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| Illustration 1 | g00578242 |
Upper Display With SP Fault Code SP1 Showing | |
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| Illustration 2 | g00850395 |
System Schematic For Spare Fault Inputs | |
A spare fault informs the operator of an undesirable condition (fault) that exists. The spare inputs are programmed into the GSC to meet the requirements of the customer or application. An active spare input causes an alarm fault or a shutdown fault. For programming of the spare inputs, see System Operation, "Spare Input/Output Programming OP6". The programmer (customer, operator or service personnel) should make a note of the actual conditions that cause an SP fault code to be shown on the upper display. The GSC does not diagnose the spare inputs. Spare faults are not recorded in the fault log.
The GSC treats an active input state as a fault. The active state can be programmed on the GSC as a high voltage level or a low voltage level. The factory default is a low voltage level. A high level is within the range of +5 DCV to + battery. If the input remains floating, the GSC pulls up the input voltage to 10.5 DCV. In this case, the input is treated as high level. An example of a floating input would be an open switch. A low level on the input is "B-" (ground).
When a spare fault occurs, the GSC determines the type of fault. There are two types of faults: alarm and shutdown. Then, the GSC FLASHES the corresponding fault alarm indicator or fault shutdown indicator. The SP fault code is immediately shown on the upper display for a shutdown fault. For an alarm fault, the alarm code key is pressed first. Then, the SP fault code is shown on the upper display. After a spare fault is corrected or a spare fault is not present, the SP fault code is no longer shown on the upper display.
| Spare Fault Codes | |||
|---|---|---|---|
| Spare Fault Code |
GSC Connector Contact |
Terminal Strip |
Related Setpoints (1) |
| SP1 Spare Fault 1 |
23 | SP1 | SP01, SP02, SP03 |
| SP2 Spare Fault 2 |
24 | SP2 | SP04, SP05, SP06 |
| SP3 Spare Fault 3 |
25 | SP3 | SP07, SP08, SP09 |
| ( 1 ) | See Systems Operation, "Spare Input/Output Programming OP6". |
SP fault codes are associated with the spare inputs. The SP fault code that is shown on the upper display identifies the spare input that caused the alarm fault or the shutdown fault. The spare inputs are accessed on the terminal strip within the control panel on an inside wall.
When an SP fault code is showing on the upper display, check the notes which were made by the service personnel in order to determine the cause.
The spare fault input can be used with a customer installed component.
Troubleshooting Procedure
In order to troubleshoot spare faults, use the following general procedure.
- Check for obvious causes which are related to the device that is responsible for the spare fault.
- Verify that the programming of the spare fault (alarm or shutdown) is appropriate for the application.
- Check the function of the responsible device. Reset the fault by turning the engine control switch (ECS) to the OFF/RESET position. Verify that the fault is still present.
- Disconnect the responsible device from the spare fault input and verify if the fault still exists.
- Check the wiring to the corresponding spare fault input for an unwanted short. The short can be to the battery negative ("B-"). The short can be to the battery positive terminal ("B+").