Bosch Appliances 3.5 manual Fan control, 15: Connecting back-upsupply

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 175

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.

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.

The back-up supply can be supervised by the basic amplifier (see figure 10.2, no. 9) and is available for the multi channel interface.

10.4 Fan control

The PRS-1B500, PRS-2B250, PRS-4B125 and PRS-8B060 amplifiers, from HW version 06/00 onwards, have a fan monitoring circuit that detects the actual fan rotation. This detection is needed for compliancy to the standards UL864 and UL1711, for use in the USA. Additionally the internal fans need to run at full speed for compliancy to these standards. A jumper on the main PCB selects between two positions:

•Normal (factory default) - The fans are temperature controlled, normally running at low speed and switching to high speed in case the temperature exceeds a certain level. Fan monitoring is not activated.

•Full speed - The fans run at full speed continuously. Fan monitoring is activated. Do not enable Switch amplifiers to standby (see section 44.4) for this selection, because in standby the fans are stopped and a fault would be generated.

For the PRS-1B500, the jumper is indicated on the PCB as X652; connection 1-2 selects Normal, connection 2-3 selects Full speed. See figure 10.16.

		15AT
		48V
Battery	48V	12A
Non-isolated input +		0

figure 10.15: Connecting back-up supply

For the PRS-2B250, the jumper is indicated on the PCB as X652 and X653 (one for each fan); connection 1-2 selects Normal, connection 2-3 selects Full speed. See figure 10.16.

For the PRS-4B125, the jumper is indicated on the PCB as X88 and X91 (one for each fan); connection 1-2 selects Normal, connection 2-3 selects Full speed. See figure 10.16.

For the PRS-8B060, the jumper is indicated on the PCB as X88 and X91 (one for each fan); connection 1-2 selects Normal, connection 2-3 selects Full speed. See figure 10.16.

Bosch Security Systems 2011-02