Safety information & use of this manual .......................................................................................................................... 5
Installation information ................................................................................................................................................ 5
Battery information ...................................................................................................................................................... 6
Product disposal at the end of its working life ............................................................................................................. 6
Locating the Voice Alarm panel ........................................................................................................................................ 7
Fixing the back box to the wall ..................................................................................................................................... 7
Recommended cable types and their limitations ......................................................................................................... 8
Wiring the PCB ................................................................................................................................................................ 10
Networking the panel ..................................................................................................................................................... 13
Connecting the EVACS 1-16 to an analogue addressable panel ..................................................................................... 15
Configuring the Voice Messages, and Trigger Inputs...................................................................................................... 17
Mic Configuration ....................................................................................................................................................... 19
Status Monitor ............................................................................................................................................................ 23
Methods of Operating the Premier EVACS 1-16 ............................................................................................................. 25
1. LIVE BROADCAST ..................................................................................................................................................... 25
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Resetting from a Voice Alarm Condition .................................................................................................................... 25
Power Supply fault .................................................................................................................................................. 26
Loss of Mains power ............................................................................................................................................... 26
Loss of Battery power ............................................................................................................................................. 26
Loss of Charger ........................................................................................................................................................ 26
System Fault ............................................................................................................................................................ 27
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Summary
The Premier EVACS 1-16 Voice evacuation control panel has been designed and developed as a standalone system
that will compliment any Zeta Fire Detection System.
The control panel is a modular design, allowing up to 16 channels, units, to be networked via RS485.
Each unit has 30 watts output divided to 2 sub-channels. Also 2x24v outputs are provided to drive alarm systems
where needed.
The Premier EVACS 1-16 configuration software lets you easily customise and program the panels features including:
volume control, trigger matrix, microphone configuration, as well as downloading of bespoke alert and evacuate
messages of up to a minute long each.
The pre-recorded message can be initiated via the built-in keypad, via the remote trigger inputs or via the loop
interface. The remote trigger inputs and the loop interface allow the EVACS 1-16 messages to be triggered by the
outputs of a fire alarm control panel / Control & Indicating Equipment (CIE).
It has an emergency (or fireman’s) microphone which can be used to broadcast live messages; each panel can be
individually configured to broadcast microphone messages either locally or system-wide.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Safety information & use of this manual
WARNING: Read this section completely before operating this equipment.
Installation information
THIS VOICE ALARM CONTROL & INDICATING EQUIPMENT (VACIE) IS CLASS-1 EQUIPMENT AND MUST BE EARTHED.
This equipment must be installed and maintained by a qualified and technically experienced person.
This VACIE must be wired to a fused spur rated at 5A. It must NOT be connected via a removable plug, or be
connected through an RCD device.
Prior to commencing installation of the control panel, ensure that adequate precautions are taken to prevent damage to the
sensitive electronic components on the display board and the control board due to electrostatic discharge. If anti-static
equipment (such as an anti-static wrist strap) is not available, you should discharge any static electricity you may have
accumulated by touching a convenient earthed object such as an unpainted copper radiator pipe. You should repeat the process
at regular intervals during the installation process, especially if you are required to walk over carpets.
The panel must be located in a clean, dry position, which is not subject to excessive shock or vibration and at least 2
metres away from pager systems or any other radio transmitting equipment.
The only items which are designed to be removed from the enclosure are the cable connectors. Ensure that all
electrical power is removed from the equipment before removing, inserting or connecting cables to these
connectors.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Battery information
This VACIE uses 2 x 12V Sealed Lead Acid (SLA) batteries with a capacity in the range of 7.2Ah to 17Ah.
CAUTION:
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO
BATTERY MANUFACTURERS INSTRUCTIONS.
IMPORTANT NOTES ON BATTERIES:
DANGER: Batteries are electrically live at all times. NEVER short circuit the battery terminals.
WARNING: Batteries are often heavy. Take great care when lifting and transporting batteries.
DANGER: Do NOT attempt to remove the battery lid or tamper with the internal workings of the battery. Electrolyte
is a highly corrosive substance, and presents significant danger to yourself and to anything else it touches. In case of
accidental skin or eye contact, flush the affected area with plenty of clean, fresh water and seek immediate medical
attention. Valve Regulated Lead Acid (VRLA) batteries are “low maintenance”, requiring no electrolyte top-up or
measurement of specific gravity.
