Helios PD2-6400 High Voltage & High Current Meter
Instruction Manual
35
Acknowledging Relays
There are three ways to acknowledge relays
programmed for manual reset:
1. Via the programmable front panel function keys
F1-F3 (Example: F3 assigned to ACK).
2. Remotely via a normally open pushbutton wired
to the F4 terminal.
3. Remotely via a normally open push button wired
to one of the digital inputs and the +5 V terminal
on the digital I/O connections.
When the ACK button or the assigned digital input is
closed, all relays programmed for manual reset are
acknowledged.
Acknowledging Relays with Remote
Control Station
Relays may be remotely acknowledged by connecting
the
to either the F4 terminal or a digital
input as described above.
Pump Alternation Control
Applications (
Altern
)
Pump alternation control is more commonly used on
level applications to alternate pumps so they wear
evenly. This function is not used for monitoring
voltage or current.
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 1 & 2 are configured to energize (their front
panel LEDs are steady on) 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).
Note: If multiple digital inputs are assigned to the
same relay, then the corresponding logic is (AND)
–
i.e. both switches must be closed to trip the relay.
•
If the digital inputs are assigned to the
Interlock
Function
, then they cannot be used to program
the meter remotely.
MENU RIGHT UP ACK
ACK
MENU
RESET
F1
MAX
F2
ENTER
F3
COM
F4
1
2
O1 O2 O3 O4 G
I
1
I
2
I
3
I
4
+5
Ground
5 VDC
ACK
O1 O2 O3 O4 G
I
1
I
2
I
3
I
4
+5
5 VDC
SW1
SW2
