Alarm Modes - Chauvin Arnoux STATOP 4850 Manual De Instrucciones

Theoretically, the smaller the cycle time, the better the control. But for a relay output the cycle must be calculated
to optimise the working of the relay. The following table gives the recommended cycle times to avoid premature wear
of the relay.
Type of output(s)
Relay
Logic voltage
Analogue, voltage or current
Note : For ON-OFF control (Pb = 0), adjustment of the cycle time is not applicable.
C.Pb, d-b Cold proportional band, cold dead band. See Ch.3.10 for a detailed description.
If A2 is not used as a second control output, ignore these parameters.

3.5.3. Alarm modes

The instrument has two built-in alarms (A1 and A2). Their behaviour is defined by means of the parameters A1.md and A1.SF
for the first, A2.md and A2.SF for the second. The following description shows the different configurations possible for alarm A1.
The principle is identical for alarm A2.
No special function : A1.SF = nonE
A1MD
d v hi
high gap
alarm
*
SV
Special function Alarm held: A1.SF = LtCh
The alarm output and its indicator are activated when a threshold is crossed. With this function, the alarm remains active even if
the fault disappears and this continues until the power supply of the controller is cut.
Normal cycle time
= Alarm active
A1MD
d v .Lo
low gap
alarm
SV
SV+ASP1
SV+ASP1
*
A1MD
FS.hi
high
absolute
alarm
ASP1
*
Cycle time too long
(oscillations)
Cycle time ( CYC or C.CYC )
Advised : 20 s or more
5 s mini
1...3 s
0.1 s
SV = Setpoint
A1MD
db.hi
high
symmetrical
alarm
SV+
*
SV
SV-
*
A1MD
FS.Lo
absolute
alarm
*
29
Load (resistive)
2 A/ 250 V AC or contactor
1 A / 250 V~
Static relay
Power switches
A1MD
db.Lo
low
symmetrical
alarm
| |
ASP1
*
SV
| |
ASP1
*
low
ASP1
| |
SV+ ASP1
| |
SV- ASP1