A. Procedures and Rules for Shift People
Rules:
Changing of cooling or interlock system parameters is only permissible by a system expert, or through direct consultation and approval of a system expert (see Section 8 for a list of System Experts).
Responding to Silicon problems:
We will have in place three severity levels that alert shift crew of some problems with the silicon system. The first two are WARNINGS and ALARMS, and are posted in the Alarm summary window for SVX, ISL or L00. The last, and most severe is a PLC trip, which generally shuts down parts of the cooling system or silicon power supplies. The aim is to minimize detector down time by addressing WARNINGS and ALARMS before reaching a TRIP level. Here we describe briefly these alerts, and the course of action.
1. WARNING: These alarms indicate that a parameter is not within the expected range, however, it is not something that needs immediate attention. The course of action is to contact a system expert as soon as possible, but no need to wake someone up in the middle of the night. Generally, these types of alerts can wait 8-12 hours to be addressed. The shift person must record this WARNING in the E-LOG and see to it that the system expert is notified.
2. ALARM: In this case, the parameter has gone far out of the range, and is approaching the TRIP level. The shift person should immediately make an entry in the shift E-LOG and then immediately contact a system expert (even if in the middle of the night). The SCICO may change iFix cooling system parameters through direct consultation with the system expert. Alternately, the system expert may advise the SCICO to acknowledge the alarm and continue running. In most circumstances, the system expert will need to be present to diagnose the cause for the alarm and rectify the situation. In either case, a full summary of the problem and the actions taken MUST be recorded in the shift E-LOG.
3. TRIP: In this case, a portion of the detector has been deactivated because a potential unsafe state has been detected by the PLC Interlock logic. First, the shift person must make an E-LOG entry for the TRIP. Next, the system expert should be contacted by the SCICO (regardless of time). A PS trip will cause the audio alarms in the control room. One may acknowledge these alarms via the switch below. In the case of a PS trip, the PS's should be inhibited through iFix. This is done by going to the "Interlock Trips" page for the offending system (SVX/L00 or ISL) and clicking on the Enabled button. The button should then read Disabled. Once this is done, the audio alarms may be reactivated. The system expert must come in and diagnose the cause of the trip and rectify it. A full summary of the problem and the actions taken MUST be recorded in the shift E-LOG. After the problem has been fixed, the CAEN PS's may be turned back on by a qualified PS system expert.
During initial startup of the silicon detectors, we imagine TRIPS could occur because of trip limits being too conservative for example, and such problems would require modifications to the Interlock code. Only qualified Interlock code experts may make these changes in accordance with the Procedures for Validating and Modifying Interlock Code that is described in Part B below.
Alarms and Trips "Experts"
- these are people who should be contacted in case of
an Interlock Trip or Alarm.
Name Work Home Pager Email
Steve Blusk x8406 482-9103 218-8626 blusk@fnal.gov
Mircea Coca x8406 836-9495 - cmircea@fnal.gov
Andy Hocker x8622 (312)-274-0198 266-2713 hocker@fnal.gov
iFix Cooling/Interlock "Experts"
- these are people who may download values from iFix
Name Work Home Pager Email
Steve Blusk x8406 482-9103 218-8626 blusk@fnal.gov
Rich Stanek x3519 722-1180 rstanek@fnal.gov
Mircea Coca x8406 836-9495 - cmircea@fnal.gov
Andy Hocker x8622 (312)-274-0198 266-2713 hocker@fnal.gov
Interlock Code Experts
- these are people who are permitted to open Softshop to look
at/modify Interlock code
Steve Blusk x8406 482-9103 218-8626 blusk@fnal.gov
Mircea Coca x8406 836-9495 - cmircea@fnal.gov
Andy Hocker x8622 (312)-274-0198 266-2713 hocker@fnal.gov
iFix Graphics Experts
- these are people who are permitted to modify graphics pages
related to the silicon system.
Steve Blusk x8406 482-9103 218-8626 blusk@fnal.gov
Mircea Coca x8406 836-9495 - cmircea@fnal.gov
Andy Hocker x8622 (312)-274-0198 266-2713 hocker@fnal.gov
During commissioning of the silicon detector, we will need to test that each wedge is functioning properly. To do this, we will need to power and readout each wedge after connecting its power and control cables. This process inherently implies that the plugs are open and the environment is not sufficiently dry to run the coolant at -10C. Attempting to do so will result in the interlocks being tripped, which would inhibit the delivery of coolant to the silicon systems. Having anticipated this situation, we have provided a mechanism by which one can power and test the silicon wedges using a higher coolant temperature.
The operator should note that the temperature trip point may be set as high as 15C, but no higher. This maximum limit is enforced in the interlock code that resides in the PLC, so you cannot override this limit. This temperature trip point is downloaded from iFix under the Silicon Systems menus.
Important notes:
1. Downloading a new temperature limit will result in the flow control valves at the detector manifold to be closed.
2. The chiller set point must be above 0C in order for this to work. You should confirm that the temperatures TE_CHSUP and TE_LINESUP are above 0 C. These can be found on the Cooling System Page for SVX/L00 and ISL.
To run at a higher coolant temperature for SVX and/or L00 (ISL):
1. From the Main CDF Menu --> Silicon Menu.
2. Click on SVX (ISL) System Button.
3. Click on Flow Loops and make sure that all flow valves are closed (set to 0%). If they are not closed, close all of them, but leave the detector bypass valve open.
4. Click the SVX (ISL) Trip Temp. button.
5. Under SVX or L00, enter the new temperature limits into the Setablet Limits field. For SVX there are 3 numbers, one for the bulkhead temperatures (BH), one for the DOIM ring, and one for the DDR ring. For L00, there are two temperature limits, one for the silicon and one for the hybrids. For ISL there are two temperature limits, one for the hybrid cooling circuits (CC) and one for the port card rings (CPC).
6. They can all be set to the same or different values as necessary. Wait until the number you type in is displayed in that field. It may take a few seconds.
7. After the set value reads the number you typed in, you may click Download to download the new temperature limits to the PLC. The new limits should appear in the Current Limits field.
8. You now may return to the Flow Loops page, and click on Download to restore the default flow rates to the silicon system.
2/27/01 S. Blusk