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

Page 45

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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Contents MS-2 & MS-4 MS-2E & MS-4E Fire Alarm System Limitations Installation Precautions MS-2/MS-4 PN 51512E 01/18/05 Table of Contents Operating Instructions Power Supply CalculationsUnderwriters Laboratories Documents for Reference OtherFireLite Documents MS-2E Main Circuit Board J8 Battery Connector Supervised, nonpower-limitedSupv. Relay TB7 2A @ 30 VAC nonsupervised MS-4E Main Circuit BoardProduct Description Product FeaturesProduct Features Product Description Specifications Controls and Indicators LED IndicatorsFront Panel Membrane Buttons Components CircuitsOptional Modules and Accessories 411UD Digital Alarm Communicator/Transmitter Battery BoxBackbox Mounting Backbox Mounting DimensionsBackbox and Battery Box Operating Power Primary Power Source AC and Earth Ground ConnectionsSecondary Power Source Batteries IDC Connections Input CircuitsStyle B Combination Circuit on Zone 2 of the MS-4 Combination Waterflow/Supervisory ZoneNotification Appliance Circuits Output CircuitsSpecial Application DC Power Output Connections Relays+ + Typical UL Power-limited Wiring Requirements Power-limited Wiring RequirementsInstallation Installation of Optional ModulesJ1 Connector CAC-4 Class a Converter Module MS-4 only11 Wiring NACs and IDCs for Class a Operation Wiring NACs and IDCs for Class a12 4X Option Module Connection to MS-4 2 4XTMF, 4XLMF and 4XZMF Option Modules13 4XTMF Transmitter Module 2.1 4XTMF Transmitter Module Installation14 4XZMF Zone Relay Module 2.2 4XZMF Zone Relay Module MS-4 only15 4XLMF LED Interface Module 2.3 4XLMF LED Interface Module MS-4 onlyProgram Options via DIP Switch MS-2 DIP Switch Settings DIP Switch SettingsMS-4 DIP Switch Settings 1 SW1 DIP Switch Settings 2.1 IDC1 Verification MS-4 only 2 SW2 DIP Switch Settings2.2 IDC1 Supervisory MS-4 only 2.4 IDC1 Supervisory for MS-2 or IDC2 Supervisory for MS-43 SW3 DIP Switch Settings Maximum Number of Strobes for Synchronization Strobe SynchronizationNonsilenceable Waterflow for Combination Circuit SparesZone Enable/Disable Switch Functions in Normal ModeReset/Lamp Test ACK AcknowledgeWalktest WalktestAudible Walktest Status LEDs Operation Fire Alarm Restoral Fire Alarm ResponseSystem Supervisory Condition Response System Supervisory Restoral ResponseTrouble Condition Restoral Trouble Condition Response1120 VAC Branch Circuit Requirements Power Supply Calculations2Converting to Full Amperes Calculating the System Current Draw3System Current Draw Calculations Calculating the System Current Draw4Total Secondary Power Requirements at 24 VDC Calculating the Battery SizeMS-2/MS-4 PN 51512E 01/18/05 Numerics IndexJP2 Fail-safeIndex Verification MS-2/MS-4 PN 51512E 01/18/05 MS-2/MS-4 PN 51512E 01/18/05 Limited Warranty

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.

One of the standout features of the Honeywell MS-2 is its dual-loop architecture. This allows for the connection of two loop circuits, each capable of supporting a wide range of devices such as smoke detectors, heat detectors, and manual pull stations. This flexibility in device connectivity enables tailored solutions based on specific building requirements, ensuring maximum safety and compliance with fire codes.

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.

In terms of technology, the MS-2 is built upon a robust digital platform that ensures precise detection and response times. With advanced signal processing capabilities, the system can differentiate between actual fire signals and nuisance alarms, thereby minimizing false alarms. This not only enhances safety but also reduces unnecessary disruptions and maintenance costs.

The MS-2 also supports addressable technology, enabling precise identification of device locations within the system. This is particularly beneficial in emergency situations where rapid response is critical. Furthermore, the panel can facilitate remote monitoring, allowing for real-time data access and integration with building management systems, thereby enhancing overall operational efficiency.

Another noteworthy characteristic of the Honeywell MS-2 is its compliance with various industry standards, ensuring that it meets the stringent requirements of fire safety regulations. The system is compatible with a wide range of Honeywell's fire alarm devices, offering versatility and scalability for future expansions.

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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