User manual

58 - URDR0001 - User manual
Lower Deviation Alarm (L. d . AL. selection)
Pv
Comand Spv
Alarm Spv
O O
On On
Hysteresis
parameter
 > 0
Time
Alarm
output
Lower deviation alarm value of
alarm setpoint greater than “0”
and hysteresis value greater than
“0” (par. 28
A.1.HY. > 0).
NB
11
Pv
Comand Spv
Alarm Spv
O O
On On
Hysteresis
parameter
 > 0
Time
Alarm
output
Lower deviation alarm value of
alarm setpoint less than “0” and
hysteresis value greater than “0”
(par. 28
A.1.HY. > 0).
NB
11
11
a) The example refers to alarm 1; the function can also be enabled for alarms 2 and 3 on
models that include it.
b) With hysteresis value less than “0” ( A.1.HY. < 0) the broken line moves under the
alarm setpoint.