Helios Large Display Dual Analog Input Rate/Totalizer Instruction Manual
PD2-6262
8
Relay
Operation
Automatic (non-latching) and/or
manual reset
Latching (requires manual
acknowledge) with/without clear
Pump alternation control (2 to 4
relays)
Sampling (based on time)
Off (disable unused relays and enable
Interlock feature)
Manual on/off control mode
Relay Reset
User selectable via front panel buttons
or digital inputs
1. Automatic reset only (non-
latching), when the input passes
the reset point.
2.
Aut manual reset at any
time (non-latching)
3. Manual reset only, at any time
(latching)
4. Manual reset only after alarm
condition has cleared (latching)
Note: Front panel button or digital
input may be assigned to
acknowledge relays
programmed for manual reset.
Time Delay
0 to 999.9 seconds, on & off relay time
delays
Programmable and independent for
each relay
Fail-Safe
Operation
Programmable and independent for
each relay.
Note: Relay coil is energized in non-
alarm condition. In case of
power failure, relay will go to
alarm state.
Auto
Initialization
When power is applied to the meter,
relays will reflect the state of the input
to the meter.
Isolated 4-20 mA Transmitter Output
Output
Source
Input channels A or B, rate, total, or
grand total; channel C; max or min for
channel A or B; highest or lowest max
or min of A and B; set points 1-8;
Modbus input; or manual control mode
Scaling
Range
1.000 to 23.000 mA for any display
range
Calibration
Factory calibrated: 4.000 to 20.000 =
4-20 mA output
Analog
Output
Programming
23.000 mA maximum for all
parameters:
Overrange, underrange, max, min,
and break
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/
C max from 0 to 65
C
ambient,
0.8 µA/
C max from -40 to 0
C
ambient
Note: Analog output drift is separate
from input drift.
Isolated
Transmitter
Power
Supply
Terminals I+ & R: 24 VDC
10%. May
be used to power the 4-20 mA output
or other devices. Refer to Figure 21
on page 19.
All models rated @ 40 mA max.
External
Loop Power
Supply
35 VDC maximum
Output Loop
Resistance
Power supply Minimu
m
Maximum
24 VDC
10
700
35 VDC
(external)
100
1200
RS485 Serial Communications Terminal
Compatibility
EIA-485
Connectors
Removable screw terminal connector
Max Distance
3,937' (1,200 m) max
Status
Indication
Separate LEDs for Power (P),
Transmit (TX), and Receive (RX)
Modbus
®
RTU Serial Communications
Slave Id
1
– 247 (Meter address)
Baud Rate
300
– 19,200 bps
Transmit
Time Delay
Programmable between 0 and 199 ms
Data
8 bit (1 start bit, 1 or 2 stop bits)
Parity
Even, Odd, or None with 1 or 2 stop
bits
Byte-To-Byte
Timeout
0.01
– 2.54 second
Turn Around
Delay
Less than 2 ms (fixed)
Note: Refer to the Modbus Register Tables located at
www.predig.com for details.
Digital Input & Output Terminal
Channels
4 digital inputs & 4 digital outputs
Digital Input
Logic High
3 to 5 VDC
Digital Input
Logic Low
0 to 1.25 VDC
Digital
Output Logic
High
3.1 to 3.3 VDC
Digital
Output Logic
Low
0 to 0.4 VDC
Source
Current
10 mA maximum output current
Sink Current
1.5 mA minimum input current
+5 V
Terminal
To be used as pull-up for digital inputs
only.
Connect normally open pushbuttons
5 V & DI 1-4.
WARNING!
DO NOT use
+5 V terminal
to power
external
devices.
