Installation manual

Series C Controller Configuration and Operation Manual

8-4  Athena Controls, Inc. 900M050U00

8.2.3 Applying Hysteresis to On/Off Control

Parameter Name

Hysteresis for Output 1

(21) and

Hysteresis for Output 2

(38)

Name as Displayed

HYS.1HYS.1 and HYS.2HYS.2

Used By:

all controllers

When Displayed:

if input type is on/off

Range:

RTD and thermocouple input types: 0 to positive sensor span

linear input types: limited by the scaling defined for the input

using the input menu (See Note 1 below.)

Default:

Description:

The hysteresis value represents a temperature value that the

controller uses to move the “on” and “off” transitions away from

the setpoint by an amount equal to half the configured hysteresis

value.

Note 1: The range is reduced when a linear input is used and the value of the dSPLdSPL

(display) menu dEC.PdEC.P (decimal position) parameter is not 0 (zero). See 4.3.2 for more

information about the effect of a linear input on numerical ranges.

If you are configuring control parameters for an on/off output, you

are finished configuring the control parameters that apply to that

output. The remainder of this section does not apply to on/off

outputs.

If both outputs will be used for control, but control parameters for

only one output have been configured, configure the control

parameters for the second output.

• If you chose on/off for the second output, configure the

deadband and hysteresis for the second output as

described here in 8.2.

• If you chose PID control for the other output, go to 8.3.