ABB RER620, Technical Manual

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Section 9
Other functions
RER620 431
Technical Manual
9.1.5 Signals
Table 385: UPS input signals
Table 386: UPS output signals
9.1.6 CVD Voltage Clamping
It is possible for some embedded Capacitor Voltage Divider (CVD) sensors to measure, a
voltage in excess of +/-4% tolerance, under conditions of extreme humidity or wetting of
pole surfaces. The 'CVD clamping' function clamps the measured voltage from the CVD
sensors, to /- 4% of a reference voltage. The Clamping function is intended to be
used with certain types of reclosers, please contact ABB for further clarification.
The necessary reference voltage can be obtained by connecting three external potential
transformers (PTs) to the V1abc or V2abc analog inputs of the relay [Refer to Figure 186].
Alternately, in the absence of the three external PTs, the PT used to power up the recloser
control cabinet may be used as the reference when connected to the V1abc or V2abc inputs
of the relay [Refer to Figure 187]. All applicable limitations are listed at the end of the
section.
Name Type Default Description
START_TST BOOLEAN 0=False This tests the battery’s charge and overall health by briefly
connecting a low resistance load parallel to the battery and then
measuring the battery voltage. The battery voltage before the
load was applied and the voltage during the time the load is
applied are compared to determine battery health. The load is
about 1.5 ohms, and the connection time for the load is 0.1
seconds. Ten measurements are taken and averaged together in
the last 25 milliseconds of the test period resulting in the battery
voltage test measurement. After the battery is tested, a cool
down period for the UPS’s battery load resistors is required.
During the cool down period, the battery test function is blocked.
Reset UPS BOOLEAN 0=False Resets the microprocessor of the UPS
Name Type Description
TST_VOLT SIGNAL Battery voltage after test in Vdc
TST_RESULT ENUM Indicates the battery test result:
0 = Ready for battery test
1 = Battery test is registered
2 = Battery interrupt for PWM3 is now enabled and is used as a timer
3 = Battery test in process (lasts about 0.075 second during which Boost
and Battery Charge functions are disabled
4 = Battery test in process, and measurements are being taking (lasts
about 0.025 second
5 = Battery test has been completed for 25 milliseconds, now take non-test
battery voltage
6 = In cool-down period
7 = 60VDC rail voltage too low to test
8 = Within ten seconds of reset (must be at least 10 seconds out of reset to
start battery test)