6.5
Date Code 20170207 Field Reference Guide SEL-734B Capacitor Bank Control
Commissioning
Troubleshooting and Common Problems
➤ If the 52a contacts are connected to the enclosure, ensure the
signal deasserts when the switch is open. Ensure the signal
asserts when the switch is closed.
➤ After each operation, ensure the SEL-734B indicates the
proper switch status.
Compact Enclosure
Compact enclosures contain one open contact and one close contact to control
one three-phase switch, or three single-phase switches that are electrically
connected. The Compact Enclosure does not connect to the switch auxiliary
contacts.
Please use the following guidelines to ensure the controller operates the
switches properly.
➤ Verify output contacts operate properly.
➤ Ensure each output contact remains asserted for the configured
duration.
➤ After each operation, ensure the SEL-734B indicates the
proper switch status.
Troubleshooting and Common Problems
CLOSE or OPEN
Button Does Not
Respond
➤ Check that the manual mode is enabled. Press the MANUAL
pushbutton to enable this mode.
➤ Check that the control power is healthy.
➣ Check that the control power fuse located on the inside of
the enclosure has continuity.
➣ Check that 120 Vac is present. Refer to the enclosure
wiring and check that 120 Vac voltage is present between
the control power fuse and neutral.
➣ Check the front panel. Refer to the appropriate design
template guide to check the SEL-734B indicators of
control power.
➤ Check that an overvoltage or high neutral current does not
exist. To protect the switches and the capacitor bank, the
controller will not close a switch if an overvoltage or a high
neutral current condition exists. Refer to the appropriate design
template guide to check the SEL-734B lockout indicators.
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