Calculating the System Current Draw | Power Supply Calculations |
Table
TABLE
| Calculation Column 1 |
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| Calculation Column 2 |
| Calculation Column 3 |
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Device Type | Primary, |
| Primary, Fire Alarm Current |
| Secondary, | ||||||||||
(amps) |
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| Qty |
| X[current draw]= | Total |
| Qty | X [current draw] = | Total |
| Qty | X[current draw]= | Total | |||
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Main Circuit Board | 1 |
| X[0.122]= | 0.122 |
| 1 | X[0.185]1= | 0.185 |
| 1 | X[0.122]= | 0.122 | |||
[ | ] | X[0.001]= |
| [ | ] | X[0.001]= |
| [ | ] | X[0.001]= |
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4XTMF | [ | ] | X[0.005]= |
| [ | ] | X[0.011]1= |
| [ | ] | X[0.005]= |
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[ | ] | X[0.037]= |
| [ | ] | X[0.040]= |
| [ | ] | X[0.037]= |
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[ | ] | X[ | ]2= |
| [ | ] | X[ | ]= |
| [ | ] | X[ | ]= |
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[ | ] | X[ | ]2= |
| [ | ] | X[ | ]= |
| [ | ] | X[ | ]= |
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Power Supervision | [ | ] | X[0.025]= |
| [ | ] | X[0.025]= |
| [ | ] | X[0.025]= |
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Relays3 |
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NAC #14 |
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| [ | ] | X[ | ]= |
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NAC #2 |
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| [ | ] | X[ | ]= |
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NAC #3 |
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NAC #4 |
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Current Draw from |
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TB9 (nonalarm5) |
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Sum each column6 | Primary |
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| Primary Alarm = |
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| Secondary |
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for totals |
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Table Footnote
1.If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add another 0.005 amps.
2.Refer to the Device Compatibility Document for standby current.
3.Must use compatible listed Power Supervision Relay.
4.Current limitation of Terminal TB5 circuits is 3.0 amps per NAC
5.The total standby current must include both the resettable (TB9 Terminals 3 & 4) and nonresettable/resettable (TB9 Terminals 1 & 2) power. Caution must be taken to ensure that current drawn from these outputs during alarm does not exceed maximum rat-
ings specified. Current limitations of TB9, Terminals 1 & 2 = 0.500 amps, filtered, 24 VDC
6.Total current draw listed above cannot exceed 7.0 amps
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