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CVC Operation and Menus (Fig. 14-20) GENERAL • The CVC display automatically reverts to the default screen after 15 minutes if no softkey activity takes place and if the chiller is not in the pumpdown mode (Fig. 14). • If a screen other than the default screen is displayed on the CVC, the name of that screen is in the upper right corner (Fig. 15). • The CVC may be set to display either English or SI units. Use the CVC configuration screen (accessed from the Service menu) to change the units. See the Service Operation section, page 45. • Local Operation — The PIC II can be placed in local operating mode by pressing the LOCAL softkey. The PIC II then accepts commands from the CVC only and uses the Local Time Schedule to determine chiller start and stop times. • CCN Operation — The PIC II can be placed in the CCN operating mode by pressing the CCN softkey. The PIC II then accepts modifications from any CCN interface or module (with the proper authority), as well as from the CVC. The PIC II uses the CCN time schedule to deter- mine start and stop times. ALARMS AND ALERTS — An alarm shuts down the com- pressor. An alert does not shut down the compressor, but it no- tifies the operator that an unusual condition has occurred. An alarm (*) or alert (!) is indicated on the STATUS screens on the far right field of the CVC display screen. Alarms are indicated when the control center alarm light (!) flashes. The primary alarm message is displayed on the default screen. An additional, secondary message and troubleshooting information are sent to the ALARM HISTORY table. When an alarm is detected, the CVC default screen will freeze (stop updating) at the time of alarm. The freeze enables the operator to view the chiller conditions at the time of alarm. The STATUS tables will show the updated information. Once all alarms have been cleared (by pressing the RESET soft- key), the default CVC screen will return to normal operation. CVC MENU ITEMS — To perform any of the operations de- scribed below, the PIC II must be powered up and have suc- cessfully completed its self test. The self test takes place auto- matically, after power-up. Press the MENU softkey to view the list of menu struc- tures: STATUS , SCHEDULE , SETPOINT , and SERVICE . • The STATUS menu allows viewing and limited calibra- tion or modification of control points and sensors, relays and contacts, and the options board. • The SCHEDULE menu allows viewing and modifica- tion of the local and CCN time schedules and Ice Build time schedules. • The SETPOINT menu allows set point adjustments, such as the entering chilled water and leaving chilled water set points. • The SERVICE menu can be used to view or modify information on the Alarm History, Control Test, Control Algorithm Status, Equipment Configuration, ISM Starter Configuration data, Equipment Service, Time and Date, Attach to Network Device, Log Out of Net- work Device, and CVC Configuration screens. For more information on the menu structures, refer to Fig. 17. PRIMARY STATUS MESSAGE SECONDARY STATUS MESSAGE ALARM LIGHT (ILLUMINATED WHEN POWER ON) •BLINKS CONTINUOUSLY ON FOR AN ALARM • BLINKS ONCE TO CONFIRM A STOP STOP BUTTON •HOLD FOR ONE SECOND TO STOP COMPRESSOR ON TIME DATE TIME RUNNING TEMP CONTROL LEAVING CHILLED WATER 01-01-95 11:48 28.8 HOURS EVAP REF 40.7 COND REF 98.1 AMPS % 93 MENU CHW IN 55.1 CDW IN 85.0 OIL PRESS 21.8 CCN CHW OUT 44.1 CDW OUT 95.0 OIL TEMP 132.9 LOCAL RESET SOFT KEYS EACH KEY'S FUNCTION IS DEFINED BY THE MENU DESCRIPTION ON MENU LINE ABOVE MENU LINE Fig. 14 — CVC Default Screen 19XR_II SERVICE ALARM HISTORY CONTROL TEST CONTROL ALGORITHM STATUS EQUIPMENT CONFIGURATION ISM (STARTER) CONFIGURATION DATA EQUIPMENT SERVICE TIME AND DATE ATTACH TO NETWORK DEVICE LOG OUT OF DEVICE CVC CONFIGURATION Fig. 15 — CVC Service Screen Press the softkey that corresponds to the menu structure to be viewed: STATUS SCHEDULE , SETPOINT , or SERVICE . To view or change parameters within any of these menu structures, use the NEXT and PREVIOUS softkeys to scroll down to the desired item or table. Use the SELECT softkey to select that item. The softkey choices that then appear depend on the selected table or menu. The softkey choices and their functions are described below. BASIC CVC OPERATIONS (Using the Softkeys) — To perform any of the operations described below, the PIC II must be powered up and have successfully completed its self test. 15PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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