TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
5.15.2. IN-SYNC WAIT DELAY
The TSC 900 transfer control logic includes an adjustable time delay for maximum time
allowed to perform an in-sync transfer operation for Closed Transition type automatic
transfer Switches or Open Transition In-Sync ATS’s. If the selected time expires before
the transfer switch sources reach an in-sync condition, the Transfer Fail logic will be
initiated. Select desired time in seconds.
5.15.3. EXTERNAL SYNC CHECK WAIT DELAY
When the ATS is ordered with a Closed Transition option (i.e. ATS Model Code Digit
#13 “Operation Type” 3 or 4), and an external synchronizer is supplied, a sync check
wait delay time feature is available. When the Fail to Sync alarm feature is enabled
(refer to Section #5.10.13), this timer is programmed to allow the desired amount of
time for the auto synchronizing process to occur. If the External Sync Check wait delay
expires, an alarm will be posted and the ATS will either halt or continue auto
synchronizing operation based on the setting of option feature “HALT TRANSFER ON
FAIL TO AUTO SYNC” refer to section 5.10.3 for programming information.
5.15.4. SOURCE FREQUENCY DIFFERENTIAL HIGHER THRESHOLD
Set to the desired source frequency differential higher set point as expressed in
percentage of nominal system frequency. An in-sync transfer operation will be blocked
if the measured difference between both source frequencies reaches a higher
threshold value than specified.
5.15.5. SOURCE FREQUENCY DIFFERENTIAL LOWER THRESHOLD
Set to the desired source frequency differential lower set point as expressed in
percentage of nominal system frequency. An in-sync transfer operation will be blocked
if the measured difference between both source frequencies reaches a lower threshold
value than specified.
5.15.6. SOURCE VOLTAGE DIFFERENTIAL HIGHER THRESHOLD
Set to the desired source voltage differential higher set point as expressed in
percentage of nominal system voltage. An in-sync transfer operation will be blocked if
the measured difference between both source voltages reaches a higher threshold
value than specified.
5.15.7. SOURCE VOLTAGE DIFFERENTIAL LOWER THRESHOLD
Set to the desired source voltage differential lower set point as expressed in
percentage of nominal system voltage. An in-sync transfer operation will be blocked if
the measured difference between both source voltages reaches a lower threshold
value than specified.
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