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Helios PD2-6100 Strain Gauge, Load Cell, and mV Meter
1.
Relay #4 turns the main pump on at 6000 pounds
and turns it off at 1000 pounds.
2.
With the Pump Alternation feature activated, the
next time the level reaches 6000 pounds, relay
#3 transfers and starts the backup pump.
3.
If the backup pump is not able to keep up, and
the level reaches 7000 pounds, relay #4 transfers
and starts the main pump as well.
4.
Relay #2 trips the High Level Alarm at 7500
pounds and resets at 6900 pounds.
5.
Relay #1 trips the Low Level Alarm at 495
pounds and resets at 750 pounds.
Use the PDA-LH Light / Horn Accessory to
Indicate High and Low Alarm Conditions.
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.
O1 O2 O3 O4 G
5 VDC
+5
SW1
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.
40
Instruction Manual
I1 I2 I3 I4
SW2
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