Marathon TSC 900 - Load Shed Set Frequency & Power Points; Load Shed Power (kW) Delay (Pickup); Load Shed Power (kW) Drop Out; Load Shed Power (kW) Pick Up

TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
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5.11.7. TRANSFER FAIL DELAY
The transfer fail timer is activated whenever a transfer sequence is initiated. The timer
will activate a fail alarm condition if the transfer switch fails to successfully transfer
within the transfer fail time delay setting.
5.11.8. TRANSFER MAX ERROR CONDITION DELAY
The Transfer Max Error Condition Delay is a timer which is activated whenever an
abnormal transfer sequence is initiated. The timer will activate a fail alarm condition if
the transfer switch fails to successfully transfer within the transfer fail time delay
setting.
5.11.9. TIMER GUARD DELAY
The “Guard” Time delay is utilized for ATS mechanisms which contain separate open
and close coils to operate the power switching devices. The Guard time is the
intentional time delay in between the open and close signals from the TSC 900
controller during transfer. This is to ensure there is adequate time for the “open” coil to
successfully release prior to initiating the signal to the associated “close” coil and vise
versa. This parameter will be factory set for the specific ATS mechanism type.
5.11.10. TRANSFER FIND NEUTRAL DELAY
For transfer switches equipped with type “S”, “T” or “M” operating mechanisms, a
TRANSFER FIND NEUTRAL delay timer is provided to ensure the ATS mechanism
correctly moves to the neutral position when load voltage is not available. When the
transfer switch controller signals the ATS to move to the alternate position, the transfer
output signal to the ATS motor will be energized for the time setting of the
TRANSFER FIND NEUTRAL timer setting. This parameter will be factory set for
the specific ATS mechanism type.
5.11.11. TRANSFER NEUTRAL DELAY
The neutral delay time period will be initiated once both of the power-switching devices
are in the open position during a transfer sequence. Select desired neutral delay time
in seconds. If no delay is required, set this time delay to zero.
Note: the Neutral Delay timer maybe automatically bypassed subject to the setting of
the “Neutral Bypass” feature (per Section 5.10.13) based on operating conditions or if
the originating source voltage is in a de-energized (i.e. blackout) state prior to transfer.
5.11.12. TRANSFER PRE DELAY (LDC)
The pre-transfer delay period will be initiated upon an impending transfer in either
direction when both sources of power are available. The pre-transfer output relay will