Precision Digital Corporation Helios PD2-6400 User manual

• Large Display NEMA 4X, IP65 Wall Mounted Meter
• (1) High Voltage and (1) High Current Input
• Multiplication for Apparent Power Calculation
• 0-300 VAC or VDC Voltage Input
• 0-5 AAC or ADC Current Input
• Large Dual-Line 6-Digit Display, 1.8" (46 mm) Digits Readable up to 100 Feet (30 Meters) Away
• Four (4) Relays with Interlocking Capability + Isolated 4-20 mA Output Option
• Free PC-Based MeterView Pro USB Programming Software
• Super Bright Display
• Operating Temperature Range: -40 to 65°C (-40 to 150°F)
• UL & C-UL Listed. E160849; 508 Industrial Control Equipment
• Input Power Options Include 85-265 VAC or 12-24 VDC
• Programmable Display, Function Keys & Digital Inputs
• Onboard RS-485 Serial Communications
• Modbus RTU Communication Protocol Standard
• Split Core AC Current Transformers Up to 1000 A AC Available
• Control Station Accessory Available For Remote Operation of Helios
HIGH VOLTAGE & CURRENT
Actual Size Digit
www.predig.com
PRECISION DIGITAL CORPORATION
PD2-6400
Helios High Voltage & Current Meter

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
2
TABLE OF CONTENTS
OVERVIEW . . . . . . . . . 3
ADVANCED DISPLAY FEATURES . . . 4
QUICK & EASY SCALE &
PROGRAMMING METHODS . . . . 5
4-20 MA OUTPUT & RELAYS. . . . . 8
APPLICATION EXAMPLES . . . . . 11
DIGITAL COMMUNICATIONS. . . . . 13
ON-BOARD DIGITAL INPUTS
AND OUTPUTS . . . . . . . . 13
PHYSICAL FEATURES . . . . . . 14
OPERATIONAL FEATURES . . . . . 16
CONNECTIONS . . . . . . . . 19
DIMENSIONS . . . . . . . . 19
SPECIFICATIONS . . . . . . . 21
ORDERING INFORMATION . . . . . 23

PD2-6400 Helios High Voltage & Current Meter
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The Helios large display high voltage and current meter
boasts specifications, features and functionality that make it
the only large display high voltage and current meter you will
ever need. The big, bright 6-digit dual-line LED display that
can be seen from 100 feet even in bright sunlight is the first
thing you will notice about the Helios. The dual-line display
can be used to display voltage in the range of 0-300 VAC or
VDC on one line and 0-5 AAC or ADC on the other line. In
addition, a math channel P calculates apparent power as the
product of the voltage and current inputs.
The enclosure is rated NEMA 4X which means you can install
the Helios indoors and outdoors, exposed to moisture, dust
and other adverse conditions. Other key features include four
relays and 4-20 mA output option, function keys, and Modbus
RTU serial communications. Finally, all these features and
capabilities can easily be programmed with free MeterView
Pro PC-based software.
Precision Digital also offers several accessories for the Helios
to enhance the user experience:
● AC current transformers that can step down a higher
current to 0-5 AAC that can be read directly by the
PD2-6400
● Control Stations for remote programming and other
functions
The Only Large Display High Voltage & Current Meter You Will Ever Need
OVERVIEW
Front
Connections
+-
21
1
2
3
4
5
6
7
8
RS-485
DIGITAL I/O
M-LINK
USB
MENU RIGHT UP ACK
POWER
PWR TX RX
DI DI DO DO
O1 O2 O3 O4 G
I1I2I3I4+5
__ __
R I-I+ NO
NC
CNO
NC
C NONCC NO NCC
MA OUT
21 34
36521
RELAY4RELAY3
4
36521
RELAY2RELAY1
MENU RESET
F1
MAX
F2
ENTER
F3
SIGNAL
V+ V- F4 COM
21
43
21
I+ I- AC
TYPE
DC
2 5
A
V
Dual-Line
6-Character
Display with
Extra Large
1.8" Digits
User Congurable
Lower Display
(Showing Current)
User Congurable
Upper Display
(Showing Voltage)
Alarm Status
Indicators
Connections and
Function Keys Easily
Accessible Behind
Front Panel Door.
UV Resistant
Sunlight Readable Display
NEMA 4X, IP65
Rated Enclosure

