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K2200 Series | Installation Guide | 5.0 Installation Details EN | 27

Bosch Security Systems | 7/03 | 17375 1.3 / 46513C

5.3.6 Battery Backup

The 12VDC 7AH battery (if in a fully-charged, good

condition) provides approximately 2.0 hours of

standby time for a fully loaded system.

A battery charging facility is available that can

provide up to 0.5 A at 13.8 VDC or 0.25 A at 27.6

VDC.

Door Controllers

The battery backup voltage must match

the lock output voltage, i.e. 12 V VDC or

24 V VDC. You may use two 12 VDC

batteries in series to provide 24 VDC.

The capacity of the battery required should be

calculated based on:

• The current consumption of the door controller

(1 A).

• The current consumption of the devices attached

to the reader channels (up to 800 mA).

• The current consumption of the locks when

operating normally (up to 2 A each).

• The type of lock, continuous (fail-safe) or

intermittent (fail-secure).

• The length of time the system should operate

without mains power.

• The following tables will help you estimate the

current.

Lock Supply Current

For continuous, or fail-safe locks the continuous lock

supply current is the current drawn by the lock. For

fail-secure locks, however, you need to estimate the

equivalent continuous current by using the following

equation:

Figure 14: Continuous Current Estimation

Equation

CLC = {Lock Current Rating x LRT} x

NOP / 3600

where

CLC = Equivalent Continuous Lock Current

LRT = Lock Release Time (in seconds)

NOP = Number of Operation per hour

The lock current rating should be indicated in the

lock specification.

Example:

A 500 mA lock strike with a 5 second lock release time,

operating 50 times an hour would give:

CLC = (500 x 5) x 50 / 3600 = 35 mA

Note:

If you have any doubt about the current drawn by a

lock, you should measure it at the controller using a

meter.

The maximum current that should be drawn from

each lock output is:

2.0 A at 12 VDC 1.0 A at 24 VDC

In Table 11 record the type and current consumption

of each lock fitted.

Table 11: Continuous Lock Supply Current

Channel Type:

Continuous/

Intermittent

Continuous

Lock Current

Total =

Reader Supply Current

There is a maximum of

200 mA available per reader channel on the 18 V

supply. Readykey readers of all types draw

approximately 90 mA each continuously. If you fit

Alarm Modules or AEMs, a reader combiner or

Wiegand interface unit, you should ensure that the

maximum current available, 800 mA, is not

exceeded.

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