DIGIPLEX SERIES
CALCULATING POWER REQUIREMENTS FOR THE SYSTEM
STEP 1: Using the Table 1 calculate the total number of power units (PU) required by each device, module, and accessory in the system.
Please take into account devices connected to the control panel’s PGM outputs. Since the BELL output has its own power supply,
do not include the sirens connected to it in the calculation.
STEP 2: If the value recorded in box “A” is less than the value derived from box “B”, go to step 3. If the value is greater, you will require an external
power supply (see ) to provide the additional power needed. Proceed with step 3 and refer to the example in .
STEP 3: Due to the degradation of a power signal over long distances, EACH length or run of wire in the system can support only a specific
number of power units (PU). Using Table 2, determine how many power units each length of wire can support. Please note that
the total number of power units (PU) can never surpass the value derived from box “B”.
Table 1: Power Unit Consumption Table
Description QTY. PU used by each Total PU
LCD Keypads (DGP-641): _______ X 80PU = __________ PU
Access Control LCD Keypads (DGP-641ACC): _______ X 150PU = __________ PU
LED Keypads (DGP-610/620/648): _______ X 45PU = __________ PU
Bus Detectors (DGP-25/60/70): _______ X 25PU = __________ PU
ZX1 Zone Expansion Modules (DGP-ZX1) _______ X 25PU = __________ PU
ZX8 Zone Expansion Modules (DGP-ZX8) _______ X 40PU = __________ PU
Liberator Wireless Modules (DGP-319): _______ X 70PU = __________ PU
PGM1 Expansion Module (DGP-PGM1): _______ X 25PU = __________ PU
Other devices such as hardwired motion detectors (1mA = 1PU) __________ PU
GRAND TOTAL A: __________ PU
B: Maximum available power units = 700PU
Table 2: Power Unit (PU) Limitations For Each Run of Wire
Gauge: 18AWG, Surface: 0.823mm
2
Gauge: 22AWG, Surface: 0.326mm
2
Gauge: 24AWG, Surface: 0.205mm
2
Length of each
run of wire
Available Power
Units (PU)
Length of each
run of wire
Available Power
Units (PU)
Length of each
run of wire
Available Power
Units (PU)
100ft. (30m) 700 100ft. (30m) 700 100ft. (30m) 700
200ft. (61m) 700 200ft. (61m) 682 200ft. (61m) 429
300ft. (91m) 700 300ft. (91m) 454 300ft. (91m) 286
400ft. (122m) 700 400ft. (122m) 341 400ft. (122m) 214
500ft. (152m) 690 500ft. (152m) 273 500ft. (152m) 171
600ft. (183m) 575 600ft. (183m) 227 600ft. (183m) 143
700ft. (213m) 493 700ft. (213m) 195
800ft. (244m) 431 800ft. (244m) 170
900ft. (383m) 383 900ft. (383m) 151
1000ft. (305m) 345 1000ft. (305m) 136
1500ft. (457m) 230
2000ft. (610m) 172
2500ft. (762m) 138
3000ft. (914m) 115
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