The Regeneration Controller is the main unit of the entire cryopumping system, an 8085-based IO- and Relay controller that controls the Helium Compressor,
Enumerated from left to right:
J1: Valve Control
6: Valve V1 (NO)
5: Valve V2 (NO)
4: Valve V3 (NO)
3: Valve V4 (NO)
2: Hi Vac
1: AC Common
All valve control outputs close to 230V AC output.
J2: Heater
1:
2:
3: Sieve Power
J3: Remote Valve Control
6: Valve V1 (NO)
5: Valve V2 (NO)
4: Valve V3 (NO)
3: Valve V4 (NO)
2: Hi Vac
1: Switched AC Common
External OR'ed control of J1 outputs. Switches
J4: Compressor
1: NC
2: Compressor Remote Start
3: Compressor Cooling Interlock
A simple Relay port, pins 2 & 3 get closed to engage the compressor.
J5: Sensor/Remote
1: TC Sig/ Ext. Set 1
2: Room Temp (NO)
3: Regen start (NO)
4: TC Return
5: TC Heater/ Ext. Set 2
6: GND
Minimum operating pressure sensing. Either drives a TC Gauge or can be externally controlled by shorting pins 1 & 5 when setpoint is met. Shorting pin 2 to 6 (GND) tells controller room temp has been met. Shorting pin 3 to 6 for >5s starts a regeneration cycle.
J6: Test
1: ?
2: ?
3: ?
4: ?
5: ?
6: ?
7: ?
8: ?
9: ?
AC Power
230V 1Ph
Temperature Monitor:
The Temperature Monitor reads room and cryopump cold head temperature, compares with setpoints and controls 3 relay outputs from these.
Enumerated from left to right:
J1: Room Temp.
3: NC
2: GND
1: Room Temp. (NO)
Relay output, closure signaling cryopump has reached room temperature.
J2: Low Set.
3: NC
2: Common
1: Low Temp. (NO)
Relay output, closure signaling cryopump low setpoint has been met.
J3: High Set.
3: NC
2: Common
1: HighTemp. (NO)
Relay output, closure signaling regeneration heating temperature has been met.
J4: Digital Out
1: NC
2: Compressor Remote Start
3: Compressor Cooling Switch
A simple Relay port, pins 2 & 3 get closed to engage the compressor.
J5: Sensor
1: ?
2: ?
3: ?
4: ?
Cryopump cold head temperature sensor. Possibly diode/RTD/Hybrid based.
AC Power
230V 1Ph
Helium Compressor Module & Cable Harness:
The cooling system itself, a 2-stage Gifford-McMahon cooler (Wikipedia Article). The helium cooler is a high pressure, low-leakage scroll pump compressing helium between 12.5 Bar and 28 Bar, creating a overpressure in the exit line and vacuum in the return line. It also powers the motor for the 2-stage GM-expansion responsible for the cooling.
Enumerated from left to right:
Circular Connector: Compressor Module
A: ~Lr (AC 3Phase)
B: ~Ln (AC 3Phase)
C: GND (PE)
D: Compressor Cooling Interlock
E: Compressor Remote Common
F: Compressor Remote Start
G: NC
Relay output, closure signaling cryopump has reached room temperature. While E has a Common-function, it is not used in the rack. Interlock and rack are connected in series
Compressor Remote Start
A: Compressor Remote Common
B: NC
C: Compressor Remote Start
Relay Input, shorting pins 3 & 1 turns compressor on.
Valve Control
A: Compressor Cooling Interlock
B: NC
C: Compressor Remote Common
D: NC
Interlock membrane pressure switch, won't turn on unless water pressure and flow rate are at acceptable rates. Connected in series with rack for compressor remote start.