PD2-6400 Helios High Voltage & Current Meter
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4
Dual-Line Makes All the Difference
The upper display can be programmed to indicate PV,
maximum (peak), minimum (valley), alternating maximum/
minimum, one of eight alarm set points, or Modbus input. The
lower display can be configured to display engineering units,
set points, user defined messages, or simply turned off.
The Helios’s dual-line display makes all the difference both
when programming the instrument and when using it in the
field. When programming the instrument, the dual line display
prompts for the needed information and also helps you keep
track of where you are in the setup process. When using the
instrument, the dual line display provides more information
such as displaying the input in two different scales like height
and volume for a level application. We call this the Dual-Scale
feature.
Programming Assistance
The Helios’s dual-line display makes programming the
instrument much easier because the lower line prompts for
the needed information and also helps you keep track of
where you are in the setup process.
The Helios is prompting for the
value for Input 2 and displaying
the default value of 5.00 A. The
“5” in 5.00 is brighter than the rest
of the digits indicating that it is the
number that will be changed by the
Up and Right arrows.
The Helios is now prompting for
what the user wants Display 2 to be;
that is the value that corresponds
to 95.00 A. In this case Display 2 is
currently set to 95.00.
Display Voltage and Current Individually
or at Same Time
The Helios PD2-6400 can accept both a voltage and a current
input. These can be displayed as one or the other as illustrated
in the first set of screen shots below or both at the same time
as illustrated by the second set of screen shots.
ADVANCED DISPLAY FEATURES
MeterView Pro can be used to scale the voltage and the
current inputs on the Helios PD2-6400 meter.
Superluminous Sunlight Readable Display
The Helios's standard SunBright display features
extraordinarily bright LEDs. It is perfect for applications where
the meter is in direct sunlight or in applications where visibility
may be impaired by smoke, fog, dust, or distance.
Rounding Feature for Even Steadier Display
The rounding feature is used to give the user a steadier display
with fluctuating signals. It causes the display to round to the
nearest value according to the rounding value selected (1, 2,
5, 10, 20, 50, or 100). For example, with a rounding value of
10, and an input of 12346, the display would indicate 12350.
Value & AmpsValue & Volts
Alternating Input Value and Units
2 5
A
V
2 5
A
V
2 5
A
V
2 5
A
V
Toggling Between Reading & Units with
Tag and Calculating Apparent Power
The Helios below is programmed so the upper line toggles
between the reading and units, and the lower line displays a tag.
A math channel P calculates apparent power as the product of
the voltage and current inputs shown in the bottom two images.
Upper line toggles between 241.58 and Volts
and the lower line displays Gen 1
Upper line toggles between 1150.6 and Apparent Power
and the lower line displays Gen 1
2 5
A
V
2 5
A
V
2 5
A
V
2 5
A
V

PD2-6400 Helios High Voltage & Current Meter
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5
QUICK & EASY SCALE & PROGRAMMING METHODS
The Helios can be programmed either via the front panel push buttons or free, PC-based MeterView Pro software. MeterView
Pro is resident on the Helios and is accessed by a provided USB cable, so it is by far the easiest way to program the Helios.
The Helios can be calibrated either by applying a known signal or scaled by entering a desired value with the front panel buttons
or MeterView Pro software. Most customers will use the scaling method because it is simpler and does not require a calibrated
signal source. Selecting the input to be current or voltage is done with the front panel buttons or MeterView Pro software. Once
programming is completed it can be locked with a password.
Free PC-Based MeterView Pro USB Programming Software & Cable
The Helios comes preloaded with free MeterView Pro
programming software that connects and installs directly to
your PC with a standard USB cable, also provided free with
each instrument. This eliminates the need to insert CDs, install
drivers, or download software from the internet. When you
connect your Helios to your PC, MeterView Pro is downloaded
to your PC, the software automatically selects the model you
are programming, and you’re ready to start programming
immediately. Further simplifying the programming process, the
Helios can be powered from the USB port, so no need to apply
external power while programming your meter. In addition to
programming, the software will also allow you to monitor, and
datalog a Helios using your PC. You can also generate and
save programming files for later use.
Click here to watch the
Meterview Pro video

PD2-6400 Helios High Voltage & Current Meter
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• Select Voltage or Current Input
• Activate Dual-Scale (Level) Function
• Select Decimal Point
• Set Line 1 Display Parameters
• Set Line 2 Display Parameters
• Set Analog Output Values
• Enable Manual Control
• Test Relays & Digital Outputs
Setup Screen
• Set Scale Values
• Set the Number of Points (up to 32)
• Import from Excel
• Export to Excel
Programming Screen
• Greatly Simplifies Programming a Variety
of Relay Features
• Set Relay Action
• Set Sampling Time
• Set Set & Reset Points
• Set On/Off Time Delays
• Set Fail Safe Operation
• Set Input Break Relay Action
Relays Screen