Product disposal at the end of its working life
Like all electronic equipment, at the end of its working life this unit should not be disposed of in a
refuse bin. It should be taken to a local reprocessing site as per the guidelines of the WEEE directive,
for correct disposal.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Recommended cable types and their limitations
All wiring must be installed to meet BS5839: Pt1: 2002 + A2:2008 and BS 7671:2008 (IEE Wiring Regulations)
standards. Other National standards of fire alarm system installation should be adhered to where applicable.
Screened cables should be used throughout the installation to help shield the Panel from outside interference and
ensure EMC compatibility.
The two categories of cable according to BS5839: Pt1: 2002 + A2:2008, Clause 26 “Fire Detection and Alarm Systems
for Buildings (Code of Practice for System Design, Installation and Servicing)” are:
Standard fire resisting cable – to PH30 classification of EN 50200 (including the 30 min survival time of Annex E)
Enhanced fire resisting cable – to PH120 classification of EN 50200 (including the 120 min survival time of BS 8434-2)
(Note that all cables should be at least 1mm2 cross section
On the Premier EVACS 1-16 Panel the general recommendation would be to use standard fire resistant cable, such as
GLT Exports Fire Defence Cable, Firetuff , FP200 or an equivalent. These cables are screened, and will provide good
EMC shielding when properly grounded at the panel. Certain system specifications may demand the use of a
particular type of cable and due regard should be paid to this fact.
Depending on the environment, the cables may need mechanical protection (such as a conduit).
Mains wiring recommendations
The Mains supply to the VACIE is fixed wiring, using Fire resisting 3-core cable (Between 1 mm² and 2.5mm²), fed
from an isolating double pole switch fused spur, and fused at 5A. IT SHOULD NOT BE CONNECTED THROUGH AN RCD. This should be secure from unauthorised operation and be marked ‘FIRE ALARM: DO NOT SWITCH OFF’. The
supply must be exclusive to the Fire Panel. MAKE SURE ANY SPARE ENTRY HOLES ARE COVERED WITH THE GROMMETS PROVIDED
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Mounting the voice evacuation panel
The Premier EVACS 1-16 comes with many cable entry holes. If another entry hole is required, it is strongly
recommended that the panel door is removed to avoid accidental damage. Also the PCB assemblies should be
removed and stored in a safe place. This would also help while fixing the back box to the wall.
Planning cable entry
The figure below shows the location of the cable entries to facilitate planning of wiring to be brought to the panel.
If a cable-entry push-out is removed, fill the hole with a brass cable gland. If any knockout is removed, but
subsequently not used, it should be covered up using a 20mm blanking grommet.
The 230V AC Mains cable must be fed into the enclosure via one
of the cable entries at the top right corner of the back box. This
cable must be connected to the mains terminals of the power
supply, which are marked L, N, (Live, Neutral, Earth)
Take care not to damage the VACIE during installation.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Connection
Description
Display
Connect to display PCB of the
EVACS
1-16
Wiring the PCB
The following connectors are available on the PCB:
Loop input Allows connection to an analogue control panel such as the Premier Quatro
Fault relay Connection to the fault relay, this is normally energised when the system is
functioning correctly.
Alert Trigger input for the Alert signal
Evacuate Trigger input for the Evacuate signal
Aux Auxiliary power output
Network Network connection to other EVACS 1-16 panels
Microphone input Connects to the panels microphone
Channel 1 / 2 speaker output Speaker output
Sounder 1 / 2 output Conventional sounder output
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Controls
The Premier EVACS 1-16 has the following controls:-
LABEL USE
TEST LED and buzzer test
ALARM Used to initiate manual playback of the Evac / Alarm Message
ALERT Used to initiate manual playback of the Alert Message
DISABLE Used to disable one or more of the speaker channels
SILENCE Used to silence the panels fault buzzer
RESET Used to reset the system from the voice alarm condition
STOP / START Used to Manually start playback of a selected message, or to stop an
existing message.
1 - 16 Select buttons for channels 1 to 16
Speaker circuits
The EVACS 1-16 has two 667Ω speaker outputs running at 100v nominal allowing up to 30W RMS output per channel
Wiring the speakers
Te premier EVACS II checks for line integrity by using a 10K End of Line resistor on each speaker circuit, which should
be connected to the last speaker on the circuit. The end-of-line resistor should be rated at 1W or higher
Sounder circuits
The EVACS 1-16 has two sounder outputs that activate alongside the speaker outputs; they are each rated at 500mA
at 28V DC (nominal) and are over-current protected by a self-resetting fuse. The sounder circuits are monitored and
require a 10K End of line resistor rated at 1/8w or higher.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Networking the panel
The EVACS 1-16 allows up to 16 panels to be connected over RS485 network interface, with each panel, or module,
acting as a 2-channel zone. Individual panels or zones can then be controlled by the master panel.
