Polycold Cryochiller Interfacing
Installation and Operation Manual 24V DI/DO Remote Interface
Brooks Automation
214072 Revision B
5-17
24V DI/DO Remote Interface
The optional 24V DI/DO interface connection allows for direct wiring for inputs to and outputs from the
Polycold Cryochiller similar to earlier PFC models.
The 24V DI/DO may be Isolated or Non-Isolated. Both isolated and non-isolated can control Single Cir-
cuit or Dual Circuit systems. See System Operational State Commands on page 7-16.
24V DI/DO Remote pins are either incoming commands or outgoing data.
• Incoming command lines carry control signals from the remote user to the Polycold Cryochiller.
• Incoming command lines are referred to as “Operate”.
• Outgoing data information lines send data from the Polycold Cryochiller to the remote user.
• Output data lines are either active or inactive.
• MaxCool Cryochiller Remote provides 2 set point relays instead of optional on the PFC.
• MaxCool Cryochiller Remote provides 1.2A maximum to power external devices.
• MaxCool Cryochiller Remote Interface does not support outgoing analog temperature signals.
• The Indicate Remote signal on the PFC goes away when in Remote mode when the compres-
sor is off. On the MaxCool Cryochiller, this signal stays on.
• This behavior is configurable in v1.4.0.3 and above by command
LEGACY_REMOTE,COMP_SIGNAL_LOGIC or from HMI -> Top Menu -> Configuration ->
Set Comm Params -> Legacy Remote -> Comp Signal Logic.
• Default behavior in v1.4.0.3 is PFC backward compatible when v1.4.0.3 is installed. Users
will see a change from the previous MaxCool behavior. In v1.4.0.3, jumping Pins 1/2 is not
necessary as this function is controlled by software.
• Remote compressor on/off is supported by the MaxCool using pins 1 and 2.
• Connect a switch or relay contact set to pins 1 and 2 to remotely control the compressor.
• Connect a jumper between pins 1 and 2 to bypass the remote compressor control.
• Customers who used J11 with a PFC unit must add a jumper between pins 1 and 2 on their
side of the 37 pin connector. See also Remote EMO Connector Wiring on page 12-7.
• This behavior is configurable in v1.4.0.3 and above by command
LEGACY_REMOTE,COMP_SIGNAL_LOGIC or from HMI -> Top Menu -> Configuration ->
Set Comm Params -> Legacy Remote -> Comp Signal Logic.
• Default behavior in v1.4.0.3 is PFC backward compatible when v1.4.0.3 is installed. Users
will see a change from the previous MaxCool behavior. In v1.4.0.3, jumping Pins 1/2 is not
necessary as this function is controlled by software.
• When both COOL and DEFROST Legacy Remote signals are High, early PFC behavior was to
put unit in Cool Mode. Original MaxCool behavior put unit in Standby Mode.
• This behavior is configurable in V1.4.0.3 and above by command
LEGACY_REMOTE,OP_MODE_LOGIC or from HMI -> Top Menu -> Configuration -> Set
Comm Params -> Legacy Remote -> Op Mode Logic.
• Default behavior in v1.4.0.3 is PFC backward compatible when v1.4.0.3 is installed. Users
will see a change from the previous MaxCool behavior.
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