Potter SCA User manual

SCA and DCA
Single Channel and Dual
Channel Amplier Manual
Document 5409206-Rev. A
4/21
Potter Electric Signal Company, LLC
St. Louis, MO
Customer Service: [phone] • Technical Support: [phone] • Fax: [phone]
For listing information visit our website www.pottersignal.com

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
1. Installation Wiring Documents
Figure 1. SCA-2525, SCA-2570, SCA-5025 and SCA-5070 Wiring Diagram
Figure 2. SCA-10070 Wiring Diagram

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Figure 3. DCA-5025 and DCA-10025
Type of Circuit Voltage Type Power Type
AC Connection High Voltage Non-Power Limited
Battery Connection Low Voltage Non-Power Limited
P-Link Low Voltage Power Limited
V-Link Low Voltage Power Limited
Speaker Circuits Low Voltage Power Limited

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Main Supply Circuit
The AC terminal is located in the upper left hand portion of the main board. The main board supervises the main AC
power and provides indication that the AC power is absent.
Figure 4. Main Supply Circuit
The terminals are rated at 120 VAC/240 VAC 50/60 Hertz and are marked so accordingly on the board. The earth
ground connection is marked as “G” and is the furthest connection from the line voltage connection.
The AC input power ratings:
SCA-2525, SCA-2570, SCA-5025 and SCA-5070 Ampliers:
Maximum of 242mA at the nominal 120 VAC rating
Maximum of 137mA at the nominal 240 VAC rating
SCA-10070 Ampliers
Maximum of 443mA at the nominal 120 VAC rating
Maximum of 246mA at the nominal 240 VAC rating
DCA-5025 and DCA-10025 Ampliers
Maximum of 532mA at the nominal 120 VAC rating
Maximum of 300mA at the nominal 240 VAC rating
Rechargeable Battery Circuit
The battery charging circuit is provided in the bottom portion of the board. Terminal connections are provided to
connect wire leads for battery connection. The battery must be a recognized or listed sealed lead acid battery or
equivalent.
The battery charging voltage is approximately 27.3 VDC and the circuit is supervised. The battery circuit is protected
with a non-replaceable 7 amp poly switch located on the main circuit board. The maximum battery charging circuit is
1.0 amp DC.
The battery circuit is rated for 8 to 55 AH batteries and the cabinet will house up to two 18 AH batteries. The batteries
will operate the panel for at least 24 hours and 15 minutes of alarm. To determine the minimum size batteries for
standby and alarm times desired, the installer must complete a battery calculation work sheet to determine the
minimum battery size for a particular application. For reference, the battery calculation work sheet is attached as
Appendix A. Complete standby battery calculations must be completed to ensure adequate battery sizes are provided.

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Figure 5. Battery Circuit Connections
Separation of Circuits - Power Limited, Non-Power Limited, High Voltage Wiring
The main AC power connection is considered high-voltage and non-power limited. The Battery conductors, and the
low AC and trouble relays are nonpower limited. All remaining circuits are low-voltage, power limited connections.
Proper separation must be maintained between the circuits listed above. All separations in the dierent wiring must be
maintained by at least 0.25 inches and the wire insulation must be for the higher voltage.
In the panel there are sucient knock outs located around the periphery of the cabinet to allow the installer to
maintain power limited and non-power limited connections.
P-Link
The SCA and DCA ampliers operate in conjunction as an expansion device with the IPA-4000V via P-Link.
All expansion devices are supervised via the RS-485 connection. Wiring is fully supervised, and power limited. Any
connection to ground of 0 ohms will be annunciated as a ground fault.
P-Link Voltage = 24 VDC
Maximum wire length = 6,500 feet.
Maximum wire resistance = Maximum wiring resistance is based on load.
Calculate using the following equation
(Total P-Link Alarm Current) x (Wire Resistance) < 6 volts.
Figure 6. P-Link Class B Wiring Example
DWG #593-5
Panel
Connections
BATTERY
-+
12 V
Battery
-+
12 V
Battery
-+

