AUBER INSTRUMENTS
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2021.05
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Table 5. Conditions of Relays Become Active or Inactive.
Relay
Mode
Mashing Mode
Boiling/Distilling Mode
Active
Inactive
Active
Inactive
Process
Alarm
PV < AL or
PV
≥
AH
AL
≤
PV <
AH
PV < AL or
PV > AH
AL < PV <
AH
Deviation
Alarm*
PV
≥
(SV
+ AH), or
PV < (SV -
AL)
(SV - AL)
≤
PV <
(SV + AH)
NA
NA
Acceleration PV < SV**
PV
≥
SV
PV < bAST
PV
≥
bAST
Timer***
PV < tSP,
or Preset
Mashing
Timer (t) is
reached
PV > tSP
PV < btSP, or
Preset Boiling
Timer (bt) is
reached
PV
≥
btSP
Note *: Deviation Alarms are not available in Boiling Mode because there is no
temperature set point.
Note **. The precise turning off point is determined by the AI program.
Note ***: Timer function
tF
should be set to ON if user wants to set Relay 2 to
Timer mode (
RL2
= Time). If timer function
tF
was set of OFF, Relay 2 will remain
active.
Note 13: Lgc (Relay Logic
), determines relay status before and after the alarm
conditions are met. It can be set to Logic Close (
RL-C
) or Logic Open (
RL-O
).
When a relay is set to
RL-C
, the relay is a NO relay, it stays open when it is
inactive; the relay contacts close (pull-in) when alarm conditions are met. When
a relay is set to
RL-O
, the relay is essentially a NC relay, it stays closed when it
is inactive; the relay contacts open up (drop-out) when alarm conditions are met.
For most applications, the relay should be set to Logic Close (
RL-C
), which is
the default setting. The Logic Open (
RL-O
) configuration is useful if user want to
turn on a device when the temperature is not in the alarm zone.
Note 14: LAt (Latching, Pulsing, or Non-Latching Relay Action),
determines
the relay actions when alarm conditions are met and/or then removed. It can be
set to
Y
for Latching Mode,
PUL
for pulsing mode, or
N
for Normal Mode.
When
LAt
is set to
Y
(Latching Mode), the relay action is latched. It will not
release even if the alarm condition is removed. To release the relay, user must
reboot the controller or use the Reset Key to cancel the relay action (see note
20 for details).
When
LAt
is set to
PUL
(Pulsing Mode), the replay action is a timed single pulse.
When the alarm condition is met, relay will be activated only for a pre-determined
period of time. User can set the pulse duration by the
AP
parameter in the menu
of alarm settings; it ranges from 1 to 100 seconds. This feature is useful in
situations where a user only need to ring the buzzer for a short time or want to
drive an external load for a fixed amount of time duration.
When
LAt
it is set to
N
(Non-Latching), the relay action will follow the alarm
condition. The relay stops its action when the alarm condition is removed.
Note 15: SiL (Relay Silence,
also called
Alarm Suppression)
, determines
whether a relay action should be suppressed when controller is just powered up.
When SiL is set to Y, Relay Silence is enabled; when SiL is set to N, Relay
Silence is disabled.
Relay Silence/Alarm Suppression is only supposed to work when: 1) controller
is just powered up, and 2) the condition that deactivates the Relay Silence is not
met yet. This feature is available in all relay modes, however, the deactivation
condition varies.
Table 6. Conditions to Deactivate the Relay Silence/Alarm Suppression.
Relay Mode
Mashing Mode
Boiling Mode
Process Alarm
PV ≥ SV
PV ≥
btSP
Deviation Alarm
PV ≥ SV
NA
Acceleration
PV ≥ SV
Mashing Set Point (SV)
Timer*
NA
NA
For example, if a controller is working in mashing mode and the relay is set as a
process alarm, then alarm suppression will apply to the low limit alarm until the
process temperature reaches the mashing temperature. For another instance, if
a controller is working in boiling/distilling mode, Relay 1
RL1
=
ACC
,
Lgc1
=
LC-
C
,
LAt1
= N
.
If
SiL1
=
N,
Relay 1 should pull-in when
PV
<
bAST
and drop-out
when
PV
>=
bAST
. But when
SiL1
=
Y
, Relay 1 will not be activated when
PV
<
bAST
unless PV has reached mashing temperature.
This feature is useful for the following two situations: A) When a relay is set as
low limit alarm or deviation alarm, and you don’t want the relay to pull in when
you just power up the controller as the start-up temperature will be in the alarm
zone. B) When Relay 2 is set to Timer Mode and it is supposed to trigger a
buzzer when the timer is up. Without Alarm Suppression, the relay would pull in
when controller is just powered up before the timer starts counting.
Note 16: Function Key
There are two function k
eys named “
A
” and “
B
”
which can be used to
reset/cancel the action of the corresponding relays when they are activated. Key
“
A
” on the lower left corner is for Relay 1, Key “
B
” on the lower right corner is for
Relay 2. They only work in Latching Mode or Non-Latching Mode (
LAt
=
Y
or
N
),
and they have no effect in Pulsing Mode (
LAt
=
PuL
). By default, Function Keys
are disabled. To enable these two keys, set the parameter “
Key
”, which is the
last parameter listed in the menu of system configuration, to “on” (
Key
=
on
).
For a relay whose logic mode is set to Logic Close (
Lgc
=
RL-C
), press the
function key when the relay is activated (close) will cancel the relay action, i.e.,
the relay will drop out (open). For a relay whose logic mode is set to Logic Open
(
Lgc
=
RL-O
), press the function key when the relay is activated (open) will
cancel the relay action, i.e., the relay will pull in (close).
7.3 Parameters in Alarm Settings
In the menu of alarm settings, there are four sets of parameters for each relay:
AH
,
AL
,
HY
and
AP
.
Table 7. Alarm Parameters Listed in Alarm Setting Menu.
Alarm Configuration (Alarm parameters part 2)
Display
Code
Description
Setting Range
Initial
Setting
Remark
AH1
AH1
Alarm 1 high limit
OFF, 1 ~ 9999
OFF
Note 17
AL1
AL1
Alarm 1 low limit
OFF, 1 ~ 9999
OFF
Note 18
HY1
HY1
Alarm 1 hysteresis
band
0.1-100.0
0.3
Note 19
AP1
AP1
Alarm 1 pulse length
1-100
5
Note 20
AH2
AH2
Alarm 2 high limit
OFF, 1 ~ 9999
OFF
Note 17
AL2
AL2
Alarm 2 low limit
OFF, 1 ~ 9999
OFF
Note 18
HY2
HY2
Alarm 2 hysteresis
band
0.1-100.0
0.3
Note 19
AP2
AP2
Alarm 2 pulse length
1-100
5
Note 20
