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Zenex Plus User Manual
FACTORY ALARM PARAMETERS
Parameter Description
Settings
(Default Value)
This parameter sets a differential (dead) band between the ON
and OFF Alarm status change. Keep it large enough to avoid
frequent switching of the Alarm Status/Relay.
HYSTERESIS >>
(Default : 0.2)
0.1 to 99.9
Yes
The Alarm activation is suppressed until the Temperature value is
within Alarm limits from the time the controller is switched ON. This
allows suppressing the Alarm during the start-up Alarm
conditions.
No
The Alarm is not suppressed during the start-up Alarm conditions.
INHIBIT >>
(Default : YES)
YES
NO
FACTORY
The PPI “Multi-Purpuse Temperature Controller” provides control outputs for driving, both, heating & cooling sources. The
user can enable any one or both outputs depending upon the test equipment type and application. If both outputs are enabled
(by setting the parameter ‘Control Strategy’ to Heat + Cool) and if the cooling source is compressor then the controller offers
various strategies for switching the compressor as described below.
Compressor Switching Strategies
1. Compressor Off
The compressor is kept Off. This strategy is usually selected for temperature values significantly above the ambient
temperature.
2. Compressor On
The compressor is kept On regardless of the measured or set temperature value. This strategy is usually selected for
temperature values significantly below the ambient temperature.
3. SP Based Strategy
In this strategy, the chamber temperature range is split in two zones by setting the parameter 'Boundary Set-point' (BSP).
Refer Figure 5.2.
HEAT COOL SELECT
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