The network address can be set using switches 1-4 of the DIP switch located on the amplifier board. The master
panel or a panel which is not part of a network must be set an address of 1.
Address SW1 SW2 SW3 SW4
1 (Master, or stand-alone panel) OFF OFF OFF OFF
2 OFF OFF OFF ON
3 OFF OFF ON OFF
4 OFF OFF ON ON
5 OFF ON OFF OFF
6 OFF ON OFF ON
7 OFF ON ON OFF
8 OFF ON ON ON
9 ON OFF OFF OFF
10 ON OFF OFF ON
11 ON OFF ON OFF
12 ON OFF ON ON
13 ON ON OFF OFF
14 ON ON OFF ON
15 ON ON ON OFF
16 ON ON ON ON
The network connection terminals are labelled COMA, 0V and COMB. Each should be wired to the corresponding
terminal of the next panel on the network. The panels themselves do not need to be wired in any particular order
with regard to the address used.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
SWITCH
ON
OFF Notes
SW5
RESERVED
RESERVED
RESERVED
– SET TO ‘OFF’
SW6
RESERVED
RESERVED
RESERVED
– SET TO ‘OFF’
SW7
Master Alarm
Local Alarm
SW8
Local
microphone
Broadcast microphone
The master panel must be configured with the number of zones on the network (that is, the number of EVACS 1-16
panels, including the master panel). This is done with the EVACS 1-16 configuration software via the USB link.
To set the number of zones, connect the PC to the EVACS 1-16 panel via a suitable USB cable and run the EVACS 1-16
configuration software. Note that the panel must be powered on.
In the configuration software, select settings, select the desired number of zones and click OK.
The panel should now be configured with the correct number of zones.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Switch
Address
SW1
+128
SW2
+64
SW3
+32
SW4
+16
SW5
+8
SW6
+4
SW7
+2
SW8
+1
Connecting the EVACS 1-16 to an analogue addressable panel
The EVACS 1-16 allows connection to an analogue addressable panel via the loop interface. In a network of multiple
EVACS 1-16 panels, the CIE must be connected to the master panel.
The EVACS 1-16 utilises the Fyreye MKII protocol and must be connected to a panel running the MKII software.
The device address of the EVACS 1-16 is set by the 8-way dip switch located on the display PCB,
value
the address is set in binary notation, with switch 1 being the most significant bit (MSB) and
switch 8 being the least significant bit (LSB). Refer to the table on the left for a list of each
switch value, or the tables on the following pages for a quick reference of all addresses. Note
that address 0 is reserved and should not be used.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Configuring the Voice Messages, and Trigger Inputs
The EVACS 1-16 panel can be configured using the EVACS software. To configure the software the panel must be
powered on and plugged into the PC running the software using a suitable USB connector.
For the EVACS 1-16 the drop-down list box in the centre of the dialogue should be set to EVACS 1-16.
For networked EVACS 1-16 panels, most settings are only available to the panel configured as master.
On the Premier EVACS 1-16, alert and evacuation messages can be uploaded from a PC running the configuration
software. The messages cannot be recorded direct to the panel due to the microphones limited dynamic range,
which would result in poor quality pre-recorded messages.
Any suitable Audio file can be uploaded. The file format is *.wav format, 16-bit, 1 channel (mono), uncompressed
16,000 samples/sec (256kbps) with a maximum length of 55 seconds
A custom message can be recorded on a PC or in a sound studio if the best sound clarity is required. Alternatively,
you can use one of the sample messages provided with the PC Configuration Software.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Alarm Configuration
The alarm configuration dialogue allows the user to upload a custom alarm message, it also allows the user to set
the alarm tone used, which is a short tone intended to grab people’s attention before the alarm messages is played.
The Readback button on this dialog, as well as the other audio-file configuration dialogs will read the audio file
configuration from the EVACS 1-16 and display it on screen:
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Alert Configuration
This dialog allows the setting of the Alert message and pre-alert tone.
Microphone Configuration
The microphone signon/signoff dialog allows the customisation of the sign-on and sign-off tones, these are short
tones or custom announcements that are played when the microphone is activated and de-activated respectively.
Batch-Load Audio Files
A batch-load option is available for the convenience of vendors who may work on multiple EVACS 1-16 systems
utilising the same custom set of audio files.
