Configuration
Polycold Cryochiller
Power Management - Cylinder Unloading
Installation and Operation Manual
Brooks Automation
8-2
214072 Revision B
Power Management - Cylinder Unloading
Cylinder unloading is used to save energy during periods of low cooling load. Cylinder Unloading dis-
ables one of the compressor cylinders which allows for saving a significant amount of energy. Cylinder
Unloading is only available with systems equipped with the power management option.
Key elements of Cylinder Unloading are as follows:
•
Enable the Cylinder Unloading using the E_MGMT_ENABLE command
•
Set a delay before engaging Cylinder Unloading
•
Establish the target temperature to be maintained while unloading is active.
•
Establish a delta which creates a safety margin for the target temperature before engaging
cylinder unloading.
Power Management in Standby Mode
When in Standby mode, if cylinder unloading is enabled, the Cylinder Unloader goes active after a
delay period defined by the command POWER_MGMT_STANDBY_DELAY.
•
E_MGMT_ENABLE,1P
Enables cylinder unloading - ? = get the status, 0 = disable, 1 = enable
•
POWER_MGMT_STANDBY_DELAY,300P
Sets Cylinder Unloader to activate after the system has been in Standby mode for 300 sec-
onds and power management is enabled.
Power Management in Cool Mode
When in the Cool modes of either Standard Cool or Ramp Controlled Cool, a target temperature is used
to define the temperature at which Cylinder Unloading stays active and an additional delta temperature
that must be reached for the Cylinder Unloading to go active.
The typical temperature warming experienced with the cylinder unloader activated varies based on
application conditions. You need to verify and adjust the settings based on the performance of your
application.
•
E_MGMT_ENABLE,1P
Enables cylinder unloading - ? = get the status, 0 = disable, 1 = enable
•
CAPACITY_TARGET_TEMP, -120P
Sets maximum temperature of -120 for Cylinder Unloading to remain active Will only stay
active once per cycle.
•
EXCESS_CAP_TEMP_DELTA,8P
Sets an 8º C delta T value that the temperature must be below
CAPACITY_TARGET_TEMP for Cylinder Unloader to begin.
