EVCO EC6708 - Manual (Page 15)

Every Control S.r.l.
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15
pressure digital input
• the parameter AA0 establishes the hysteresis (differential) rela-
tive to the alarm setpoint
• the parameter AA1 establishes the alarm setpoint value
• the parameter AA4 establishes the kind of lower pressure alarm
that the instrument must manage
• the parameter AA7 establishes the time that disables a lower
pressure alarm activation from the moment in which the lower
pressure alarm happens
• the parameter AAn establishes the number of lower pressure
alarms enough to give the instrument locking
• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared
the parameters i8P, AA0, AA1, AA4, AA7, AAn and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.
UPPER PRESSURE ALARM
When the pressure read by the suction probe rises above the alarm
setpoint the instrument activates the upper pressure alarm (see the
paragraph Alarms on the page 46) and it increases an upper pressure
alarms counter as long as the number of upper pressure alarms enough
to give the instrument locking gets reached; to unlock the instrument
turn off and turn on again the instrument.
The parameter Ab4 establishes the kind of upper pressure alarm that
the instrument must manage: the upper pressure alarm never gets
activated, absolute upper pressure alarm (in this case the instrument
activates the upper pressure alarm when the pressure read by the
suction probe rises above the alarm setpoint) ...
FUNCTIONING
Lower pressure alarm - Upper pressure alarm - Upper condensing quantity alarm
... or upper pressure alarm relative to the working setpoint (in this case
the instrument activates the upper pressure alarm when the pressure
read by the suction probe rises above the working setpoint of the
alarm setpoint value).
Speaking of upper pressure alarms
• the parameter Ab0 establishes the hysteresis (differential) rela-
tive to the alarm setpoint
• the parameter Ab1 establishes the alarm setpoint value
• the parameter Ab4 establishes the upper pressure alarm that
the instrument must manage
• the parameter Ab7 establishes the time that disables an upper
pressure alarm activation from the moment in which the up-
per pressure alarm happens
• the parameter Abn establishes the number of upper pressure
alarms enough to give the instrument locking
• the parameter A 3 establishes the time that disables an upper
pressure alarm activation from the moment of the instrument
start
• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared
the parameters Ab0, Ab1, Ab4, Ab7, Abn, A 3 and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.
UPPER CONDENSING QUANTITY ALARM
When the quantity read by the condensing probe rises above the
alarm setpoint the instrument activates the upper condensing quantity
alarm (see the paragraph Alarms on the page 46) and it increases an