PD2-6400 Helios High Voltage & Current Meter
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Save/Open Conguration
At the bottom of most MeterView screens are two tabs:
1. Get Meter Data: This reads the programming of the meter that is currently connected to the PC.
2. Send Meter Data: Clicking this button, sends current MeterView programming to the meter.
The configuration file can be sent, or retrieved, from the
directory of your choice. This makes it very easy to program
multiple meters with the same programming. It is also a great
backup utility as well.
Specications
System Requirements:
Microsoft®Windows® XP/Vista/7/8/10
Communications:
Onboard USB (firmware version 4.0 or higher),
RS-232 Adapter or RS-485 Adapter
Meter Address: 1 - 247
Reports:
• Data logging: Save as CSV file format
• Configuration: Save as PDC file format or print
configuration
Baud Rate: 300 - 19,200 bps
Configuration: One meter at a time
Protocol:
Modbus RTU (requires Helios firmware version 4.0 or
higher)
*Note: Windows®32/64-bit operating systems
Password Protection
The Password menu is used for programming three levels of
security to prevent unauthorized changes to the programmed
parameter settings:
Pass 1: Allows use of function keys and digital inputs
Pass 2: Allows use of function keys, digital inputs and editing
set/reset points
Pass 3: Restricts all programming, function keys, and digital
inputs
Click here to watch the
Meterview Pro video

PD2-6400 Helios High Voltage & Current Meter
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8
4-20 mA Analog Output
The isolated analog output can be configured to represent
the process variable (PV), maximum (peak) value, minimum
(valley) value, the value for any of the eight relay set
points, or Modbus input. While the output is nominally
4-20 mA, the signal will accurately accommodate under- and
over-ranges from 1 to 23 mA.
The 4-20 mA output can be reversed scaled such that 4 mA
represents the high value and 20 mA represents the low value.
For instance, a 4-20 mA output signal could be generated as
the meter went from 100.0 to 0.0.
For applications where the input was linearized by the Helios,
the 4-20 mA output will represent that linearized value.
Connections
The Helios can provide 40 mA at 24 VDC to power the
4-20 mA output signal or an external power supply can be
used:
The internal 24 VDC power supply powering the analog output
may be used to power other devices, if the analog output is
not used. The I+ terminal is the +24 V and the R terminal is
the return.
4-20 mA Output Powered by PD2-6400
4-20 mA Output Powered by External Power Supply
4-20 mA OUTPUT & RELAYS The 4-20 mA output can either be programmed using the front
panel push buttons or free MeterView Pro software.
The meter can be set up for reverse scaling as shown below:
the output will be 4.00 mA when the display reads 150.0 and
the output will be 20.00 mA when the display reads 0.
Front Panel Push Button Programming
The 4-20 mA analog output can be scaled to provide a 4-20
mA signal for any display range selected. No equipment is
needed to scale the analog output; simply program the display
values to the corresponding mA output signal. The Analog
Output menu is used to program the 4-20 mA output based
on display values.
Aout
setup
dis 1
Aout
00000.0
d i s 1
dis 2
Aout
150.0
d i s 2
Out 1
Aout
04.000
O u t 1
Out 2
Aout
20.000
O u t 2
00
MeterView Pro Software Programming
When a meter is programmed as shown below, the output will
be 4.00 mA when the display reads 0 and the output will be
20.00 mA when the display reads 150.0.
Source: Source for generating the
4-20 mA output (e.g. Amps)
Overrange: Analog output value
with display in overrange condition
Underrange: Analog output
value with display in underrange
condition
Break: Analog output value when
current input break is detected
Max: Maximum analog output
value allowed regardless of input
Min: Minimum analog output value
allowed regardless of input
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
RI-I+
1 32
RELAY1
321
24 V
-
4-20 mA Input
Remote Display,
Chart Recorder, Etc.
-
+
RI-I+
MA OUT
1 32
RELAY1
321
24 V
MA OUT
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
RI-I+
1 32
RELAY1
321
24 V
-
4-20 mA Input
Remote Display,
Chart Recorder, Etc.
-
+
RI-I+
MA OUT
1 32
RELAY1
321
24 V
MA OUT

