32
Procedure: Decreasing the scroll delay value will cause the information on the display to scroll
faster. Increasing the scroll delay value will cause the information on the display to scroll slower.
3.7 Temperature Alarms
This section defines the temperature-related alarming functions of the 920 controller. These
parameters must be set up individually for both Point A and Point B.
3.7.1 TEMPERATURE SENSOR 1 FAILURE ALARM
Purpose: Enabling
TS 1 FAILURE will provide indication of an open or shorted failure of TS 1.
Alarm Mask: ENABLE or DISABLE
Procedure: Enable or disable alarming of a failed first temperature sensor (TS 1) as required.
Notes:
• This failure alarm should be enabled if a temperature sensor is connected to the
TS 1 input.
• This alarm is always latched and must be reset by the user.
3.7.2 LOW TEMPERATURE SENSOR 1 ALARM
Purpose: If enabled, the
LOW TS 1 ALARM allows for alarming of low temperature conditions as
sensed by the first temperature sensor (
TS 1).
Alarm Mask: ENABLE or DISABLE
Range: –76°F to 1058°F (–60°C to 570°C)
Procedure: Adjust the LOW TS 1 ALARM temperature setpoint to the desired value. Note that the
LOW TS 1 ALARM must be enabled in order to adjust the LOW TS 1 ALARM temperature setpoint.
Notes:
• This alarm should normally be enabled and the setpoint should be appropriate for the heating
application. Maintaining a minimum 5°C differential between low temperature alarming and
the
CONTROL SETPOINT temperature will minimize nuisance alarming due to momentary dips
in temperature. Another alternative to this is to configure the controller for non-latching tem-
perature alarms.
• This alarm must be enabled and its setpoint must be below the
CONTROL SETPOINT tempera-
ture if fail-safe mode uses the temperature from
TS 1.
3.7.3 HIGH TEMPERATURE SENSOR 1 ALARM
Purpose: If enabled, the
HIGH TS 1 ALARM allows for alarming of high temperature conditions as
sensed by the first temperature sensor (TS 1).
Alarm Mask:
ENABLE or DISABLE
Range: –76°F to 1058°F (–60°C to 570°CF)
Procedure: Adjust the HIGH TS 1 ALARM temperature setpoint to the desired value. Note that the
HIGH TS 1 ALARM must be enabled in order to adjust the HIGH TS 1 ALARM temperature setpoint
unless the
TS 1 HIGH LIMIT CUTOUT feature is enabled.
Note: This alarm should only be used for applications involving a product that is sensitive to
over temperature. General use may result in nuisance alarms due to the outflow of hot product
or steam. This may be a case where the alarm should be enabled and nonlatching temperature
alarming used. A high temperature condition resulting from a forced on failure of the heating cir-
cuit should first be alarmed by the
SWITCH FAILURE ALARM. See section 3.8.18 on page 40 for
more information.
3.7.4 TEMPERATURE SENSOR 2 FAILURE ALARM
Purpose: Enabling
TS 2 FAILURE provides indication of an open or shorted failure of TS 2.
Alarm Mask: ENABLE or DISABLE
Procedure: Enable or disable alarming of a failed second temperature sensor (TS 2) as required.
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