GE MN-ValVue-v2-8-IOM Manual de Serviço Página 538

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ValVue Digital Communications Software Ver. 2.80
538
GE Oil & Gas
Low Setpoint/High Setpoint Controller low/high setpoint values corresponding to the low/high
level or interface values (set in calibration parameters). If the setpoint
unit is:
The same as the level or interface unit, the controller low/high
setpoint values must be the same as the low/ high level or
interface values.
Not the same as the level or interface unit, the controller low/
high setpoint values can be different from the level or
interface values. In this case you must activate a ratio control
flag to force the controller to define the transformation
function to level units.
Initial Setpoint On startup, the controller setpoint is set with the initial setpoint value.
Setpoint Units Engineering units of the controller setpoint. If the setpoint units are
not the same as the level or interface unit, then the ratio control flag
must be activated and the ratio gain/ratio bias value calculated
properly using setpoint low/high values versus low/high level or
interface values. The transformation function is:
Setpoint in level/interface unit = ratio gain * Setpoint in its unit + ratio
bias.
Controller Rate Determines how often the controller calculates the output signal.
The value must be set between 0.2s and 20s.
Alarms and Failsafe
Low Alarm (in)/High Alarm
(in)
If the Low Alarm box is selected and the level or the interface of liq-
uid is lower than the low alarm value for more than the Time 1 value
in seconds, the low alarm is set.
If High Alarm box is selected and the level or the interface of liquid is
greater than the high alarm value for more than the Time 1 value in
seconds, the high alarm is set.
Time 1 (sec)/ Time 2 (sec) If either High or Low Alarm box is selected and the level or the inter-
face of liquid is outside of the alarms ranges for more than Time 1,
then the alarm is set. If the level remains outside of the alarms
ranges for more than Time 2, then the HDLT is set to failsafe mode.
If either Time 1 or Time 2 are set to a negative number this is under-
stood by the HDLT as not used.
Time 2 must be greater than Time 1. The maximum time value is
1000 seconds.
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