PLI - Pentair Thermal Controls

Product overview
DigiTrace PLI (Power Line Carrier Interface)
modules provide temperature-monitoring
capability for heat-tracing control and monitoring
systems by communicating the temperature
data to the control system over the
heat-tracing bus wires and the AC power
line, eliminating the need for RTD wiring.
The PLI module receives input from special
transmitters connected to the heat-tracing
cable. The transmitters provide pipe temperatures
from RTDs and continuity confirmation;
they are typically located at the
front and/or end of the heat-tracing circuit.
For further information regarding the special
transmitters, please refer to DigiTrace
SES, SPC and 700-TT-R transmitter
datasheets and installation instructions.
A single twisted-pair RS-485 cable connects
the PLI modules to a DigiTrace NGCcontroller.
DigiTrace PLI Module
H58681 2/11 www.tycothermal.com 1 of 2
PLI
Control and monitoring
DigiTrace PLI modules collect temperature
data for control and monitoring of the heattracing
system by the DigiTrace NGC controller
panel.
For example the DigiTrace NGC-30 can
accept up to 127 temperature inputs from
SES/SPC or 255 temperature inputs
700-TT-R transmitters per PLI module and
up to four PLI modules per NGC-30
controller. PLI modules are placed in the
NGC-30 control panel.
Power-line carrier technology
The DigiTrace PLI system uses frequencyshift
keying to encode digital data on the
power-line network. Digital ones and zeros
are transmitted by coupling high-frequency
signals onto the heat-tracing bus wires and
the AC power line. The digital data are
transmitted in packets that contain errorchecking
fields to validate the correctness
of the data. Since no additional wiring is
General
Area of use Nonhazardous locations
Hazardous indoor locations...in NEMA 7 panels
Hazardous outdoor locations...in NEMA 4,7,9 panels
Approvals
80BJ OPEN ENERGY
MANAGEMENT
SYSTEM ACCESSORY
Heat-tracing power-line carrier interface for the
DigiTrace NGC control system
Supply voltage 100–120 Vac, 208–240 Vac, switch-selectable; 50/60 Hz
Internal power consumption < 5 W
Operating temperature –13°F to 140°F (–25°C to 60°C)
required to bring temperature and continuity
data back to a central location, installation
and maintenance costs are significantly
reduced.
Configurations
The DigiTrace PLI modules are designed to
be local to the distribution transformer that
supplies power to the heat-tracing circuits.
Only one PLI module may be used on the
secondary side of each heat-tracing transformer.
A front-end filter (FEF) is required
on the primary side of each transformer to
provide electrical noise isolation between
the plant environment and the heat-tracing
power-line network environment. This
ensures that transmissions between the PLI
module and the 700-TT-R, SES or SPC
transmitters are reliable and error-free.
The DigiTrace PLI module is an electronic
device mounted in an enclosure that is to
be clipped to a DIN 35-mm rail in a nonhazardous,
indoor location.
1. Self-
Regulating
Cables
2. Power-
Limiting
Cables
3. Mineral
Insulated
Cables
4. Longline
Heating
5. Tubing
Bundles
6. Tank
Heating
7. Snow and
Ice
8. Control and
Monitoring
9. Heat-Trace
Panels
10.Engineered
Products
11.Steam-
Tracing
Systems
12.Technical
Data
Sheets
13.Appendixes 14.Index

PLI
General
Storage temperature –40°F to 167°F (–40°C to 75°C)
Temperature Sensors; Use with DigiTrace 700-TT-R, SES, or SPC Transmitters
Type 100-ohm platinum RTD, three-wire, α =0.00385 ohm/ohm/°C
Can be extended with a three-conductor shielded cable of 20-ohm maximum per conductor.
Quantity per PLI 255 x 700-TT-R; 127 x SES or SPC
Note: The 700-TT-R and SES/SPC transmitters cannot be used on the same PLI module.
Line-Sensing Control and Monitoring
Typical example of individual control with
DigiTrace NGC-30-CRM, PLI, and SES/SPC
modules for ground-fault trip/monitoring and
temperature/heater current monitoring.
Fused
safety
disconnect TB
Front-end filter (FEF)
Isolation
transformer
Communications to DigiTrace NGC Controller
A B C N
DigiTrace NGC-30 panel
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SPC
SES
RS-485 bus
PLI mounted in NGC-30 panel
NGC-30-CRM mounted in NGC-30 panel
12
MSB LSB
1 2 3
TB 19
TB 1 TB 2 TB 3 TB 4 TB 5
TB 7 TB 6
TB 13 TB 14 TB 15 TB 16 TB 17
Type RS-485
Connection terminals 28–12 AWG (0.08–2.5 mm2 )
Cable One shielded twisted pair
Length 4000 ft (1200 m) maximum total
Address
Connection Terminals
Switch-selectable,1–99
Control power Two terminals, 24–12 AWG (0.2–3.3 mm2 )
Power-line interface (PLI) Four terminals, 24–12 AWG (0.2–3.3 mm2 Dimensions
)
Length x width x height
Mounting
6 in (152 mm) x 2-7/8 in (73 mm) x 2-1/2 in (64 mm)
Method Mounts on a DIN 35-mm rail
Ordering Details
DigiTrace PLI modules
Catalog number Part number Weight
Interface unit
Accessories
PLI 488323 1.0 lb (0.4 kg)
Front-end filter FEF-480V 922847 15 lb (6.8 kg)
FEF-600V P000000312 15 lb (6.8 kg)
RS-485 bus 1000-ft reel MONI-RS485-WIRE 549097 17 lb (7.5 kg)

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info@tycothermal.com
www.tycothermal.com
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