Honeywell MS-2 manual Power Supply Calculations, VAC Branch Circuit Requirements

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Power Supply Calculations

Overview

SECTION 5

Power Supply Calculations

5.1Overview

This section contains instructions and tables for calculating power supply currents in alarm and standby conditions. This is a four-step process, consisting of the following:

1.Calculating the total amount of AC branch circuit current required to operate the system

2.Calculating the power supply load current for non-fire and fire alarm conditions and calculating the secondary (battery) load

3.Calculating the size of batteries required to support the system if an AC power loss occurs

4.Selecting the proper batteries for your system

5.2Calculating the AC Branch Circuit

The control panel requires connection to a separate, dedicated AC branch circuit, which must be labeled FIRE ALARM. This branch circuit must connect to the line side of the main power feed of the protected premises. No other non-fire alarm equipment may be powered from the fire alarm branch circuit. The branch circuit wire must run contin- uously, without any disconnect devices, from the power source to the control panel. Overcurrent protection for this circuit must comply with Article 760 of the National Electrical Codes as well as local codes. Use 14 AWG (2.00 mm2) wire with 600 volt insulation for this branch circuit.

Use Table 5-1 , to determine the total amount of current, in AC amperes (A), that must be supplied to the system.

TABLE 5-1:120 VAC Branch Circuit Requirements

Device Type

Number of

 

Current Draw

 

Total Current

Devices

 

(AC amps)

 

per Device

 

 

 

 

 

 

 

 

 

 

 

MS-2/MS-4

 

 

 

 

2.3

 

 

or

 

1

X

 

 

=

 

MS-2E/MS-4E

 

 

 

 

1.15

 

 

 

 

 

 

 

 

 

 

 

[

]

X

 

 

=

 

 

 

 

 

 

 

 

 

 

[

]

X

[

]

=

 

 

 

 

 

 

Sum Column for AC Branch Current Required

=

 

 

 

 

 

 

 

 

 

44

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

Image 44
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 Power Supply Calculations Operating InstructionsFireLite Documents Underwriters Laboratories Documents for ReferenceOther J8 Battery Connector Supervised, nonpower-limited MS-2E Main Circuit BoardMS-4E Main Circuit Board Supv. Relay TB7 2A @ 30 VAC nonsupervisedProduct Features Product DescriptionProduct Features Product Description Specifications Front Panel Membrane Buttons Controls and IndicatorsLED Indicators Circuits ComponentsOptional Modules and Accessories Battery Box 411UD Digital Alarm Communicator/TransmitterBackbox Mounting Dimensions Backbox MountingBackbox and Battery Box Secondary Power Source Batteries Operating PowerPrimary Power Source AC and Earth Ground Connections Input Circuits IDC ConnectionsCombination Waterflow/Supervisory Zone Style B Combination Circuit on Zone 2 of the MS-4Output Circuits Notification Appliance Circuits+ + Special Application DC Power Output ConnectionsRelays Power-limited Wiring Requirements Typical UL Power-limited Wiring RequirementsInstallation of Optional Modules InstallationJ1 Connector CAC-4 Class a Converter Module MS-4 onlyWiring NACs and IDCs for Class a 11 Wiring NACs and IDCs for Class a Operation2 4XTMF, 4XLMF and 4XZMF Option Modules 12 4X Option Module Connection to MS-42.1 4XTMF Transmitter Module Installation 13 4XTMF Transmitter Module2.2 4XZMF Zone Relay Module MS-4 only 14 4XZMF Zone Relay Module2.3 4XLMF LED Interface Module MS-4 only 15 4XLMF LED Interface ModuleProgram Options via DIP Switch DIP Switch Settings MS-2 DIP Switch SettingsMS-4 DIP Switch Settings 1 SW1 DIP Switch Settings 2 SW2 DIP Switch Settings 2.1 IDC1 Verification MS-4 only2.2 IDC1 Supervisory MS-4 only 2.4 IDC1 Supervisory for MS-2 or IDC2 Supervisory for MS-43 SW3 DIP Switch Settings Strobe Synchronization Maximum Number of Strobes for SynchronizationNonsilenceable Waterflow for Combination Circuit SparesSwitch Functions in Normal Mode Zone Enable/DisableReset/Lamp Test ACK AcknowledgeAudible Walktest WalktestWalktest Status LEDs Operation Fire Alarm Response Fire Alarm RestoralSystem Supervisory Condition Response System Supervisory Restoral ResponseTrouble Condition Response Trouble Condition RestoralPower Supply Calculations 1120 VAC Branch Circuit RequirementsCalculating the System Current Draw 2Converting to Full AmperesCalculating the System Current Draw 3System Current Draw CalculationsCalculating the Battery Size 4Total Secondary Power Requirements at 24 VDCMS-2/MS-4 PN 51512E 01/18/05 Index NumericsFail-safe JP2Index 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.