Omega Vehicle Security LDN-PS - Manual (Page 22)

PSIM-AC PSIM-DC PSIM-5V
7.0:
Applications (continued)
Volt drop V
1
is calculated in a similar way to the previous example except there is only a single cable and 3 Orbit
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
1
volt drop = cable + module (3 off)
= (15.2 x 3) + 0.04(3+2+1)
= 46 mV
Then approximate voltage at end of network = nominal supply voltage - calculated volt drop
= 5.1 - 0.046
= 5.054 V
i.e. greater than 4.75 Vdc; the minimum working voltage.
Calculation for V
2
volt drop = PSIM + module (3 off)
= (5.3 x 3) + 0.04(3+2+1)
= 16 mV
Then approximate voltage at end of network = nominal supply voltage - calculated volt drop
= 5.1 - 0.016
= 5.084 V
i.e. greater than 4.75 Vdc; the minimum working voltage.
LDN-PS
21
M-3340/1206