Sterlco SMC 2-3.5 Portable Chillers - Manual (Page 6)

3200 Series
6 ACS 3216 Operators Manual
3. Panel Layout
3.1 Front Panel Layout
ALM Alarm active (Red)
OP1 lit when output 1 is ON (normally heating)
OP2 lit when output 2 is ON (normally cooling )
OP3 lit when output 3 is ON
OP4 lit when output 4 relay is ON (normally alarm)
SPX Alternative setpoint in use (e.g. setpoint 2)
REM Remote digital setpoint. Also flashes when digital
communications active
RUN Timer/programmer running
RUN (flashing) Timer/programmer in hold
MAN Manual mode selected
Operator Buttons:-
From any display - press to return to the HOME
display
Press to select a new parameter. If held down it will
continuously scroll through parameters.
Press to decrease a value
Press to increase a value
3.1.1 To Set The Target Temperature.
From the HOME display:-
Press to raise the setpoint
Press to lower the setpoint
The new setpoint is entered when the button is released and
is indicated by a brief flash of the display.
3.1.2 Alarms
Up to four process alarms may be configured. Each alarm
can be configured for:-
Full Scale Low The alarm is shown if the process value falls below a
set threshold
Full Scale High The alarm is shown if the process value rises above a
set threshold
Deviation Low The alarm is shown if the process value deviates
below the setpoint by a set threshold
Deviation High The alarm is shown if the process value deviates
above the setpoint by a set threshold
Deviation Band The alarm is shown if the process value deviates
above and below the setpoint by a set threshold
If an alarm is not configured it is not shown in the list of
level 2 parameters, section 5.3
Additional alarm messages may be shown such as
CONTROL LOOP BROKEN. This occurs if the controller
does not detect a change in process value following a
change in output demand after a suitable delay time.
Another alarm message may be INPUT SENSOR BROKEN
(
SBr). This occurs if the sensor becomes open circuit; the
output level will adopt a ‘SAFE’ value which can be set up
in Operator Level 2.
3.1.3 Alarm Indication
If an alarm occurs, the red ALM beacon will flash. A
scrolling text message will describe the source of the alarm.
Any output (usually a relay) attached to the alarm will
operate. An alarm relay can be configured using the Quick
Start Codes to be energised or de-energised in the alarm
condition. It is normal to configure the relay to be de-
energised in alarm so that an alarm is indicated if power to
the controller fails.
Press and τ (ACK) together to acknowledge
If the alarm is still present the ALM beacon will light
continuously otherwise it will go off.
The action which takes place depends on the type of alarm
configured:-
Non
latching A non latching alarm will reset itself when
the alarm condition is removed. By default
alarms are configured as non-latching, de-
energised in alarm.
Auto
Latching An auto latching alarm requires
acknowledgement before it is reset. The
acknowledgement can occur BEFORE the
condition causing the alarm is removed.
Manual
Latching The alarm continues to be active until both
the alarm condition is removed AND the
alarm is acknowledged. The
acknowledgement can only occur AFTER
the condition causing the alarm is removed.
By default alarms are configured as non-latching, de-
energised in alarm.
Measured Temperature
(or Process Value ‘PV’)
Target Temperature
(Setpoint ‘SP’)