Scully ST-15C Series, Technical Manual

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2.3 Initial System Checkout
2.3.1 Test Equipment
Scully suggests the use of Scully Model ST-2-CBE Series Tester to perform the commissioning tests as
described below. The tester will expedite the initial system checkout of the ST-15C. While not required, the
tester provides all of the proper overfill prevention system signals to verify the new installation without the
need to secure an actual vehicle for testing.
2.3.2 Operational Testing
Apply power to the ST-15C control unit.
The red light should be ON, provided Bypass Control Switch is in NORMAL position.
Check status of lights with Bypass Control Switch in the following positions:
NORMAL: Red light should be ON
BYPASS: Both lights should be OFF
Set Bypass Switch to NORMAL position, the normal operation setting. The Bypass Switch should be kept
under a lock (user provided) so that its’ setting cannot be tampered with.
Connect Sculcon plug to socket on the tester. Follow instructions provided with the tester.
The tester is capable of checking controllers that can monitor up to 8 Scully sensors (2-wire thermistor or
Optic Sensors). As ST-15C is a single point controller (monitors only one sensor) the tester only needs to
test in one of the eight positions of the selector switch on the tester. Select switch position 5 to test the
ST-15C. As the tester simulates a vehicle equipped with 2-wire sensors, the ST-15C output will go
permissive immediately with green light ON and red light OFF.
Follow instructions provided with the tester to test both permissive and non-permissive states of the ST-
15C controller.
2.4 System Operation
Connect the Sculcon plug to socket on the vehicle to be loaded. The ST-15C controller will go
PERMISSIVE immediately (i.e. green light ON). The output relay contact closes enabling the loading to
begin. If there is a fault in the sensor, wiring interconnections or the controller circuitry the controller output
will stay NON-PERMISSIVE (does not allow loading to begin). If a fault develops during loading or liquid
level reaches the sensor, the controller will switch to NON-PERMISSIVE (i.e. red light ON and output relay
contact opens).
Disconnect Sculcon plug from the socket after the loading is complete. Hang the plug on the hook provided
on the Sculcon junction box (or in Scully Plug Storage Hanger socket).