Power Supply Calculations

 

 

 

 

 

 

 

Calculating the System Current Draw

 

 

 

Table 5-3

contains three columns for calculating current draws. For each column,

 

 

 

 

calculate the current and enter the total (in amperes) in the bottom row. When finished,

 

 

 

copy the totals from Calculation Column 2 and Calculation Column 3 to Table 5-4 on

 

 

 

page 47.

 

 

 

 

 

 

 

 

 

 

 

TABLE 5-3:System Current Draw Calculations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Calculation Column 1

 

 

Calculation Column 2

 

 

Calculation Column 3

 

 

Device Type

Primary, Non-Fire Alarm Current

 

Primary, Fire Alarm Current

 

Secondary, Non-Fire Alarm Current

(amps)

 

 

 

 

(amps)

 

 

 

(amps)

 

 

 

 

Qty

 

X[current draw]=

Total

 

Qty

X [current draw] =

Total

Qty

X[current draw]=

Total

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main Circuit Board

 

 

 

 

 

 

 

X[0.112]1=

 

 

X[0.080]=

 

MS-2

1

 

X[0.080]=

0.

 

1

0.

1

0.

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X[0.085]=

 

MS-4

 

 

X[0.085]=

 

 

 

X[0.175]1=

 

 

 

CAC-4

[

]

X[0.001]=

 

[

]

X[0.001]=

 

 

X[0.001]=

 

 

 

 

 

 

 

 

 

 

 

 

 

4XTMF

[

]

X[0.005]=

 

[

]

X[0.011]1=

 

 

X[0.005]=

 

4XZMF

[

]

X[0.004]=

 

[

]

X[0.008]=

 

 

X[0.004]=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4XLMF/RZA-4XF pair

[

]

X[0.004]=

 

[

]

X[0.019]=

 

 

X[0.004]=

 

1 pair max.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-wire Detector Heads

[

]

X[

]2=

 

[

]

X[

]=

 

 

X[

]=

 

4-wire Detector Heads

[

]

X[

]3=

 

[

]

X[

]=

 

 

X[

]=

 

Power Supervision

[

]

X[0.025]=

 

[

]

X[0.025]=

 

 

X[0.025]=

 

Relays4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NAC #15

 

 

 

 

 

[

]

X[

]=

 

 

 

 

 

NAC #2

 

 

 

 

 

[

]

X[

]=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current Draw from

 

 

[

]=

 

 

 

[

]=

 

 

[

]=

 

TB1 (nonalarm6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sum each column7 for

Primary Non-Alarm =

 

 

Primary Alarm =

 

 

Secondary Alarm =

 

 

totals

 

 

 

 

 

 

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.Refer to the Device Compatibility Document for standby current.

4.Must use compatible listed Power Supervision Relay.

5.Current limitation of Terminal TB2 circuits is 2.50 amps per NAC (MS-4 requires optional transformer for max. current)

6.The total standby current must include both the resettable (TB1 Terminals 3 & 4) and nonresettable for MS-4 only (TB1 Termi- nals 1 & 2) power. Caution must be taken to ensure that current drawn from these outputs during alarm does not exceed maxi- mum ratings specified. Current limitations of TB1, Terminals 1 & 2 = 0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10 mVRMS, nonresettable power and TB1, Terminals 3 & 4 = 0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10mVRMS, resettable power.

7.Total current draw listed above cannot exceed 3.0 amps with only standard transformer installed or, for the MS-4, 6.0 amps with both the standard and optional transformers installed.

46

MS-2/MS-4 PN 51512:E 01/18/05

Page 46
Image 46
Honeywell MS-2 manual Calculating the System Current Draw, 3System Current Draw Calculations

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