Emerson Vilter VilTech Operation And Service Manual page 128

Sequencer Control
The sequencer control screen allows the operator to enable or disable the sequencer. If process
temperature is an option, it may also be selected from this screen.
Sequencer Control Screen
Sequencer Setpoints
On the next page is an example of a sequencer control setpoints screen. If the sequencer can use
multiple system control parameters, a menu will allow selection of control setpoints for each param-
eter.
The standby monitor timer is used to limit compressor starts after lead list changes or when previously failed
compressors are brought back on-line. The Sequencer Control Setpoints screen is divided into four areas.
The Sequencer Controls section at the top controls how the sequencer decides when to start or stop
compressors. The Compressor Controls section in the center is passed to the Trim Compressor to allow it to
load and unload at a different rate than the Sequencer. At the bottom of the screen is the Standby Monitor
timer and an optional setpoint for use in two-stage refrigeration systems. The Reference Data on the right
is dynamically updated while the user if changing setpoints.
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