Configuration Polycold Cryochiller
External Vacuum Control Installation and Operation Manual
Brooks Automation
8-4
214072 Revision B
External Vacuum Control
Allows external vacuum devices to change the Polycold Cryochiller’s operating mode from Standby to
Cool.
When the circuit is in standby and the external vacuum control is enabled, a 24V signal (AC or DC)
applied to the designated contacts on the 4-pin Gauge Relay port will be detected and cause the unit
to switch to cool.
See Gauge Relay (J4) on page 5-3 for more information on the use of this feature.
• EXT_VAC_CONTACT,1,?P gets the enable/disable status of the circuit 1 Gauge Relay
control.
• EXT_VAC_CONTACT,1,1P enables the Gauge Relay input to be used for circuit 1.
Set Point Relays
All Polycold Cryochillers models equipped with the 24V DI/DO 37 pin interface include this feature. Set-
point relays are outputs that are enabled or disabled by the status of programmable parameters.
A user can configure the behavior of these two relays via software. This allows the user to select the
sensor to be associated with each relay, the set point, deadband and relay logic.
See 24V DI/DO Remote Interface on page 5-17 for more information on the use of this feature.
• SETPOINT_RELAY,1,?P gets the external vacuum device setpoint for Relay 1.
• SETPOINT_RELAY,2,3,1,-30,5P sets the Relay 2 external setpoint to monitor sensor
Circuit1_CoilInTemp and close relay below -30 C with 5º C of dead band which means the
relay opens at -25º C.
Remote Control Methods
The Polycold Cryochillers may be controlled remotely by RS232 or Ethernet or other interfaces. Once
in remote control, system commands may be sent to configure or control the unit.
Commands for remote control are as follows:
• SYSTEM_CONTROL_MODE,2P sets the system to the mode designated by the value
sent by this command, in this case, RS232.
RS232 and Ethernet can set the control and take control using this command. Other
remote interfaces can only set the control when they are in control.
• SYSTEM_CONTROL_MODE_DEF sets the default system control mode that the system
is set to on startup and that the unit goes to when the Remote key is pressed to set the unit
to remote mode.
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