54 C4 Manual Rev 7.5.2
encountering the loop statement in step 7, then steps 1-6 will already have been
executed once and then again 5 more times as a function of the loop, for a total of
6 times.
6.8.2 External Compressor On
When the Probe (substep 4) is specified as 4, the program step turns the
refrigeration compressor control port on. Substeps 0 - 2 are ignored. Upon power
up, start and stop of program execution, and changing of the mode switch, this
port will be off. The REFER LED on the front panel will indicate when this port is
on or off.
6.8.3 External Compressor Off
When the Probe (substep 4) is specified as 5, the program step turns the
refrigeration compressor control port off. Substeps 0 - 2 are ignored. Off is the
default mode for this port upon power up, start and stop of program and changing
the rotary switch. The REFER LED on the front panel will indicate when this port
is on or off.
6.8.4 Optional Aux/Power Control Port On
When the Probe (substep 4) is specified as 6, the program step turns the optional
aux/power control port on. Substeps 0 - 2 are ignored. Upon power up and
changing of the mode switch, this port will be on. At start and end of program
execution, this port will be automatically set to off.
For special order chambers or platforms equipped with optional solid state relay
to control main power, this command must be used once at the beginning of a
program in order to turn the chamber or platform on. Note that because this
control will disable all power to a chamber with solid state relay chamber power
control, the normal continuous running of the air circulation fans is disabled
regardless of the state of the Blower Shutoff Mode setup parameter.
Note that mechanically refrigerated chambers or platforms with cryogenic coolant
boost use the Aux/Power Port to control the availability of the cryogenic boost
system. Because the port will be turned off at the start of any program, cryogenic
boost cooling will only be available if this port is turned on.
6.8.5 Optional Aux/Power Control Port Off