PD2-6210
Helios Large Display Analog Input Batch Controller Instruction Manual
45
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.
Setting up the Interlock Relay (Force On) Feature
Relays 1-4 can be set up as interlock relays. To set up the relays for the interlock feature:
1. Access the
Setup
–
Relay
–
Action
menu and set the action to off.
2. In the Advanced features –
User
menu program any of the digital inputs to
Force On
any of the
internal relays (1-4).
3. Connect a switch or dry contact between the +5V terminal and the corresponding digital input (dI-
1 to dI-4) terminal.
Interlock Relay Operation Example
Relays 3 & 4 are configured to energize (their front panel LEDs are off) when SW1 & SW2 switches
(above) are closed. If the contacts to these digital inputs are opened, the corresponding front panel LEDs
flash indicating this condition. The processes being controlled by the interlock relay will stop, and will re-
start only after the interlock relay is re-activated by the digital inputs (switches).
SW1
SW2
Automatic reset only
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack (No effect)
On
On
Normal
Off
Off
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