[Alert] section: Specifies the message and tone to be played for zones in the ALERT status
[Evac] section: Specifies the message and tone to be played for zones in the EVACUATE status
[Mic] section: Specifies the audio files to be played for the sign-on and sign-off for the microphone
[Comms] section: specifies the communications parameters. The communications port the EVACS 1-16 panel is
detected on should be displayed in the lower left of the EVACS software main screen.
List of available tones
start frequency
(Hz)
end frequency
(Hz)
duration
(mS)
or f1 time
(mS)
or f2 time
(mS)
Note: All times are in milliseconds (mS), where 1000mS = 1 second.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Trigger Matrix
The trigger matrix tells the panel what to do in the event that the alarm is triggered in a particular zone via the alarm
trigger input.
In this example the zone activated will go into alarm, whilst all other zones will go into alert; however it is possible to
set a variety of configurations using this interface. When you are happy with the configuration, be sure to click on
the [Send] button to upload the trigger matrix to the panel.
Settings
From here you can set the number of zones configured on a network. Select ‘1’ for a standalone system. Each EVACS
1-16 connected to the network is counted as one zone.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Firmware Update
Shows the version of the currently loaded firmware, and provides a utility to update the firmware image:
WARNING: firmware updates should NOT be attempted unless under the specific instruction of the manufacturer.
An incorrect firmware update may cause the panel to operate outside its design and conformity specifications,
and may even cause permanent damage to the panel.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Methods of Operating the Premier EVACS 1-16
The Premier EVACS 1-16 can operate in any one of the following ways:-
1. LIVE BROADCAST
The microphone is used to broadcast information about the alarm, and the responsible person would direct
occupants what to do next. The Microphone broadcasts to all non-disabled channels.
2. PRE-RECORDED MESSAGE (MANUAL)
The Operator can select to play the pre recorded Evacuation or alert message to individual zones. The message(s)
are only played to the selected zones.
3. PRE-RECORDED MESSAGE (AUTOMATIC)
Some or all of the Premier EVACS 1-16`s remote trigger inputs will be connected to I/O units in a fire panel. The
panel will operate the I/O relays to link the relevant trigger to 0V. There are inputs for Evac on all zones, Alert on all
zones, and an individual input for each zone, which can be configured via the PC Software. Sample configurations
are:-
Play evac / alarm on selected zone
Play evac / alarm on selected zone, and alert on all other zones
As shown above, the number of zones operated will depend on the configuration of the remote inputs.
Play evac / alarm on selected zone, and alert on floor above & floor below
Resetting from a Voice Alarm Condition
The EVACS 1-16 can be reset in various ways, depending on how the Voice alarm condition was initiated.
If the microphone is used for a live broadcast, simply releasing the microphone will return the EVACS 1-16 to its
normal condition.
If a pre-recorded message was started manually, it will need to be reset from the Voice Alarm Panel. Press Start/Stop
to stop playing the message, then press reset to return the EVACS 1-16 to its normal condition.
If a pre-recorded message was started automatically by a fire alarm panel, resetting the fire alarm panel will reset
the Voice alarm panel automatically. Alternatively, the message can be stopped by pressing Stop/Start on the Voice
alarm Panel. (Note if reset is then pressed, and the triggering signal is still active, the EVACS 1-16 will return to the
voice alarm condition.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Fault display & fault-finding
The Premier EVACS 1-16 panel monitor for the following faults:-
Power Supply Fault
Speaker Channel open-circuit wiring fault
Speaker Channel short-circuit wiring fault
Earth Fault
Amplifier Fault
System Fault
The Premier EVACS 1-16 Voice Alarm panel also has a General Fault LED that will light when any fault is present.
Most of these faults will need to be checked by an engineer.
All faults in the Premier EVACS 1-16 are NON-LATCHING. IE they cannot be reset with the reset button. They will
clear automatically when the fault has been fixed.
Fault Finding
Power Supply fault
A power supply fault is indicative of one or more of the following faults: -
Loss of Mains power
Check that 230V AC is present at the mains terminal block
Check mains fuse
Check charger fuse FS1.
Loss of Battery power
Check that 2 X 12V batteries are fitted in series to give 24V backup
Check battery fuse
Check that battery connections are secure.
Check that the batteries are not over 5 years old
Loss of Charger
The Power supply will monitor the charger circuit. In the rare event of a component failure that affects the charger,
the PSU will bring up a fault.
Loss of Battery Capacity
The Power supply will monitor the Battery condition. If it detects a high internal resistance, which usually means a
loss of capacity in the battery, it will bring up a fault.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Speaker Circuit Fault
A Speaker Circuit Fault is indicative of one or more of the following faults:-
Speaker Circuit Open Circuit fault.
