Interlocks
==========

The FastCCD needs pretty stringent interlocks, both on temperature and
pressure. The tmperature interlocks are realized in hardware using a Lakeshore
controller. Basically, if the temperature gets to high, we need to switch off
the camera, if it gets too low, we switch off the chiller.

The pressure interlocks are switching off both the camera and the chiller,
to avoid ice build-up. The relays switching the camera and chiller are
intuitively called CHREL and CSREL, respectively.

.. conditions loop7 SCS_CDIDET_FCCD2M/DCTRL/WS_CHREL2 SCS_CDIDET_FCCD2M/DCTRL/WS_CSREL1

====== ======================================== ======== =====
Number Device Parameter                         Operator Limit
====== ======================================== ======== =====
c1     SCS_CDIDET_FCCD2M/GAUGE/PCC20.Value      GT       1e-3
c2     SCS_CDIDET_FCCD2M/TPUMP/TP1.state.RPM80  EQ       FALSE
c3     SCS_CDIDET_FCCD2M/TPUMP/TP2.state.RPM80  EQ       FALSE
c4     SCS_CDIDET_FCCD2M/VALVE/GV1.state.IsOpen EQ       FALSE
c5     SCS_CDIDET_FCCD2M/VALVE/GV2.state.IsOpen EQ       FALSE
====== ======================================== ======== =====

.. actions loop7 SCS_CDIDET_FCCD2M/DCTRL/WS_CHREL2 SCS_CDIDET_FCCD2M/DCTRL/WS_CSREL1

====== ========================== ======
Number Logic                      Action
====== ========================== ======
a1     c1 or c2 or c3 or c4 or c5 COff
====== ========================== ======

Vacuum
------

The vacuum system is shared with the TIM, which makes things a bit
more complicated. If the FastCCD is vented, we better do not open the
roughing valve unless TIM's roughing valve is closed as well.

We use the turbo pump being running as an indicator that our vacuum is
fine.

.. conditions loop7 SCS_CDIDET_FCCD2M/VALVE/SRV2 SCS_CDIDET_FCCD2M/DCTRL/SRV2

== ======================================= == =====
No Property                                Op Value
== ======================================= == =====
c1 SCS_CDIDET_FCCD2M/GAUGE/P9.Value        GT 0.05
c2 SCS_BLD_TIM/VALVE/SRV3.state.IsClosed   EQ FALSE
c3 SCS_CDIDET_FCCD2M/TPUMP/TP1.state.RPM80 EQ FALSE
c4 SCS_CDIDET_FCCD2M/TPUMP/TP2.state.RPM80 EQ FALSE
== ======================================= == =====

.. actions loop7 SCS_CDIDET_FCCD2M/VALVE/SRV2

== ======================== ======
No Logic                    Action
== ======================== ======
a1 c1 or (c2 and c3 and c4) CClose
== ======================== ======

.. actions loop7 SCS_CDIDET_FCCD2M/DCTRL/SRV2

== ======================== ======
No Logic                    Action
== ======================== ======
a1 c1 or (c2 and c3 and c4) COff
== ======================== ======

Like always, if the turbo pumps fail, their gate valve should close.
There is the same pumping down exception as for the DPS.

.. conditions loop7 SCS_CDIDET_FCCD2M/VALVE/GV1

== ======================================= == ===== ==== =======
No Property                                Op Value Hyst Timeout
== ======================================= == ===== ==== =======
c1 SCS_CDIDET_FCCD2M/TPUMP/TP1.state.RPM80 EQ FALSE
c2 SCS_CDIDET_FCCD2M/GAUGE/PCC20.value     LT 1e-4  1    100000
== ======================================= == ===== ==== =======

.. conditions loop7 SCS_CDIDET_FCCD2M/VALVE/GV2

== ======================================= == ===== ==== =======
No Property                                Op Value Hyst Timeout
== ======================================= == ===== ==== =======
c1 SCS_CDIDET_FCCD2M/TPUMP/TP2.state.RPM80 EQ FALSE
c2 SCS_CDIDET_FCCD2M/GAUGE/PCC20.value     LT 1e-4  1    100000
== ======================================= == ===== ==== =======

.. actions loop7 SCS_CDIDET_FCCD2M/VALVE/GV1 SCS_CDIDET_FCCD2M/VALVE/GV2

== ========= ======
No Logic     Action
== ========= ======
a1 c1 and c2 CClose
== ========= ======