PSIM-DC PSIM-5V
M-3340/1206