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Figure 7. P-Link Class A Wiring Example
V-Link
The V-Link is a supervised proprietary bus that transmits audio to designated channels on SCA and DCA ampliers.
Wiring is fully supervised, and power limited. Any connection to ground of 0 ohms will be annunciated as a ground
fault.
Maximum wire length = 6500 feet
Figure 8. VM-1000 VLINK1 Class B
Figure 9. VM-1000 VLINK1 Class A

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Figure 10. VM-1000 VLINK1 and 2 Class B
Figure 11. VM-1000 VLINK1 and 2 Class A
Technical Specications
SCA-2525, SCA-2570, SCA-5025 and SCA-5070
Standby Current 58 mA
Alarm Current 608 mA
Maximum number of ampliers 31
SCA Cabinet Dimensions 16” x 17” x 3 7/8”
Operating Temperature Range 32° to 120° F (0° to 49°C)
Operating Humidity Range 10% to 93% (non-condensing)
SCA-10070
Standby Current 60 mA
Alarm Current 766 mA
Maximum number of ampliers 31
SCA Cabinet Dimensions 16” x 17” x 3 7/8”
Operating Temperature Range 32° to 120° F (0° to 49°C)
Operating Humidity Range 10% to 93% (non-condensing)
DCA-5025 and DCA-10025
Standby Current 48 mA
Alarm Current 520 mA
Maximum number of ampliers 31
SCA Cabinet Dimensions 19” x 27 3/8” x 4 5/8”
Operating Temperature Range 32° to 120° F (0° to 49°C)
Operating Humidity Range 10% to 93% (non-condensing)

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
General Wiring Information
The cabinet has various conduit knockouts located around the cabinet for ease of wire installation. In addition, this
method provides a means to separate dierent types of circuit to reduce electrical interference, transient voltage, or
voltage ratings.
The enclosure requires the use of power limited and non-power limited wiring on the main board as well as within the
enclosure. Power limited wiring is to remain separated from non-power limited by a minimum or 0.25 inches and all
cablings should be insulated to the higher voltage.
When the panel is installed, the National Electrical Code (NEC, NFPA 70) should be followed for the proper
installation and separation of power limited and non-power limited circuits. The mixing of power limited, and non-
power limited should be avoided. Refer to the following gure for suggested wiring routing.
Figure 12. SCA and DCA Wire Routing

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
2. Functionality
The system is completely supervised and is designed to comply with UL 864 and UL 2572.
Models:
Model Description Accessories
SCA-2525 SINGLE CHANNEL 25W, 25V AMPLIFIER None
SCA-2570 SINGLE CHANNEL 25W, 25V OR 70V SELECTABLE AMPLIFIER None
SCA-5025 SINGLE CHANNEL 50W, 25V AMPLIFIER None
SCA-5070 SINGLE CHANNEL 50W, 25V OR 70V SELECTABLE AMPLIFIER None
SCA-10070 SINGLE CHANNEL 100W, 25V OR 70V SELECTABLE AMPLIFIER None
DCA-5025 DUAL CHANNEL 50W, 25V AMPLIFIER 70V-1000
BUA-1000
DCA-10025 DUAL CHANNEL 100W, 25V AMPLIFIER 70V-1000
BUA-1000
The SCA-2525, SCA-2570, SCA-5025, SCA-5070 and SCA-10070 models are addressable single channel ampliers
that distribute live voice and ECS to 8 Class A or 8 Class B speaker outputs.
The DCA-5025 and DCA-10025 models are addressable dual channel ampliers that distribute live voice and ECS to
8 Class A or 8 Class B speaker outputs.
Figure 13. SCA and DCA Class A and Class B Speaker Wiring
A maximum of thirty-one (31) SCA or DCA ampliers can be utilized with an IPA-4000V which oers a total of
248 Class B or Class A speaker circuits. All speaker circuits are fully supervised and programmable through Potter
software. Reference the IPA-4000V manual for programming instructions.

