Programming and Operation
3-62
P/N 8040406
C
HELIX TECHNOLOGY CORPORATION
-
TI
CRYOGENICS
RELAYS Function Operation
Only one Relay parameter can be in control of the relay at anytime. Once a
Relay parameter has been programmed, your selected relay will be placed
in automatic mode as indicated by the FNC = CRYOPUMP
message. FNC is an abbreviation for Function and the message indicates
the relay will be activated when the cryopump motor is turned ON. The
previously programmed relay parameter (if one exists) will be cancelled.
The FNC = MANUAL OFF message indicates that none of the Relay
parameters have been programmed.
Use the following procedures to program the Relay parameters of the
On-Board FastRegen Control Module.
NOTE: Relay activation/deactivation is dependent upon the manner in
which the relays are wired, normally open or normally closed.
Programming First Stage Temperature Limits
This procedure programs relay 1 or 2 to activate/deactivate when either of
the cryopump first stage temperature limits are reached.
1. Press the RELAYS key on the keypad/display.
2. Press 1 or 2 depending upon which relay is being selected. The
selected relay number along with the ON/OFF and Auto/Manual
status are displayed.
3. Press the Next key until the 1st Stage Temperature is displayed.
4. Press the Enter key. The cursor is placed under the current lower
limit (LL) value.
NOTE: If a number which is not in the proper range is entered, LL-???K
or UL-???K will be displayed. Press the Clear button to continue.
5. Using the keypad, enter the new lower limit value.
6. Press the Enter key. The cursor is placed under the current upper
limit (UL) value.
7. Using the keypad, enter the new upper limit value.
8. Press the Enter key. The limit values are programmed.
9. Press the MONITOR key. The On-Board microprocessor will
monitor system operation.
