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SP2 OPERATING PARAMETERS

The SP2 parameters can be configured in a variety of ways. In the Model 518

temperature controller, the SP2 parameters are used to tailor the cooling system

output for best temperature control.

The SP2 parameters are all shown in °C.

SET.2 – (0.0) Setpoint 2 allows the user to create a setpoint offset for the cooling

system. It is generally not used for the Gas Cooling System. When a

thermoelectric cooler or refrigerated cooling system is used, this setting may be

increased or decreased to determine the point at which the cooling system will

activate. (These systems are operated in On/Off mode instead of within a

proportional band.)

bnd.2 – (1.0) Band 2 should generally be equal to bAnd. The heating and

cooling system will work within the same proportional band, helping to prevent

overlap in the system’s operation. (i.e., the cooling system will have a tendency

to stay ‘off’ when only heating is needed and vice versa).

When a thermoelectric cooler or refrigerated cooling system is used, this setting

may be increased or decreased to determine the point at which the cooling

system will activate. (These systems are operated in On/Off mode instead of

within a proportional band.)

CyC.2 – (3.0) Recommended. Cycle time means how often the unit can

potentially be turned on and then off in succession. 3.0 SECONDS is the

recommended cycle time for the ETS Model 563 Cooling System to achieve

good control and extended valve life. The ETS Model 563 solenoid valve CyC.2

may be set as low as 0.5 second, but short times will accelerate valve wear. DO

NOT DECREASE THE CyC.2 BELOW 0.5 SECOND when operating this

system. The cycle time may be increased above 3.0 seconds to extend valve

life but control may suffer. If using any other cooling system determine the

minimum cycle time at which the unit can safely operate (consult the

manufacturer’s instructions for the unit).

NOTE: All functions in Level 2, 3, & 4 may be “locked” so that

they may not be altered unless “unlocked”. See section 4.4.5

(Level 4).

5.3.4 LEVL 2 (Level 2)

Level 2 is the controller configuration level. The controller is capable of being

configured in an unlimited number of ways. However, the parameters needed to

control the temperature operating systems, with the ETS Model 554 Temperature

Sensor, are programmed and locked.

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