971091 Volvo.Penta Lock nut

Illustration 1 g00474240
GSC Display Area With Service Mode Descriptions Of Keypad.
(1) Dedicated Shutdown Indicators. (2) Fault Shutdown Indicators. (3) Fault Alarm Indicator. (4) Upper Display. (5) Lower Display. (6) Keypad.
Service Mode is used for the following purposes.
Assist with troubleshooting of diagnostic faults
Satisfy special applications
Satisfy customer needs
Verify generator set functions
Calibrate or adjust generator set functionsService mode has ten options that can be selected. Service personnel use the option to obtain information about the generator set, and the operator can program functions of the generator set.
Table 1
OP1 Fault log viewing
OP2 Setpoint viewing
OP3 Password entry
OP4 Fault log clearing
OP5 Setpoint programming
OP6 Spare Input/Output programming
OP7 Hourmeter programming
OP8 Voltmeter/Ammeter programming
OP9 Engine setpoint verification
OP10 AC offset adjustment The keypad and the display of the GSC are used for activating service mode and selecting the desired option. In service mode, the keys on the keypad have different functions, and the keys on the keypad have different names. The preceding illustration shows the name of each key in service mode. Also, there is a film (label) on the vandal door of the control panel that identifies each key. The service functions of the keys are listed below.Scroll Right Key - This key is used to view information by scrolling. When you are entering the password this key represents the number 1. Scroll Up Key - This key is used to scroll up through information or this key is used to increase the value of information. When you are entering the password this key represents the number 2.Scroll Down Key - This key is used to scroll down through information or this key is used to decrease the value of information. When you are entering the password this key represents the number 3.Note: In order to rapidly scroll through a large range of information, hold down the appropriate scroll key.Select Key - To view an option, use the Select Key. To change an option, use the Select Key. To start the scrolling of information, use the Select Key.Enter Key - This key is used to enter information that has been changed into the memory of the GSC. Exit Key - This key is used to exit service mode, returning the display to normal mode. The "SERV" indicator on the upper display is NOT SHOWING when the GSC is NOT in service mode. Service Mode Key - This key is used to enter service mode. The "SERV" indicator on the upper display FLASHES when the GSC is in service mode. The "SERV" indicator on the upper display FLASHES when the keypad performs service mode functions.Procedure To Enter Service ModeNote: Any active shutdown fault must be made inactive in order to access service mode. A FLASHING shutdown indicator means that a shutdown fault exists. To temporarily change a shutdown fault from an active shutdown fault to an inactive shutdown fault, turn the ECS to the OFF/RESET position. To permanently change a shutdown fault from an active shutdown fault to an inactive shutdown fault, the fault must not be occurring. Also, the ECS must be turned to the OFF/RESET position. If the jumper from terminal 6 to terminal 9 is not installed on the ECS, then the GSC will not power up in OFF/RESET and any active shutdown fault must be corrected before entering service mode.Note: Service mode cannot be entered when the ECS is in the AUTO position.Note: For exceptions, see "GSC History" in Systems Operation, "EMCP Electronic Control (Generator Set)".
Press the "SERVICE MODE" key on the keypad of the GSC. The "SERV" indicator on the upper display FLASHES whenever the GSC is in service mode.
The desired option (OP1 through OP10) can now be selected. Each option is described in the topics that follow.
To return to normal mode, press the "EXIT" key a few times until the "SERV" indicator is not showing. Note: To enter service mode options OP4 through OP8, the engine must be shut down. Turn the ECS to the STOP position.Service mode options OP4 through OP10 are password protected to reduce the possibility of information being altered by mistake. OP3 is the password entry option and the password must be correctly entered before access is gained to OP4 through OP10. See Systems Operation, "Password Entry OP3". Options OP1 and OP2 are for the viewing of information and are not password protected.