BFAS model #SS9602 is a newly patented battery monitor holding patent
on the proven relationships between current and impedance, model#SS9602
detects battery failures, inverter shut down and transfers to bypass.
a battery develops problems, it's impedance will rise and less A/C
current will flow. AC current is a normal, though minor, component
in the charging circuit of battery systems.
monitoring instrument is adjusted to alarm at a low current threshold,
allowing time for a pre-emptive battery service to replace the failed
cell or battery before the system fails.
filter capacitors are monitored via a high current alarm set-point.
As DC filter capacitors deteriorate, there is a rise in AC current.
Model #SS9602 will sound an alarm that will prompt replacement of
the DC filter capacitors before the system performance is compromised.
shutting down your system, installation is simple and non-invasive!
model #SS9602 is designed to monitor true on-line UPS
System batteries, i.e., the inverter is powering the load at all
times when utility and/or battery power is available. It will sound
an alarm if the batteries fail, the DC filter deteriorates or when
the inverter stops.
on-line UPS system reflects the AC ripple current found in the battery
system. This ripple current remains relatively constant provided
the battery impedance remains the same. If the battery impedance
rises the ripple current lessens. This long overlooked phenomenon,
which is the basis for the BFAS patent, tells more about a system's
capability than any other product on the market today.
impedance of the batteries goes up current goes down
the DC filter impedance goes up current goes up
the inverter stops current goes down
load goes up current goes up
load goes down current goes down
Some significant load changes may require that the monitor be readjusted
to allow for the changes.
Condition Evaluation Procedures
is important that a record of the initial stop of the monitor and
any changes to the set up be kept for future reference. Normal operating
load should also be noted.
following conditions can cause the monitor to go into alarm.
Failure of one or more batteries in the system. (low alarm, red
low alarm LED goes out)
Failure of one or more DC filter capacitors. (high alarm, red high
alarm LED goes out)
Significant load changes. Increased load = high alarm, (high alarm,
red high alarm LED goes out), decrease load = low alarm. (low alarm,
red low alarm LED goes out)
Unit transfers to bypass. (low alarm, red low alarm LED goes out)
Rectifier shut down due to failure or during normal operation of
the system when recitifier shuts down during a utility outage. (low
alarm, red low alarm LED goes out)
condition 1. (low alarm, red low alarm LED goes out)
Eliminate alarm condition 3,4, & 5 by checking UPS System.
Use Battery Evaluation Procedures on page 4 of this manual to isolate
the defective batteries.
condition 2. (high alarm, red high alarm LED goes out)
Eliminate alarm condition 3 by checking UPS System.
Conduct a maintenance check of the DC filter capacitors.
condition 3. (low alarm, red low alarm LED goes out) (high alarm,
red high alarm LED goes out)
Check for load changes. Readjust the monitor using installation
procedures if the load changes are permanent.
condition 4. (low alarm, red low alarm LED goes out)
Resolve the UPS problem and restore UPS to normal mode.
condition 5. (low alarm, red low alarm LED goes out)
Rectifier shut down for utility failure: Wait for return to normal
Rectifier shut down for no apparent reason: Take action to protect
your load. Batteries will be completely drained and the UPS will
shut down. Restore UPS to normal operation.
For any alarm condition: Turn armed switch to off, resolve the alarm
and be certain to re-arm the monitor.
Evaluation Using "Current" Technology
test must be done with the UPS system operating under normal load
following procedure was developed to help our customers troubleshoot
their battery strings and to help them understand how our patented
, AC current, battery monitor detects battery problems before power
failures and/or load failures.
an on-line UPS System, SCR or transistorized unit there should be
an acceptable level of AC ripple current and voltage imposed upon
the battery string.
an AC current reading on the battery string by positioning an AC
"clamp on probe" around any battery cable in a single
string or around all the positives or all the negatives in
take a reading on each individual string. If the batteries are capable
of supplying DC current during a power failure, AC current will
be present. If either or both readings show zero amps, that battery
string/strings has a problem. The high amp string will be the better
can isolate the problem simply by taking the following readings.
AC ripple voltage on the entire string. This will be a small
number of AC volts, 1 VAC to as high as 2 VAC. Much higher than
that indicates a problem. The problem may be in the UPS product,
i.e., the DC filter capacitors are open or have high impedance.
The total VAC will be evenly dropped along the battery string. This
is OHms LAw (the sum of the voltage drops in a series circuit will
equal the total voltage applied). Bad cells/jars will have higher
millivolt drops than good cells/jars. High voltage drops equal high
impedance which equals a bad cell/jar.
Determine and record AC millivolt drops on each cell/jar. Bad
cells/jars will have as much as 100 times the millivolt drop found
on the good cell/jar. Shut down system. Replace the defective cells/jars
and you should see ripple current appear when the system is returned
to normal operation. Identical strings should have similar currents
and similar voltage drops if the UPS load currents are equal. Take
your readings from connector to connector, not post to post. This
will check the connections as well as the battery.
AC ripple is directly related to the impedance of the battery. Impedance
of the battery is directly related to the batteries ability to do
you use this procedure you will fully understand how, by constantly
monitoring the AC ripple current with the BFAS model #SS9602, you
can detect battery problems before load failures.
monitor has successfully detected battery failures, untorqued connections
and DC filter failures. It will detect open fuses or open disconnects
on the DC link. No other battery monitor can do as much, no matter
how much you pay for it.
our non-invasive single connection we don't add connection problems
to your battery strings and we don't have any printer or software
problems. We use Ohm's law. It's that simple.