DIGIPLEX CONTROL PANEL 9
3.8 CALCULATING POWER REQUIREMENTS
STEP 1: Using Table1: Power Unit Consumption Table, 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 in box “B”, go to step 3. If the value is greater, you will require an
external power supply (see Figure 3-5 on page 10) to provide the additional power needed. Proceed with step 3 and
refer to the example in Figure 3-4 on page 10.
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 Table2: Power Unit (PU) Limitations For Each Run of Wire,
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 in 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 Bus Modules (DGP-ZX1) _______ X 25PU = __________ PU
ZX8 Zone Expansion Bus Modules (DGP-ZX8) _______ X 40PU = __________ PU
Liberator Wireless Bus Modules (DGP-319): _______ X 70PU = __________ PU
PGM1 Expansion Bus Module (DGP-PGM1): _______ X 25PU = __________ PU
Printer Module (PRT1) _______ X 40PU = __________ 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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