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Figure 14. Dip Switch Settings
Amplier
Address
Dip Switch Settings
SW-1 SW-2 SW-3 SW-4 SW-5
1ON OFF OFF OFF OFF
2OFF ON OFF OFF OFF
3 ON ON OFF OFF OFF
4OFF OFF ON OFF OFF
5ON OFF ON OFF OFF
6OFF ON ON OFF OFF
7 ON ON ON OFF OFF
8 OFF OFF OFF ON OFF
9ON OFF OFF ON OFF
10 OFF ON OFF ON OFF
11 ON ON OFF ON OFF
12 OFF OFF ON ON OFF
13 ON OFF ON ON OFF
14 OFF ON ON ON OFF
15 ON ON ON ON OFF
16 OFF OFF OFF OFF ON
Amplier
Address
Dip Switch Settings
SW-1 SW-2 SW-3 SW-4 SW-5
17 ON OFF OFF OFF ON
18 OFF ON OFF OFF ON
19 ON ON OFF OFF ON
20 OFF OFF ON OFF ON
21 ON OFF ON OFF ON
22 OFF ON ON OFF ON
23 ON ON ON OFF ON
24 OFF OFF OFF ON ON
25 ON OFF OFF ON ON
26 OFF ON OFF ON ON
27 ON ON OFF ON ON
28 OFF OFF ON ON ON
29 ON OFF ON ON ON
30 OFF ON ON ON ON
31 ON ON ON ON ON
The SCA and DCA ampliers are equipped with a proprietary P-Link communication bus to operate in conjunction
with an IPA-4000V. The ampliers are also equipped with a proprietary V-Link bus to receive audio from the VM-
1000 contained in the IPA-4000V.

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
The 70V-1000 may be installed on the DCA-5025 and DCA-10025 to extend the voltage output to 70.7V. Refer to the
70V-1000 installation sheet (#5409211) for additional information including mounting.
Figure 15. 70V-1000
The BUA-1000 may be installed on the DCA-5025 and DCA-10025 to provide backup amplication during internal
amplier failure. Refer to the BUA-1000 installation sheet (#5409212) for additional information including mounting.
Figure 16. BUA-1000

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
The SCA-2525, SCA-2570, SCA-5025 and SCA-5070 is equipped with a universal power supply to support 120VAC
and 240VAC 50Hz/60Hz.
The SCA-10070, DCA-5025 and DCA-10025 require a shunt on J1 to select 120VAC or 240VAC, 50Hz/60Hz.
SCA-2525, SCA-2570, SCA-5025, SCA-5070 and DCA-5025: A maximum of 50W per circuit at 25V and 70V.
SCA-10070: A maximum of 100W on circuit 1 at 25V and 70V, and 50W maximum on circuits 2-8 at 25V and 70V
DCA-10025: A maximum of 100W on circuits 1 and 5 at 25V and 70V, and maximum of 50W on circuits 2, 3, 4, 6, 7
and 8 at 25V and 70V.
3. Compatibility
The SCA and DCA ampliers are compliant with UL 464 520 Hz signaling with the following speakers:
Potter Signal Series: FASPKR, SPKSTR-24CLP and SPKSTR-24WLP
Gentex Series: SSPKCLP, SSPK24WLP and SSPK24CLP
System Sensor Series: SPCRL and SPRL
Wheelock Series: E50 and E60

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
Appendix A: Battery Calculation Worksheets
Description Quantity Standby
(mA)
Total
Standby
(mA)
Alarm
(mA)
Total
Alarm
(mA)
SCA-2525 1 58 58 608 608
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH
SCA-2570 158 58 608 608
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH
SCA-5025 1 58 58 608 608
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
SCA-5070 158 58 608 608
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH
SCA-10070 1 60 60 766 766
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH
DCA-5025 1 48 48 520 520
BUA-1000 48 52
70V-1000 2 562
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH

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SCA DCA INSTALLATION MANUAL-5409206-REV A 4/21
DCA-10025 1 48 48 520 520
BUA-1000 48 52
70V-1000 2 562
Total (mA) Total (ma)
Convert to Amps x 0.001 Convert to Amps x 0.001
(*Refer to maximum allowable standby current) Total A: Total A:
Multiply by standby hours x____
60 minutes per hour
Alarm time (minutes)
Example:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH Total Alarm AH
+Total Standby AH
Total AH
Eciency Factor ÷ 0.80
Required AH