Helios Large Display Pulse Input Batch Controller Instruction Manual
PD2-6310
44
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).
Sample Relay Operation
The sampling function allows the operator to set a set point for a “sampling” relay. This can be done for
the rate, total, or grand total. Each time the relay reaches the set point, it will close that relay’s contacts
for a programmed period of time. A rate sampling relay will activate for the sample time (
sam t
), up to
600.0 seconds, every time the set point rate is reached.
A total sampling relay will activate for the sample time (
sam t
), up to 600.0 seconds every time the
process has batched the amount programmed for the set point, and every time this amount has been
batched afterward. (See the diagram below for more details). The utility of this function can, of course, be
expanded beyond sampling and be used whenever a timed relay output closure is required when the
batch total interval reaches a certain set point.
SW1
SW2
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