Bosch Appliances 3.5 8.3.8Connecting back-uppower, 13: Connecting power amplifier to ground, en

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 143

8.3.8Connecting back-up power

Connect the back-up power supply to the back-up power connector on the back of the amplifier. Refer to figure 8.13 and figure 8.14.

Mains

										115:
										100-120V	50-60Hz
										T6.3A 250V
										230:
Control In								Audio In		220-240V	50-60Hz
										T6.3A 250V
1	2	3	4	5	6	7	8	1	2	Signal Ground
										Grounded	Floating

+ 0 – + 0 –

Network

Control Out

Spare In

Lsp Out

2

Control Out

Spare In

Lsp Out

1

Control Out

Spare In

Lsp Out

4

Control Out

Spare In

Lsp Out

3

1

2

– – 0V 50V + +

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

– – 0V 50V + +

C NO NC

C NO NC

Class 2

Cau t ion

Wiring

Battery

48V 12A

48V 48V Non-isolated input + 0 Avis

15AT

48V

Battery 48V 12A

Non-isolated input + 0

figure 8.13: Connecting power amplifier to ground (1)

Network
	1				2			Control In								Audio In					Battery 48V	Mains	100-240V
								1	2	3	4	5	6	7	8	1	2	3	4
																0	0	0	0		0
	48V				48V																+
Control Out	Spare In		Lsp Out	1	Control Out	Spare In	Lsp Out	3		Control Out		Spare In			Lsp Out	5	Control Out		Spare In	Lsp Out
																					7
C NO NC		0V	50V		C NO NC		0V 50V			C	NO NC		0V	50V			C	NO NC	0V	50V

T6.3A H 250V

2	4	6	8	Caution
				Avis

15AT

Battery 48V Mains

48V

0

+

figure 8.14: Connecting power amplifier to ground (2)

Warning

Never ground the positive terminal of the battery, as this will damage the Praesideo equipment. If the back-up power supply (battery) is grounded, always connect the negative terminal (0) first and the positive terminal (+) second.

Disconnect in reverse order: disconnect the positive terminal first and the negative terminal second. This avoids excessive ground loop currents.

Warning

For safety reasons you must use an external circuit breaker. Install in accordance with the local Electrical and Building Code, e.g. for USA and Canada in accordance with NEC/CEC and for Germany in accordance with VDE0108-1. To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. See section 1.2 Intended audience

If a back-up power supply is used, the PRS-xPxxx amplifiers can switch to the Power-save mode to reduce the load on the battery. This mode is not supported by the LBB4428/00. See section 44.4.

When an amplifier is set to Power-save mode due to a mains failure, the audio inputs, and control inputs and outputs are still available for use. An ambient sensing microphone will continue to operate if connected to the amplifier for AVC.

Bosch Security Systems 2011-02