POTTER SCA and DCA Single Channel and Dual Channel Amplifier Instruction Manual

POTTER SCA and DCA Single Channel and Dual Channel Amplifier

Installation Wiring Documents

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 an indication that the AC power is absent.

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 Amplifiers:

• Maximum of 242mA at the nominal 120 VAC rating
• Maximum of 137mA at the nominal 240 VAC rating

SCA-10070 Amplifiers

• Maximum of 443mA at the nominal 120 VAC rating
• Maximum of 246mA at the nominal 240 VAC rating

DCA-5025 and DCA-10025 Amplifiers

• 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 worksheet to determine the minimum battery size for a particular application. For reference, the battery calculation worksheet is attached as Appendix A. Complete standby battery calculations must be completed to ensure adequate battery sizes are provided.

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. The proper separation must be maintained between the circuits listed above. All separations in the different 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 sufficient knockouts 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 amplifiers 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 the 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.

V-Link
The V-Link is a supervised proprietary bus that transmits audio to designated channels on SCA and DCA amplifiers. Wiring is fully supervised, and power limited. Any connection to the ground of 0 ohms will be annunciated as a ground fault.

Maximum wire length = 6500 feet

Technical Specifications

SCA-2525, SCA-2570, SCA-5025 and SCA-5070

SCA-10070

DCA-5025 and DCA-10025

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 different types of circuits 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 figure for suggested wiring routing.

Functionality

The system is completely supervised and is designed to comply with UL 864 and UL 2572. Models:

The SCA-2525, SCA-2570, SCA-5025, SCA-5070 and SCA-10070 models are addressable single-channel amplifiers 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 amplifiers that distribute live voice and ECS to 8 Class A or 8 Class B speaker outputs.

A maximum of thirty-one (31) SCA or DCA amplifiers can be utilized with an IPA-4000V which offers 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.

Figure 14. Dip Switch Settings

Amplifier

Address

| Dip Switch Settings
---|---
SW- 1| SW- 2| SW- 3| SW- 4| SW- 5
1| ON| OFF| OFF| OFF| OFF
2| OFF| ON| OFF| OFF| OFF
3| ON| ON| OFF| OFF| OFF
4| OFF| OFF| ON| OFF| OFF
5| ON| OFF| ON| OFF| OFF
6| OFF| ON| ON| OFF| OFF
7| ON| ON| ON| OFF| OFF
8| OFF| OFF| OFF| ON| OFF
9| ON| 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
Amplifier

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 amplifiers are equipped with a proprietary P-Link communication bus to operate in conjunction with an IPA-4000V. The amplifiers are also equipped with a proprietary V-Link bus to receive audio from the VM-1000 contained in the IPA-4000V.

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.

The BUA-1000 may be installed on the DCA-5025 and DCA-10025 to provide backup amplification during internal amplifier failure. Refer to the BUA-1000 installation sheet (#5409212) for additional information including mounting .

• The SCA-2525, SCA-2570, SCA-5025, and SCA-5070 are 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 a maximum of 50W on circuits 2, 3, 4, 6, 7, and 8 at 25V and 70V.

Compatibility

• The SCA and DCA amplifiers 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

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|
Efficiency Factor| ÷ 0.80
Required AH|
SCA-2570| 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|
Efficiency 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|
Efficiency Factor| ÷ 0.80
Required AH|
SCA-5070| 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|
Efficiency 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|
Efficiency 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|
Efficiency Factor| ÷ 0.80
Required AH|
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|
Efficiency Factor| ÷ 0.80
Required AH|

firealarmresources.com.

References

• Fire Alarm Resources | Download fire alarm documents
• Potter Electric: Fire Alarms & Fire Sprinkler Systems

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