Siemens BC-35 Merkblatt

GENERAL GUIDELINES FOR INSTALLING

MODEL BC-35

P/N 315-086767-5

Siemens Industry, Inc.

Building Technologies Division

Florham Park, NJ

Siemens Building Technologies, Ltd.

Fire Safety & Security Products

2 Kenview Boulevard

Brampton, Ontario

L6T 5E4 Canada

The Model BC-35 battery charger/transfer module complies

with UL Standard 864. The module is designed to monitor

the battery charge status and alert appropriate personnel

when the batteries may not have the standby power

capacity required by NFPA Standard 72 Local, Municipal Tie,

Remote Station, or Proprietary.

The BC-35 charging circuit provides a charging current

only if the voltage of the batteries being used is

between 18.3 VDC and 27.7 VDC. If the battery voltage is

out of this range, the BC-35 will automatically cut off its

charging circuit.

CAUTION: Disconnect the system power input before

installing the BC-35 and/or BE-35 cable connections.

The BC-35 module has a trouble signal for both high and

low battery conditions. A trouble condition occurs:

During normal AC operation when the instantaneous

or constant voltage across the battery is more than

30 volts peak or is less than 24 volts.

During the battery backup operation when the

instantaneous or constant voltage across the battery

is more than 30 volts peak or is less than 21 volts.

When the battery trouble signal activates because of a low

battery voltage, it indicates that the batteries may have

inadequacies that will prevent the BC-35 from providing the

standby power capacity required to meet national and local

codes. When the signal activates because of a high battery

voltage, it indicates one of the following: 1) BC-35 malfunc-

tion, 2) poor battery terminal connections, or 3) a battery

that has an unacceptable high internal resistance.

It is recommended that the batteries be charged prior to

installation, if necessary. A voltage check of the batteries

should be performed to ensure that the BC-35 charging cir-

cuit will begin charging. Follow Steps 1 and 2 below. Step 2

may also be used to troubleshoot the BC-35 when a trouble

condition is indicated.

Step 1

Test the batteries connected to the BC-35 module.

a. Remove the battery leads.

b. Test the open battery voltage; it should be between

22 and 27 VDC.

c. Reconnect the battery and test it under a load con-

dition. If possible, remove the AC power from the

system and measure the battery voltage. Activate the

audible devices and again measure the battery

voltage. Under both conditions, the minimum

acceptable battery voltage is 21 VDC.

d. If it is not possible to test the batteries as previously

noted, utilize a simulated load. For example, with the

batteries disconnected, a 12 ohm, 50 watt resistor

should be placed momentarily (2-4 seconds) across

the 24 volt battery connections. Measure the battery

voltage under this loaded condition. Again, the

minimum acceptable voltage is 21 VDC.

Replace the batteries if the results of b, c, or d above are

not acceptable.

Step 2

Verify that the BC-35 is providing a charging current.

a. If an MM-35 is being used in conjunction with a BC-35,

check the meter and verify that a current is being

supplied to the batteries either in a constant or a

pulsed mode.

b. If no MM-35 is being used, place an analog VOM meter

with a 10 amp scale in series with the batteries con-

nected to the BC-35 module. If the batteries are being

charged, the VOM meter will indicate a constant

current or pulsed current is being provided to the

batteries.

A constant charging current or pulsed charging current

is displayed if the battery voltage is between 18.3 VDC

and 27.7 VDC. Once the battery is fully charged, a

pulsed charging current is present on a periodic basis.

The time between pulses is determined by the rate of

discharge due to the internal circuitry of the charger

and the ability of the individual battery to accept and

maintain the charge condition. The constant charge

current is between .5 and 1.5 amps for the BC-35 and

increases proportionally if BE-35 modules are used.

On initial system startup, when the battery charger is

functional, but the battery trouble indicator remains on,

the batteries may not have had time to properly

charge—as much as 24 hours may be necessary for

charging. After charging for 24 hours with the charging

current as described above, and the BC-35 trouble

signal still on:

1) If less than 24V is present across the battery:

(a) Batteries are not accepting the charge

(b) Battery capacity is too large for the BC-35

and the number of BE-35s being used

2) If more than 30V is present across the battery:

(a) Batteries used have high internal impedance

(b) BC-35 is not shutting off the charge state at

the required voltage point

If the BC-35 is not providing a charging current, test

pin 1 of the P1 plug on the BC-35 module in reference

to the negative side of the power supply. If there are no

volts at this point, replace the BC-35 module. If there

are more than 2 VDC at this point, and no alarm is

present, replace the CP-35 panel.

This information is provided to assist you in diagnosing

relatively routine problems. There may be extenuating

circumstances involved which are not covered here. If

further assistance is needed, please contact your Regional

Engineer or the Siemens Industry, Inc., Technical Support

Group.

WARNING: The BC-35 has been factory set for the bat-

teries specified. Any alteration or adjust-

ment to this module will void both the UL

listing and the Manufacturer’s Warranty and

may cause damage to the battery.

P/N 315-086767-5

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