Morrison Bros. co. 918AC Series Installation, Operation And Maintenance Instructions
System interface
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918AC Series System Interface
Installation, Operation, and Maintenance Instructions
The 918AC Series is designed to provide a visible and audible alarm. It is an A.C. powered device intended
to be located in an ordinary location. The 918AC Series System Interface is configurable for one to four
Intrinsically Safe, normally open or normally closed, dry contact inputs and from zero to four form C (SPDT),
dry contact outputs. The outputs may be configured as normally disengaged or normally engaged (fail-safe).
Two possible applications are use as an overfill alarm or as an interstitial alarm.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
!
liquid spill, which could result in property damage, environmental contamination, fire, explosion, serious
injury or death.
!
Le fait de ne pas se conformer à l'un ou l'autre des avertissements ou à l'une ou l'autre des directives
apparaissant dans ce document pourrait donner lieu à des déversements de liquides dangereux, lesquels
pourraient engendrer des dommages matériels, des risques de contamination environnementale,
d'incendie ou d'explosion, des blessures graves ou la mort.
Contents
Specifications .....................................................................................................................................2
Installation and Testing ......................................................................................................................3
Mounting ...................................................................................................................................... 4
Steps to Wire and Configure the System Interface ............................................................................ 5
Input Module(s) ............................................................................................................................ 5
Facilities Section of the System Interface ....................................................................................7
Output Module(s) (if so equipped) ...............................................................................................8
Completion ...................................................................................................................................10
Steps to Configure the 918AC Series System Interface Motherboard ..............................................11
Auto-Silence .................................................................................................................................11
Audible Alarm ..............................................................................................................................12
'Heartbeat' Function ...................................................................................................................... 13
Steps to Test the 918AC Series System Interface ..............................................................................14
Operation ........................................................................................................................................... 16
Use as an Overfill Alarm ..............................................................................................................16
Use as in Interstitial Alarm ...........................................................................................................16
Maintenance .....................................................................................................................................17
Monthly ........................................................................................................................................ 17
Yearly ...........................................................................................................................................18
DIP Switch Configuration Tables ......................................................................................................19
Input Module ................................................................................................................................ 19
Output Module .............................................................................................................................. 19
Motherboard ................................................................................................................................. 19
Replacement Parts ............................................................................................................................. 21
918AC System Interface Control Drawing B-7767-14 ..................................................................... 22
rev.10-20-2021
Morrison Bros. Co. - Dubuque, IA - 800-553-4840
1
918AC-0142 PP
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Summary of Contents for Morrison Bros. co. 918AC Series
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Page 1: Table Of Contents
Installation, Operation, and Maintenance Instructions The 918AC Series is designed to provide a visible and audible alarm. It is an A.C. powered device intended to be located in an ordinary location. The 918AC Series System Interface is configurable for one to four Intrinsically Safe, normally open or normally closed, dry contact inputs and from zero to four form C (SPDT), dry contact outputs. -
Page 2: Specifications
Specifications Description The 918AC Series System Interface is intended to be located in an Ordinary Location. Its inputs are intrinsically safe for use with Class I, Division 1 Group D. T4 Hazardous location with either normally open or normally closed dry contacts. -
Page 3: Installation And Testing
Installation and Testing WARNINGS • Fire Hazard – Death or serious injury could result from spilled liquids. • You must be trained to install or maintain this alarm. Stop now if you have not been trained. • Any modification of this unit beyond what is outlined in this instruction will void product warranty. •... -
Page 4: Mounting
WARNING: Interconnect wiring between the sensor(s) and the System Interface unit must be kept totally isolated and separate from any other wiring. This wiring must not share any junction box, conduit, raceway, or fixtures with circuits other than those defined by NEC as being intrinsically safe for all Class 1 locations. These inputs are ground referenced and only require “basic insulation.”... -
Page 5: Steps To Wire And Configure The System Interface
Steps to Wire and Configure the System Interface Facilities Section Figure 1 Basic Layout of the 918AC Imput Module(s) 1. Preparation a. Open the front cover of the System Interface by releasing the two cover latches and swinging the cover open. b. - Page 6 c. Verify that they are securely held in the connector by gently tugging on them. d. Plug the connector onto the Channel Input pins of the Dry Contact Input Module (see Figure 3). Figure 3 Plug the Channel Input Connector onto the Channel Input Pins of the Alarm Circuit Board e.
