Calculating the System Current Draw

Power Supply Calculations

5.3Calculating the System Current Draw

5.3.1 Overview

The control panel must be able to power all internal and external devices continuously during the non-fire alarm condition. To calculate the non-fire alarm load on the system power supply when primary power is applied, use Calculation Column 1 in Table 5-3 on page 46. The control panel must support a larger load current during a fire alarm condition. To calculate the fire alarm load on the power supply, use Calculation Col- umn 2 in Table 5-3 on page 46. The secondary power source (batteries) must be able to power the system during a primary power loss. To calculate the non-fire alarm load on the secondary power source, use Calculation Column 3 in Table 5-3 on page 46.

When calculating current draw and the battery size, note the following:

•‘Primary’ refers to the main power source for the control panel

•‘Secondary’ refers to the control panel’s backup batteries

•All currents are given in amperes (A). Table 5-2 shows how to convert milliam- peres and microamperes to full amperes.

TABLE 5-2:Converting to Full Amperes

To convert...

Multiply

Example

 

 

 

 

 

Milliamperes (mA) to

mA x 0.001

3 mA x 0.001 = 0.003A

 

amperes (A)

 

 

 

 

 

 

 

 

Microamperes (µA) to

µA x 0.000001

300 µA x 0.000001 = 0.0003 A

 

amperes (A)

 

 

 

 

 

 

 

 

5.3.2 How to Use Table 5-3 on page 46 to Calculate System Current Draw

Use Table 5-3 on page 46 to calculate current draws as follows:

1.Enter the quantity of devices in all three columns

2.Enter the current draw where required. Refer to the Fire-Lite Device Compati- bility Document for compatible devices and their current draw

3.Calculate the current draws for each in all columns

4.Sum the total current for each column

5.Copy the totals from Column 2 and Column 3 to Table 5-4 on page 47

Following are the types of current that can be entered into Table 5-3 on page 46:

Calculation Column 1 - The primary supply current load that the control panel must support during a non-fire alarm condition, with AC power applied.

Calculation Column 2 - The primary supply current load that the control panel must support during a fire alarm condition, with AC power applied.

Calculation Column 3 - The standby current drawn from the batteries in a non-fire alarm condition during a loss of AC power.

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

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Honeywell MS-2 manual Calculating the System Current Draw, 2Converting to Full Amperes
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MS-2 specifications

The Honeywell MS-2 is a sophisticated control panel designed for fire alarm detection systems. It is renowned for its reliability, efficiency, and advanced features which make it a popular choice among industry professionals. The MS-2 is especially well-suited for small to medium-sized commercial buildings, providing comprehensive fire detection and alarm capabilities.

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The MS-2 incorporates a user-friendly graphical interface that simplifies operation and monitoring. This LCD display provides real-time system status updates, which allows users to quickly identify any issues or alarms. Moreover, it features intuitive navigation buttons, making it easy for operators to interact with system functionalities.

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In conclusion, the Honeywell MS-2 fire alarm control panel combines advanced technology, user-friendly design, and robust features to deliver reliable fire safety solutions. Its dual-loop capability, addressable technology, and real-time monitoring make it an ideal choice for businesses aiming to enhance their fire safety infrastructure. By choosing the MS-2, organizations can better protect their assets, ensure compliance, and safeguard the lives of occupants.
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