Check that there are no breaks in the cable, and that all screw connections are secure.
As a panel check, disconnect the circuit indicating the fault, and press the calibrate button. If the fault clears, the
panel is working correctly.
Speaker Circuit Short Circuit Fault
Check that all speakers are fitted the correct way round.
Check than no other devices have been connected to the speaker circuit.
Check for shorts to the cable screen.
As a panel check, disconnect the circuit indicating the fault, and press the calibrate button. If the fault clears, the
panel is working correctly.
Speaker Failure
Because the Premier EVACS 1-16 monitors the speaker circuits for a change in impedance, the system can usually
detect a broken speaker. For example a broken wire to the drive cone will not affect the speaker line`s continuity,
but it will affect its impedance.
Presently, the only way to check for this is by verifying sound output at each speaker on the speaker circuit reporting
the fault.
Earth Fault
The Premier EVACS 1-16 monitors it`s cabling for short circuits to earth. In the event of an earth fault, disconnect the
speaker circuits one at a time to locate the one giving a problem.
Amp Fault
The Premier EVACS 1-16 monitors Amplifiers for correct operation. If one of its power amplifiers reports a fault, the
EVACS 1-16 will report it. Try resetting the panel to clear the fault. If the fault persists, contact your dealer.
System Fault
The Premier EVACS 1-16 monitors its internal software for correct operation. If it detects a possible problem, the
EVACS 1-16 will report it. Try resetting the panel to clear the fault. If the fault persists, contact your dealer.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Battery calculation
As a general rule the battery selected as a backup power source for the panel should be calculated to provide at
least 24 hours of standby power, plus 30 minutes power in the alarm condition plus a 25% reserve to account for
battery life degradation, environmental factors or unexpected power drains.
When calculating the backup power requirements for the audio system it is important to note that the relationship
between output power, volume and power drain is non-linear, and may differ depending on the message store used.
The following graph shows the typical current drawn by a single audio channel based on the output power
Single channel current draw
3.5
3.0
2.5
1KHz continuous sine wave
2.0
1.5
1.0
Current Draw (A)
0.5
0.0
01020304050
Output power (W)
Standby current will consist of the quiescent current draw of the panel, plus the current draw of any equipment
connected to the aux power output.
Alarm current will consist of: the alarm current of the panel plus the current draw of any equipment plus the current
draw by the audio amplifiers
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Standby requirements
Quiescent current
0.06A
Auxiliary equipment
0.1A
Total standby
current
0.16A
x standby time of:
24h = 3.84
Ah
(1)
Alarm requirements
(2)
Total capacity requirements
(1)
(2)
(3)
Consider a system consisting of:
1x 12W speaker system
1x 8W speaker system
100mA equipment draw on Aux power
300mA equipment draw on Aux power during alarm
480mA sounder channel 1
360mA sounder channel 2
- The system must remain on standby for 24 hours
- The system must also be able to handle the alarm condition for a minimum of 1 hour
Referring to the audio output power graph –
The 12W speaker system will have a maximum current draw of about 1.4A
The 8W speaker system will have a maximum current draw of about 1.1A
System current 0.5 A
Auxiliary equipment 0.3 A
Sounder circuit 1 0.48 A
Sounder circuit 2 0.36 A
Audio channel 1 1.4 A
Audio channel 2 1.1 A
Total Alarm current 4.14 A
(1)
Sum of
(2)
and
=
Minimum battery capacity =
x alarm time of:
3.84 Ah +
7.98 Ah
1 h = 4.14 Ah
4.14 Ah = 7.98 Ah
x 1.25 = 9.975 Ah
The next battery capacity upwards from this is 12Ah, which would be suitable for this installation.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Audio Power
The following graphs demonstrate typical performance characteristics for the Evacs 1-16.
The test panel was configured in standalone mode and audio output was set as a 1 KHz sine wave with each speaker
output played into a 575Ω impedance load (1230Ω resistive, 110nF capacitive).
Test measurements are intended as a guide only as actual power throughput will differ depending on the audio
played, and may push the system beyond its recommended operating parameters.
Volume controls
Please note that maximum output of the unit is indicative only and that setting the unit beyond the maximum
recommended ratings may degrade audio performance. Actual output power will vary depending on the speaker
system installed.
PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Power consumption
These graphs show typical power consumption characteristics from both a main power source and a backup power
source. The power consumption data includes a small overhead of roughly 300mA drawn by the system.