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Page 7: Facilities Section Of The System Interface
ii. Gently push the cover over to the wall of the enclosure and secure in place with the screws. iii. Snug the screws down. IMPORTANT NOTE: Verify that the power is shut off and the appropriate “Lockout/Tagout” (LOTO) procedure is being adhered to before attempting any power wiring. This is true for both the Power Input to the System Interface and the devices connected to the Output Modules. -
Page 8: Output Module(S) (If So Equipped)
Output Module(s) (if so equipped) NOTE: See “Output Module Contact Rating” section of the “Specifications” section of this document (on page 2, above) for the contact rating for the output modules. NOTE: The 918AC “outputs” do not provide any power of themselves; these are dry-contact switches only. Supplied power runs through them to control your devices. - Page 9 ON = Respond to this Channel’s Alarm Channel 4 Channel 3 Channel 2 OFF = Do NOT Channel 1 Respond to this Channel’s Alarm Figure 8 - Output Module Alarm Channel Configuration i. Locate the four position DIP switch, S2, on the Output Module to be configured (see Figure 8).
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Page 10: Completion
ON = Normally Activated OFF = Normally Deactivated Figure 9 - Output Module Mode Configuration i. Locate the single position DIP switch, S1, on the Output Module to be configured (see Figure 9). ii. Place this DIP switch in the “OFF” position if the output is to be configured as Normally- Deactivated. -
Page 11: Steps To Configure The 918Ac Series System Interface Motherboard
Steps to Configure the 918AC Series System Interface Motherboard Auto-Silence Select which input channels will automatically silence after a 3 minute timeout period. ON = Autosilence OFF = Autosilence Activated for Deactivated for Channel Channel Figure 10 - Motherboard Auto-Silence Configuration 1. -
Page 12: Audible Alarm
Audible Alarm Select which channels will produce an audible alarm. ON = Audible OFF = Audible Alarm Activated Alarm Silenced for Channel for Channel Figure 11 - Motherboard Buzzer Configuration 1. Locate the four position, Buzz DIP switch, SW102, on the Motherboard (see Figure 11). 2. -
Page 13: Heartbeat' Function
‘Heartbeat’ Function Enable/disable the heartbeat function. NOTE: The heartbeat function will periodically flash the indicators on the front cover of the System Interface to show observers that power is on. Any alarm condition present will override the heartbeat function. The heartbeat function is disabled in the factory by default. -
Page 14: Steps To Test The 918Ac Series System Interface
Steps to Test the 918AC Series System Interface 1. Determine which of the devices connected to the Output Module(s) need to be disconnected before beginning this test. Remove the cover over the Facilities Section and unplug these Output Channels. 2. Apply power to the System Interface. - Page 15 DO NOT PROCEED PAST THIS POINT UNTIL ALL TESTS HAVE BEEN PASSED 9. Plug in all Output Connectors to their respective Output Module(s) that were previously disconnected and reinstall the cover over the Facilities Section of the System Interface. 10. Close the enclosure and secure. 11.
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Page 16: Operation
Operation The 918AC Series System Interface may be used in applications where one to four sets of normally open or normally closed dry contacts are available. Two possible applications are use as an overfill alarm or as an interstitial alarm. These two uses are addressed below. -
Page 17: Maintenance
Maintenance WARNINGS • Fire Hazard – Death or serious injury could result from spilled liquids. • You must be trained to install or maintain this alarm. Stop now if you have not been trained. • Any modification of this unit beyond what is outlined in this instruction will void product warranty. •... -
Page 18: Yearly
b. If alarm does not sound or the Channel Alarm Indicators do not blink, verify that power is applied to the System Interface and re-test. If the alarm still does not sound replace the System Interface or call Morrison Bros. Co Customer Service. c. -
Page 19: Dip Switch Configuration Tables
DIP Switch Configuration Tables Input Module Table 1 Input Module SW1 - Normally Open/Normally Closed Contacts Setting Position Configures the input module for Configures the input module for Normally Open contacts Normally Closed contacts Output Module Table 2 Output Module S1 - Normally Activated/Deactivated Setting Position Normally Activated (failsafe) - Page 20 Table 5 Motherboard SW102 - Buzzer Channel Select Setting When this channel input is This channel is a silent channel. activated, the buzzer will sound until the Auto-Silence period The buzzer will not sound when passes (if so configured) or until this input is activated.
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Page 21: Replacement Parts
Replacement Parts Part Description Part Number 918AC Installation Operation and Maintenance Manual 918AC-0142 PP 918AC Input Module Kit 918AC-0105 AK 918AC Output Module Kit 918AC-0106 AK Buzzer 918AC-0113 2B Identification Labels 918AC-0141 2L Lens Kit, AMBER 918AC-0135 AK Lens Kit, GREEN 918AC-0134 AK Lens Kit, RED 918AC-0107 AK... -
Page 22: 918Ac System Interface Control Drawing B-7767-14
918AC System Interface Control Drawing B-7767-14 Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840 rev.10-20-2021 918AC‑0142 PP... - Page 23 918AC System Interface Control Drawing B-7767-14 Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840 rev.10-20-2021 918AC‑0142 PP...
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