PD8-6200 Explosion-Proof Analog Input Flow Rate/Totalizer
Instruction Manual
48
Pump Alternation Visual
Representation
The following graphics provide a visual representation
of a typical pump alternation application with high and
low alarm monitoring:
Relay #4 turns the main pump on at 6000 gallons and
turns it off at 1000 gallons.
With the Pump Alternation feature activated, the next
time the level reaches 6000 gallons, relay #3 transfers
and starts the backup pump.
If the backup pump is not able to keep up, and the
level reaches 7000 gallons, relay #4 transfers and
starts the main pump as well.
Relay #2 trips the High Level Alarm at 7500 gallons
and resets at 6900 gallons.
Relay #1 trips the Low Level Alarm at 495 gallons and
resets at 750 gallons.
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 +5 V
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 activate the relay.
•
If the digital inputs are assigned to the
Interlock
Function
, then they cannot be used to program
the meter remotely.
1
2
3
4
5
6
+5
I1
I2
I3
I4
O1
7
8
O2
O3
9
10
O4
G
DI 1-4
DO 1-4
5 VDC
GND
SW2
SW1