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
9
Relays for Alarm & Control Applications
Adding relays to the Helios meter turns it into a sophisticated alarm device as well as a powerful, yet simple, alternative to a
more complicated PLC system for control applications. The Helios can be equipped with four 3 A Form C (SPDT) internal relays.
Relays are highly user-configurable as the following screen shot from MeterView Pro indicates:
Setting Set and Reset Points (HI / LO Alarms)
All relays are independent of each other and may be
programmed as high or low alarms with user desired set and
reset points. Setting a set point above a reset point results in
a high alarm and setting a set point below a reset point results
in a low alarm. Alarms have 0 – 100% deadband and set and
reset points may be set anywhere in the range of the meter.
Resetting the Relays (Action in MV Pro)
All relays are independent of each other and may be
programmed to reset (Action in MV Pro) in the following ways:
• Automatic: Alarm will reset automatically once the alarm
condition has cleared.
• Automatic/Manual: Alarm will reset automatically once the
alarm condition has cleared but can also be reset at any
time with a switch wired across terminals F4 and Common*.
• Latching: Alarm must be reset manually and can be done
so at any time with a switch wired across terminals F4 and
Common*.
• Latching with Reset after Cleared: Alarm must be
reset manually and can only be done so after the alarm
condition has cleared with a switch wired across terminals
F4 and Common*.
* Or via one of the four digital inputs
*Values are intended to show programming choices. They are not intended to represent an actual application.
Time Delay (On and Off)
In many applications it is desirable to wait before turning off
or on a relay – such as waiting for a process to settle before
taking action. Each relay on the Helios can be programmed
with independent on and off time delays of 0 to 999.9 seconds
to achieve this.
Relays Auto Initialization
When power is applied to the meter, the front panel LEDs and
alarm relays will reflect the state of the input to the meter.
Signal Loss or Current Input Break Relay Operation
When the meter detects a break in the current input, the relay
will go to one of the following selected actions:
1. Turn On (Go to alarm condition)
2. Turn Off (Go to non-alarm condition)
3. Ignore (Processed as a low signal condition)
User Selectable Fail-Safe Operation
All relays are independent of each other and may be
programmed for user selectable fail-safe operation. With the
fail-safe feature activated, the relays will transfer to the alarm
state on power loss to the meter.

PD2-6400 Helios High Voltage & Current Meter
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10
Front Panel LEDs
The meter is supplied with four alarm points that include
front panel LEDs to indicate alarm conditions. This standard
feature is particularly useful for alarm applications that require
visual-only indication.
Manual Output Control
Take control of any output with
this feature. All relays can be
forced ON or OFF, and the
4-20 mA output signal can
be set to any value within its
range. When the relays and
4-20 mA output are controlled
manually, an LED labeled “M”
is turned on and the associated
Alarm LEDs (1-8) flash every
10 seconds indicating that
the meter is in manual control
mode.
Sampling Function (PV Triggered Timed Relay)
The sampling function allows the operator to set a relay as a
“sampling” relay. When the PV reaches that set point, it will
close that relay’s contacts for a preset period of time (0.1 to
5999.9 seconds).
Switching Inductive Loads
The use of suppressors (snubbers) is strongly recommended
when switching inductive loads to prevent disrupting the
microprocessor’s operation. The suppressors also prolong the
life of the relay contacts. Precision Digital offers the PDX6901
Snubber with 0.01μF/470Ω flexible leads.
Interlock Relay(s)
This function allows a process to use one or more very low
voltage input signals or simple switch contacts to control the
state of one or more internal “interlock” relays. A violation
(i.e. loss of input, open switch, or open circuit) forces one or
more N/O interlock relay contacts to open. One input can be
used in series with a number of interlock switches, or up to
four inputs can be required to force-on one (or more) internal
interlock relays. Please see Safety Interlock on the ProVu
Series whitepaper on our website for more information.
1M
1M

