26 EVS Series Manual — P/N LS10062-001SK-E:D 3/15/2022
EVS Device Installation Installing the EVS-INT50W
Connect the VBUS from the EVS-VCM to the EVS-INT50W amplifiers as shown in Figure 4.22
4.4.4 Setting the Device Address
Use the onboard DIP switches to select an ID number for the EVS-INT50W. Refer to Figure 4.58 on page 49 to set the DIP switches for the
desired ID number.
Once the ID number is set, add the EVS-INT50W to the system through programming.
4.4.5 Speaker Wiring
Each EVS-INT50W supplies one circuit for speaker connection. The speaker circuit can be supervised and wired Class B or Class A. The
speaker circuit is capable of 50 watts of power at 25 Vrms or 70.7 Vrms. See Section 4.3.5 for wire lengths.
4.4.6 Calculating Current Draw and Standby Battery
This section helps to determine the current draw and standby battery needs for your installation. These capacities have a built-in 20% derat-
ing factor. Complete the remaining instructions in Table 4.2.
Batteries larger than 18 AH will not fit in the main control cabinet, and must be housed in the RBB Accessory Battery Cabinet. The system
supports a maximum of 33 AH batteries.
AUX
CMD2 CMD1
AUDIO
COMMON
IN
GND
VBUS IN 1
VBUS OUT 1
+
+
EVS-VCM
EVS-INT50W
EVS-INT50W
to next EVS-INT50W or EOL resistor
Figure 4.22 VBUS Wiring for EVS-VCM to EVS-INT50W
supervised,
power-limited,
Class B
NOTE: The EVS-INT50W is powered by a NAC on the FACP or by an auxiliary power supply. It will not be found using JumpStart
AutoProgramming.
Device
No. of
Devices
Current Per Device
Standby
Current
Alarm
Current
EVS-INT50W 25V 1 Standby: 52 mA 52mA
Alarm: 275 mA 275mA
EVS-INT50W 70V 1 Standby: 52 mA 52mA
Alarm: 310 mA 310mA
A Current Subtotals: mA mA
Notification Devices Refer to device manual for number of devices and current ratings.
B Current Subtotals: mA mA
C Total current rating of all devices in system (Line B) X 0.001 A A
D Number of standby hours (24 or 60 for NFPA 72) H
E Multiply line C (standby current) and D: Total standby AH AH
F Alarm sounding period in hours (For example, 5 minutes = 0.0833 hours): H
Table 4.2 Current Draw Calculations
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