4.12. PHASE UNBALANCE PROTECTION ALARM RESET
When the TSC 900 is programmed with Phase Unbalance protection enabled, should a transfer
occur due to an out of limit phase unbalance condition, an alarm message will be shown on the
TSC 900 GHC display “UTILITY (or GEN) UNBALANCED”. The Phase unbalance feature may
be user programmed to provide two different re-transfer operating sequences (i.e. AUTO or
MANUAL RETRANSFER). When the “AUTO” re-transfer mode is selected, the load will be
automatically re-transferred back to the original source and does not require operator
intervention. When the “MANUAL” retransfer mode is selected, a re-transfer back to the original
source will not occur until the ALARM RESET button is pressed by ATS operator. For further
details on phase unbalance programming refer to Section 5.13.7 up to 5.13.10.
NOTE: When in the MANUAL RETRANSFER mode, if the alternate source fails, the alarm
lockout will not be bypassed inhibiting the load to re-transfer back to the original source even if
within limits. The reason the re-transfer is inhibited is phase unbalance is generally only
detected when load is applied to the source and the condition will appear to clear when the load
is removed, as such allowing a re-transfer to the failed source previously determined to have a
phase balance fault will only result in multiple unnecessary transfers of the load between
sources. Retransfer is set to lockout and requires operator intervention.
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