PD2-6400 Helios High Voltage & Current Meter
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11
0-5 AAC
Transformer
Lighting System
0-5 AAC
A
Generator (120 VAC)
Load
+
≈120 VAC
–
2 5
V
Voltage/Current Input Application Example
Voltage/Current Input Wiring Example
with AC Switch Selected
Model PD6400 High Voltage & Current Meter Instruction Manual
20
Figure 9. DC Voltage Input Connections
Current Input
The following figures show examples of connecting the meter for a current
input. Note that in addition to the connections, the AC/DC type switch
much also be set.
Figure 10. AC Current Connections
Figure 11. AC Current Transformer Connections
Model PD6400 High Voltage & Current Meter Instruction Manual
22
Figure 14. AC Current Transformer and Voltage Connections
Figure 15. DC Current and Voltage Connections
Apparent Power Measurement Using a Current Transformer
Current Measurement for a Lighting System
APPLICATION EXAMPLES
The PD2-6400 Helios can be used to display application data for voltage, current, or both. Each Channel, Voltage or Current, can
be scaled independently. The following examples show just a few of the PD2-6400’s application capabilities using generators
and transformers. Each example is followed by a wiring diagram that shows proper switch position for the meter.
Voltage Input Application Example
Voltage Input Wiring Example
with AC Switch Selected
Model PD6400 High Voltage & Current Meter Instruction Manual
19
Power Connections
Power connections are made to a two-terminal connector labeled
POWER on Figure 6. The meter will operate regardless of DC polarity
connection. The + and -symbols are only a suggested wiring convention.
Figure 7. Power Connections
Signal Connections
Signal connections are made to a four-terminal connector labeled
SIGNAL on Figure 6. The I+ and I-terminals are used for Channel A
(CH-A) as the current input terminals. The V+ and V-terminals are used
for Channel V (CH-V) as the voltage input terminals.
In addition to the signal connections, the switch labeled TYPE on Figure
6must be set to AC (alternating current) or DC (direct current) to accept
the corresponding type of voltage and current signals.
Voltage Input
The following figures show examples of connecting the meter for a
voltage input. Note that in addition to the connections, the AC/DC type
switch much also be set.
Figure 8. AC Voltage Input Connection
AC or DC
POWER
Required External Fuse:
5 A max, 250 V Slow Blow
POWER
+-
Voltage Measurement for a Generator Driving a Load
Current Input Wiring Example
with AC Switch Selected
Current Input Application Example
Load
120 VAC @
700 AAC
0-5 AAC
Current
Transformer
2 5
A
V

PD2-6400 Helios High Voltage & Current Meter
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PDA6405-100
Current Transformer
75 AAC Motor
PD2-6400 High Voltage & Current Meter
AC
Power
0-5 AAC
A
Measuring Current with PDA6405-100 Current Transformer
and PD2-6400 large display high voltage & current meter.
TO CURRENT
TRANSFORMER
PD2-6400 Connections from PDA6405 Current Transformer
with AC Switch Selected.
Converting High AC Current with the PDA6405 Split Core AC Current Transformer
Precision Digital offers a line of split core AC current
transformers that convert the high AC current flowing through
a cable or wire to a 0-5 AAC output that can be displayed
on a PD6400. The PDA6420 works with a PD6400 because
it puts out a 4-20 mA signal. They are available in ranges
of 100, 200, 400, 600, and 1000 AAC. These nonintrusive
devices feature split core convenience for easy installation
and are a cost effective solution for monitoring load or proof
of operation. The PDA6420 current transformers are ideal for
monitoring current loads on pumps, driving fans and blowers,
and sensing the status of heating coils and lighting.
Specications:
Current Range: 100A, 200A, 400A, 600A, and 1000A (based on model)
Output: 0-5 A
Accuracy: +/- 1%
Burden: 2VA
Insulation Voltage: CAT IV 250 or CAT III 600VAC
Maximum Primary Voltage: 5000 VAC (Insulated Conductor)
Phase Angle: Less than 2 degrees at 50% of rated current
Frequency Range: 50/60 Hz
Operating Temperature: -40 to 55°C
Humidity: 0-95% RH non-condensing, Indoor use only
Pollution Degree: 2
Leads: 18AWG 1.0 m cable
UL File Number: UL recognized for US and Canada (E341727)
100 ACC
400 ACC
1000 ACC
600 ACC
200 ACC
PDA6405 Split Core AC Current Transducer

