1-4
TBC OPR OPR 071019
1.5
OVERVOLTAGE PROTECTIONS AND SPECIAL FEATURES
The TBC incorporates switching power supplies with power factor correction (PFC). A Control
Board in the TBC controls and monitors critical functions of the TBC Battery Charger. The front
panel contains a main Circuit Breaker, voltage and current meters, status indicators (LED), and
an Equalize Timer control.
The Charger provides remote control connections and monitoring connections for DC output,
ON/OFF, Start/Reset, Equalize Timer, remote voltage sensing, and logic outputs for status mon-
itoring.
The Charger provides remote control connections and monitoring connections for DC out-put,
ON/OFF, Start/Reset, Equalize Timer, remote voltage sensing, and logic outputs for status mon-
itoring.
The DC output has factory preset voltage and current limit adjustments.
The TBC has an overvoltage protection circuit that senses the output at the Monitor terminals. It
compares a part of the output voltage to a reference voltage. If an overvoltage occurs, Sensing
Voltage Comparators shut off the oscillator, thereby resulting in zero output power. Similar cir-
cuits provide overcurrent and overtemperature protection, resulting in zero output power if either
condition is detected. In all cases, if the unit shuts off, the unit must be rest by either a) removing
a-c input power and the battery for about 30 seconds and then turning the unit back on again or
b) using the remote control (RC) terminals of TB2 at the rear panel to toggle the unit to OFF,
then ON for immediate reset. For overtemperature, the unit must cool sufficiently for reset to be
effective.
