8. Equipment Protection System (EPS)

The equipment protection system (EPS) protects the components of the undulator beamline 6ID of damage by monitoring the state of all necessary components. Most of the components belong to the 6ID-B Main Station or both stations. In this chapter only a brief overview of the components of the side station which are protected by the EPS is given. The EPS itself should only be operated by staff personnal therefore this chapter is not intended to give an introduction.

Table 8.1: List of the inputs for the EPS. The first row shows the internal number of the inputs used by the EPS Computer. The input controller used for the 6ID-D Side Station equipment has 32 channels, the channels used are shown in the second row.

I:7/0	0	Filter Position	Filter Position
I:7/1	1	Love Controller 1	Water cooling filter
I:7/2	2	Love Controller 2	Water cooling mask
I:7/3	3	Love Controller 3	Water cooling Monochromator crystal 1
I:7/4	4	Love Controller 4	Temperature downstream side of white beam mask
I:7/5	5	pressure gauge 1	pressure monochromator tank 1
I:7/6	6	pressure gauge 2	not used
I:7/7	7	pressure gauge 3	pressure monochromator tank 3

In the moment there are seven inputs to the EPS from the sidestation as listed in table 8.1.

• The filter position is checked to prohibit the white beam hitting and melting pieces of the filter changer. Whenever the filters are moved (Warning! This is only permitted while the beamshutter is closed) the EPS will trigger an alarm and therefore has to be reset afterwords. This will be changed in future program versions. In case of an alarm the beamshutter will be closed.
• The water flow rates of the cooling of the white beam mask, filter and first monochromator crystal are monitored. In case of an alarm the beamshutter will be closed.
• The pressure of the first monochromator tank is monitored. In case of an alarm the valves around the first monochromator tank will be closed. This automatically triggers the closing of the beamshutter.
• The pressure of the second monochromator tanl is monitored. A vacuum leak in the second monochromator tank may cause problems with the movement of the second monochromator chamber because the flexible bellows connected to the second monochromator chamber might be damaged in that case. Therefore, the beamshutter is closed to alarm the operator.

Table 8.2: Internally used binary registers by the EPS computer.

B3:8/5	B3/133	fault_love_side_1
B3:8/6	B3/134	fault_love_side_2
B3:8/7	B3/135	fault_love_side_3
B3:8/8	B3/136	fault_love_side_4
B3:2/8	B3/040	IG5_A_Fault
B3:2/9	B3/041	Fault_Vac_side_2
B3:1/4	B3/020	Filter_Fault

The tables 8.2 and 8.3 are included for completeness for the case that changes to the EPS program have to be made by staff personal.

Table 8.3: Internally used output registers by the EPS computer.

O:5.1/08	O:5/024	Fault_love_S1_live
O:5.1/09	O:5/025	Fault_love_S1_latch
O:5.1/10	O:5/026	Fault_love_S2_live
O:5.1/11	O:5/027	Fault_love_S2_latch
O:5.1/12	O:5/028	Fault_love_S3_live
O:5.1/13	O:5/029	Fault_love_S3_latch
O:5.7/10	O:5/122	Fault_filter_live
O:5.7/11	O:5/123	Fault_filter_latch
O:5.7/12	O:5/124	IG5_A_Fault_live
O:5.7/13	O:5/125	IG5_A_Fault_latch
O:5.7/14	O:5/126	Fault_vac_side2_live
O:5.7/15	O:5/127	Fault_vac_side2_latch