gefran 1600 Manuel D'utilisation page 29

Normal absolute alarm
AL2
AL1
(*)
alarm 1
alarm 2
For AL1 = reverse absolute alarm (low) with positive Hyst1, AL1 t = 1
(*) = OFF if disabled on power-up
For AL2 = direct absolute alarm (high) with negative Hyst2, AL2 t = 0
SP+AL1
SP
reverse
direct
For AL1 = Lo deviation alarm with negative Hyst 1, AL1 t = 3
For AL1 = Hi deviation alarm with negative Hyst 1, AL1 t = 2
This type of alarm requires use of a current transformer input (CT).
It can indicate variations of load current measured through transformer input in the range (Lo.S2 ... HI.S2).
It is enabled by means of configuration code (Hrd, AL.nr); in this case the alarm setpoint is expressed as HB scale points.
The alarm function and the assigned control output are selected through parameter Hb_F ("Out" phase).
The alarm setpoint is AL.Hb.
The direct HB alarm trips if current transformer input falls below the setpoint for Hb_t seconds of ON time for the selected output.
The HB alarm can be activated only with ON times exceeding 0.4 seconds.
The HB alarm monitors load current even during the OFF period of the cycle time of the selected output.
The HB alarm will trip if measured current exceeds 12% of the CT input full scale for Hb_t seconds when the output is in OFF state.
The alarm is reset automatically when alarm conditions have been cleared.
If AL.Hb is set at = 0, both types of HB alarm are disabled and the assigned relay is de-energized.
The load current reading is displayed by selecting InP2 (level 1).
NOTE: ON/OFF times refer to the cycle time set for the selected output.
Alarm Hb_F = 3 (7), for analog output is ON when the load current is lower than the alarm setpoint; the alarm is disabled if the heating (cooling)
output is lower than 2%.
This alarm detects an interruption in the control loop caused by a possible short-circuited probe, inverted probe connections or broken load.
If enabled (AL.nr), the alarm trips if the variable does not increase when heating (reduce when cooling) at maximum power for a set time
(LbA.t).
The value of the variable is enabled only outside the proportional band; when the alarm is ON, power is limited to value (LbA.P).
The alarm condition resets as soon as temperature increases for heating (or reduces for cooling), or by simultaneously pressing the " ∇ " and " ∆ "
keys in Out.P of level 1.
The LBA function is disabled if LbA.t = 0.
This function (if enabled) partializes power in proportion to the time elapsed since power-up compared to the preset time 0.0 ... 500.0 min
("SoFt " parameter, CFG). Soft-start is an alternative to self-tuning and is activated each time the unit is powered up. The soft-start function is
reset by switching to Manual control.
AL2 + Hyst2
AL1 + Hyst1
time
Deviation alarm
Hyst1
time
9 • SOFT-START
8 • ALARMS
AL1
reverse
direct
For AL1 = symmetrical Lo absolute alarm with Hyst1, AL1 t = 5
For AL1 = symmetrical Hi absolute alarm with Hyst1, AL1 t = 4
SP+AL1
SP
SP-AL1
reverse
direct
For AL1 = Symmetrical Lo deviation alarm with Hyst 1, AL1 t = 7
For AL1 = Symmetrical Hi deviation alarm with Hyst 1, AL1 t = 6
HB ALARM
LBA ALARM
29
Symmetrical absolute alarm
AL1 + [ Hyst1 ]
AL1 - [ Hyst1 ]
time
Symmetrical deviation Alarm
time