Helios Large Display Pulse Input Batch Controller Instruction Manual
PD2-6310
43
Relays Initialization
Batch control (total) relays will activate when the start function is enabled, such as when the START
button is pressed. Rate alarm relays will enable and initialize to their programmed states when the batch
process is started. Grand total alarm relays will initialize to their programmed state at controller power-up.
Fail-Safe Operation
The following table indicates how
the relays behave based on the fail-
safe selection for each relay:
Note: NO = Normally Open,
NC = Normally Closed.
This refers to the condition of
the relay contacts when the
power to the meter is off.
Front Panel LEDs
The LEDs on the front panel provide status indication for the following:
The controller is supplied with four alarm points that include front panel
LEDs to indicate alarm conditions. This standard feature is particularly
useful for alarm applications that require visual-only indication. The LEDs
are controlled by the set and reset points programmed by the user. When the display reaches a set point
for a high or low alarm, the corresponding alarm LED will turn on. When the display returns to the reset
point the LED will go off. Note that rate alarms are only enabled during a batching process, and
deactivate when the processes is stopped.
Latching relays, or relays with manual reset, are not recommended when using this controller for batch
control, as the manual reset will not be acknowledged during a batch process, when the rate alarms are
active. For information on latching and manual reset alarms, see the PD2-6200 instruction manuals
available.
Automatic Reset (
Auto
)
In this application, the controller is set up for automatic
reset (non-latching relay). Acknowledging the alarm while it
is still present has no effect on either the LED or the relay.
When the alarm finally goes away, the relay automatically
resets and the LED also goes off.
Pump Alternation Control Applications (
Altern
)
Pump alternation control is not recommended when using this controller for batch control, as it is used
only in level applications, and not with rate, total, or batching applications. For information on using pump
alternation control for level, see the PD2-6000 instruction manuals available.
Fail-Safe
Selection
Non-Alarm State Alarm State
Power Failure
NO
NC
NO
NC
Off
Open
Closed Closed Open
Relays go to
non-alarm state
On
Closed
Open
Open
Closed Relays go to
alarm state
LED
Status
1
Alarm 1
2
Alarm 2
3
Alarm 3
4
Alarm 4
Automatic reset only
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack (No effect)
On
On
Normal
Off
Off
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