3550 Battery HiTESTER Series
6
work, a failure in one of the other batteries
that is connected in series in a UPS could be
causing a relative increase in the battery
voltage, or the charger could be
malfunctioning. Increases in a battery's
voltage that are discovered during
maintenance appear never to be the result of
a problem with the battery itself.
Q4. Is it possible to use the
comparator for voltage only?
A4. Set the upper and lower limit values of the
comparator to 3000 (3550 and 3555), 3100
(3551) in the resistance range that is being
used. It is then possible to set the voltage
range and voltage comparison value to the
desired value. If the voltage exceeds the
comparison value, the PASS indicator lights; if
the voltage is equal to or less than the
comparison value, the WARNING indicator
flashes. However, if the resistance value is
too large and a constant current error occurs,
[- - - - ] is displayed and no LED lights.
Q5. Can the battery type number be
displayed instead of the
comparator number?
A5. This is not possible, because it would require
not only a software upgrade but also a new
LCD.
Q6. I want to measure a 48 V battery
assembly. Since voltage
evaluation is not needed, can
evaluation be based on
impedance only?
A.6 The maximum input voltage is 50 V DC for the
3550 and 3555 and 60 V DC for the 3551.
Therefore the impedance of a 48 V battery
assembly can be measured if voltage
evaluation is not required. Use the
comparator setting screen and set the voltage
comparator value to - 3000dgt (3551: -
3100dgt).
Q7. Is it possible to obtain separate
comparator outputs for
resistance and voltage?
A7. Because resistance and voltage comparator
output is obtained by software, it is not
possible to obtain separate comparator
outputs for resistance and voltage.
4 Input Protection….…...………………………………………………
Q1. Is input overvoltage protection
implemented, and how?
A1. Basically, in the case of both the 3550, 3555
and the 3551, it is not possible to input voltage
in excess of 50V DC (3551:60V DC), nor is it
possible to input AC voltage or current. If
such voltage or current is input, the unit will be
damaged. Although a design change that
adds a fuse will be implemented in new lots in
the near future in order to minimize the
number of failures resulting from such mis-
operation, the fuse will not be user
replaceable. Note that any unit failures
caused by overvoltage input will only be
repaired for a fee.
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