PD2-6400 Helios High Voltage & Current Meter
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13
DIGITAL COMMUNICATIONS
Modbus®RTU Serial Communications
With onboard RS-485 serial communication, the PD2-6400
can communicate with any Modbus master device using the
popular Modbus communications protocol that is included in
every Helios. In addition to the typical Modbus capabilities of
reading PVs and writing set points, below are some examples
of other things that can be done with the meter’s Modbus
communications:
• Send a 6-character message to the lower display upon an
event
• Convert a digital value to a 4-20 mA signal
• Remote user control (i.e. change set points, acknowledge
alarms)
• Input a Modbus digital PV (in place of analog input)
• Remote override of any, or all, relays and analog outputs
Additional Communication Modules
In addition to RS-485 communications which is a standard
feature, the Helios is available with serial communications
modules for RS-232 and USB.
For more
info on serial
converters
click here.
PDA7485-I
RS-232 to
RS-422/485
Isolated Converter
PDA8485-I
USB to
RS-422/485
Isolated Converter
*All adapters and connectors supplied with appropriate cables.
Modbus PV Input Remote Message
ON-BOARD DIGITAL INPUTS AND
OUTPUTS
The PD2-6400 includes five (5) digital inputs and four (4) digital
outputs standard. Since the Helios is a large display meter it is
often mounted in areas where it is not convenient to access the
programming buttons. The digital inputs can be set up to mimic
the four programming buttons on the Helios meter, thus making
it possible to mount remote buttons for programming in a more
convenient location. In addition, the digital inputs can also be
used to reset the total, operate the tare feature, reset the tare,
and more. The digital outputs can be used to drive alarming
devices or as a means to communicate alarm conditions with
a PLC.
V+ V-
F4
COM
21
43
21
I+ I-
O1 O2 O3 O4 G
I1I2I3I4+5
Ground
5 VDC
4 Digital Inputs
& 4 Digital Outputs
F4 Terminal for
Digital Input
See page 17 for more details on what can be done with the
digital inputs and outputs.
Click here for more information on
the Helios’s Modbus capabilities
2 5
A
V

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14
PHYSICAL FEATURES
Super-Bright 1.8" High LED Display
The Helios features super-bright 1.8" high LEDs; three times the height of standard digital panel meters.
The most striking physical feature of the Helios meter is its dual-line 6-digit display with 1.8" high super-bright LEDs. These
allow the display to be read from up to 100 feet away, even in bright sunlight.
The Helios is designed for ease-of-use in industrial applications where it will be exposed to wet, dusty, hot, cold and other
adverse conditions. The Helios is housed in a rugged NEMA 4X enclosure, can operate over a wide temperature range,
includes removable screw terminal connectors, and is UL Listed for electrical safety. All of these features are backed by a
3-year warranty.
0.6"
15 mm
Standard
Panel Meter
1.8"
46 mm
Helios
Large Display
Type 4X / NEMA 4X Front Panel
Not only does the Helios’s front panel UL Type 4X approval indicate it is waterproof, but it also indicates it is rugged. Part of the
UL Type 4X test is to drop a 2 inch solid stainless steel ball from 8 feet on top of the meter’s cover.

PD2-6400 Helios High Voltage & Current Meter
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15
Integral Holes for Wall Mounting
The Helios’s back panel includes four holes for convenient
wall mounting.
Mounting Plate
Mounting Plate
Pipe
U-Bolt
U-Bolt
Back of Meter
Vertical Pipe Mounting
Horizontal Pipe Mounting
Mounting Hole Mounting Hole
Mounting Hole
Mounting Hole
Mounting Hole
26000
GAL
Integral Holes Locations
Pipe Mounting Kit
The meter can also be mounted to a pipe using the optional
pipe mounting kit (PDA6260). This kit includes two mounting
plates, two U-bolts, and the necessary nuts and bolts.
See PD2-6400 manual for instructions.
Wide Operating Temperature Range
The Helios can operate from -40 to 65°C (-40 to 150°F)
meaning it can be installed in a wide variety of indoor and
outdoor industrial applications. And over this range the Helios
will drift no more than 0.005% of calibrated span/°C max from
0 to 65°C ambient and 0.01% of calibrated span/°C max from
-40 to 0°C ambient.
Removable Screw Terminal Connectors
Industrial applications require screw terminal connections
for easy field wiring and the Helios goes one step further in
convenience by making them removable also.
UL Listing for Electrical Safety
UL & C-UL Listed: USA & Canada
UL 508 Industrial Control Equipment
UL File Number: E160849
Front Panel: UL Type 4X, NEMA 4X, IP65
Low Voltage Directive:
EN 61010-1:2010. Safety requirements for measurement,
control, and laboratory use.
USB Port for Easy Connection to
MeterView Pro Free Software

