Omega Engineering LDN-PS User Manual page 22

7.0:
Applications (continued)
Volt drop V is calculated in a similar way to the previous example except there is only a single cable and 3 Orbit
1
modules. The PSIM supplies power to remaining modules and are calculated separately. The long communications
cable does not carry supply current and so has no affect on volt drops.
Calculation for V
Then approximate voltage at end of network
i.e. greater than 4.75 Vdc; the minimum working voltage.
Calculation for V
Then approximate voltage at end of network
i.e. greater than 4.75 Vdc; the minimum working voltage.
LDN-PS
volt drop = cable + module (3 off)
1
= (15.2 x 3) + 0.04(3+2+1)
= 46 mV
= nominal supply voltage - calculated volt drop
= 5.1 - 0.046
= 5.054 V
volt drop = PSIM + module (3 off)
2
= (5.3 x 3) + 0.04(3+2+1)
= 16 mV
= nominal supply voltage - calculated volt drop
= 5.1 - 0.016
= 5.084 V
21
PSIM-AC PSIM-DC PSIM-5V
M-3340/1206