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
16
OPERATIONAL FEATURES
2. Built-in Digital Inputs/Outputs
The Helios comes with five digital inputs and four digital
outputs. The digital inputs can operate with the interlock relays
feature, force relays on from a signal from a PLC or relay on
other equipment, and much more. The digital inputs can also
be used to mimic the programming buttons, which are located
behind a door and generally not accessible during operation.
The digital outputs can be used to send signals to PLCs and
other devices.
1. Three Buttons Under the Front Cover
The default settings for the function keys are:
F1 F2 F3
Reset Max/Min
Reading
Display Max/Min
Reading
Acknowledge
Relays
Function Keys, F4 Terminal, Digital Inputs
There are two ways the user can interact with the Helios to
perform a variety of useful functions:
V+ V-
F4
COM
21
43
21
I+ I-
O1 O2 O3 O4 G
I1I2I3I4+5
Ground
5 VDC
4 Digital Inputs
& 4 Digital Outputs
F4 Terminal for
Digital Input
Remote Operation of Front Panel Buttons
The Helios’s programming buttons are located behind a door
and generally not accessible during operation. Digital inputs
are provided that can be wired to remote buttons to operate
the programming buttons in a convenient location. MeterView
Pro provides an easy way to do this programming:
Max / Min Display
Max/Min (or Peak/Valley) is standard on the Helios PD2-6400.
Either display can be configured to show either maximum or
minimum excursion since last reset. The displays can also
be configured to toggle between Max and Min values. Both
values can be simply reset from the front panel.
Click here to watch the
Function Keys video
Helios PD2-6400
High Voltage & Current Meter
The Control Station allows for remote control of the PD2-6400’s
four buttons behind the front panel door.
I1I2I3I4+5
Connector blocks located behind front panel door
PDA2364-MRUE
Control Station
Remote Operation Using PDA2364-MRUE Control Station
The PD2-6400's four internal programming and operations buttons can be remotely controlled by using the PDA2364-MRUE
4-button control station accessory as shown in the diagram below.

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
17
MeterView Pro Monitoring & Datalogging
Software
Not only does free MeterView Pro software greatly simplify
setup and programming of the Helios, it can also be used to
monitor and datalog your process.
Datalog Report
Collected data logger information can be sent to a CSV file for
importing into a spreadsheet program. Below is an example of
one such file. Of course, once within the spreadsheet, much
can be done to customize the data.
Relay Control
Relays can be controlled from MeterView Pro for testing
purposes. This is commonly done to determine whether the
relays are functioning properly. In the Setup window, under
Relay and Digital Out Test you have the option of selecting the
relays you want in an ON state or OFF state and also whether
you want to leave the relays in manual control or to return them
to automatic operation.
Click here to watch the
Meterview Pro video
• Custom Tags: i.e. Power
• Custom Units: i.e. Amps, Volts
• Alarm Status Indicators
Plastic Control Stations For The Helios PD6400
PDA2360 Series Control Stations
Model Description
PDA2360-E Emergency Stop Button
PDA2361-A 1 Black Ack Button
PDA2364-MRUE 4 Black Buttons: Menu, Right, Up, Enter
The PDA2360 series of plastic control stations provide a convenient way to remotely control devices such as
Precision Digital’s Helios PD2-6400. The PDA2364-MRUE four-position control station mimics the Helios’s four
buttons behind the front panel door: Menu, Right Arrow, Up Arrow, and Enter. The PDA2360-E is an emergency
stop button and the PDA2361-A is used to acknowledge an alarm.
PDA2360-E
PDA2361-APDA2364-MRUE
• Complete Pre-Assembled Stations
• Normally Open (NO) Spring Return Plastic Bezel
Pushbuttons
• Trigger Action Turn to Release Pushbutton
(PDA2360-E only)
• IP65 / NEMA 4, 4X and 13 Rated
• Four-Position Control Station for Remote Operation
of Helios Buttons
• Wall Mountable

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
18
Function Key, Digital Inputs, & Digital Outputs Descriptions
The following table describes the actions that Helios function keys and digital inputs can be programmed to perform. The table
also describes how the digital outputs can be used to remotely monitor the Helios’s alarm relay states, or the states of a variety of
actions and functions executed by the meter.
Display Description Item
Rst Hi Reset the stored maximum
display value
FK, DI, DO
Rst Lo Reset the stored minimum
display value
FK, DI, DO
Rst HL Reset the stored maximum &
minimum display values
FK, DI, DO
relay Directly access the relay menu FK, DI
Set 1*Directly access the set point
menu for relay 1 (*through 8)
FK, DI
Rly d Disable all relays until a button
assigned to enable relays
(Rly E) is pressed
FK, DI
Rly E Enable all relays to function as
they have been programmed
FK, DI
O Hold Hold current relay states and
analog output as they are until
a button assigned to enable
relays (Rly E) is pressed
FK, DI
d Hold Hold the current display value,
relay states, and analog
output momentarily while the
function key or digital input is
active. The process value will
continue to be calculated in the
background.
FK, DI
Ln1 Hi Display maximum display value
on line 1
FK, DI
Ln1 Lo Display minimum display value
on line 1
FK, DI
Ln1 HL Display maximum & minimum
display values on line 1
FK, DI
Display Description Item
Ln2 Hi Display maximum display value
on line 2
FK, DI
Ln2 Lo Display minimum display value
on line 2
FK, DI
Ln2 HL Display maximum & minimum
display values on line 2
FK, DI
F On 1*Force relay 1 (*through 4) into
the on state. This is used in
conjunction with a digital input
expansion module to achieve
interlock functionality.
FK, DI
Contrl Directly access the control menu FK, DI
disabl Disable the selected function
key or digital I/O
FK, DI
AcH Acknowledge all active relays
that are in a manual operation
mode such as auto-manual or
latching
FK, DI, DO
Reset Directly access the reset menu FK, DI
nmenu Mimic the menu button
functionality (digital inputs only)
DI
rigHt Mimic the right arrow/F1 button
functionality (digital inputs only)
DI
up Mimic the up arrow/F2 button
functionality (digital inputs only)
DI
Enter Mimic the enter/F3 button
functionality (digital inputs only)
DI
Alnm 1*Provide indication when
alarm 1 (*through 8) has been
triggered (digital outputs only)
DO
FK: Function Keys DI: Digital Inputs DO: Digital Outputs
Watch video about the programmable function keys, digital inputs, and all the capabilities these
features offer on the ProVu Series.

PD2-6400 Helios High Voltage & Current Meter
www.predig.com
19
+-
21
1
2
3
4
5
6
7
8
RS-485
DIGITAL I/O
M-LINK
USB
MENU RIGHT UP ACK
POWER
PWR TX RX
DI DI DO DO
O1 O2 O3 O4 G
I1I2I3I4+5
__ __
R I-I+ NO
NC
CNO
NC
C NONCC NO NCC
MA OUT
21 34
36521
RELAY4RELAY3
4
36521
RELAY2RELAY1
MENU RESET
F1
MAX
F2
ENTER
F3
SIGNAL
V+ V- F4 COM
21
43
21
I+ I- AC
TYPE
DC
CONNECTIONS
Connector Labeling for Fully Loaded PD2-6400
DIMENSIONS
Mounting Hole Mounting Hole
Connection
Cover Screw
10.63
(270)
12.59
(319.7)
2.63
(67)
4.77
(121.2)
26000
GAL
Front and Side View
Units: Inches (mm)
Wall Mounting Holes Location Conduit Holes Location
10.43
(265)
9.8
(249)
11.14
(283)
Plugged
Holes
Unplugged
Holes
0.744 (18.9)
Drill or Punch-Out Holes
(4 Places)
Bottom View
Download free 3-D CAD files of these
instruments to simplify your drawings!
predig.com/documentation-cad
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PD2-6400 Helios High Voltage & Current Meter
www.predig.com
20
Go to PREDIG.COM for details on ProVu, ProtEX-MAX and Helios Series Meters
Complete Product Line of Displays and Controllers
IN ALL SHAPES, SIZES & LOCATIONS
PANEL METERS
ProVuSeries
● NEMA 4X, IP65 Rated Front
● Programmable Function Keys
● UL, C-UL, and CE Approvals
● 1/8 DIN Size
● 1.8" Digits Readable From 100 Feet
● NEMA 4X, IP65 Rated Enclosure
● Operating Temperature of -40 to 65°C
● Now UL and C-UL Approved!
LARGE DISPLAYS
Helios Series
IECEx
Big, Bright Displays
For Indoor or Outdoor
in Bright Sunlight
24 VDC
Transmitter
Power Supply
Large Dual-Line
6-Digit Display
MeterView®Pro USB
Programming Software
Up To Four
3 A Form C
Relays (SPDT)
4-20 mA, 0-10 V,
Thermocouple, RTD,
Strain Gauge, High
Voltage, & Modbus Inputs
Universal 85-265
VAC or 12-24 VDC
Input Power
Options
● NEMA 4X, IP68 Rated Enclosure
● SafeTouch®Through-Glass Buttons
● Operating Temperature of -40 to 65°C
● Worldwide Approvals
EXPLOSION-PROOF
ProtEX-MAX Series