Newtons4th LEM-6 Power Analyzers User Guide
- October 31, 2023
- Newtons4th
Table of Contents
Newtons4th LEM-6 Power Analyzers User Guide
LEM current transducers are recognized as leaders in the field of high current AC+DC sensors and used in conjunction with PPA series power analyzers, they allow N4L to provide world leading high power measurement systems.
The performance of any system involving external current sensors is largely dependent on the interfacing and connection technique. This is more complex than commonly imagined and often represents the difference between a good and bad system.
Power supply stability, constant and peak current rating, burden resistor selection, connection cable volt drop, noise rejection and total burden limits for a CT are some of the issues easily overlooked despite being critical to achieving an effective solution.
N4L current transducer interface accessories provide a solution to almost any high current power measurement environment with hardware specifically designed for ease of use, reliability, and optimum performance.
Module
LEM-6 Interface
LEM-1 Interface
LEM-1 50W Power Module
LEM-1 120W Power Module
The ideal solution will depend upon the number of phases, the LEM CT’s being used for each phase plus the distance between the power analyzer and the current sensor(s).
Interconnecting cables used in each system follow the key below:
Connection cable key
D type – Multi core cable – 2m standard – up to 6m optional
Safety BNC to BNC Std 1m
± 15V DC Power
Touchproof 4mm – Coax – Safety BNC – up to 18m
Option 1:
LEM-6 Interface Unit
The LEM-6 interface together with connection cables supplied as standard provides the most convenient and flexible solution for systems with up to 707 Arms on 3 to 6 phases.
Each phase has an individual DC-DC converter to optimise stability and 4 selectable burden resistor values. The 1 Ohm burden is used for full CT range measurements while the higher burden values provide additional measurement sensitivity in applications where a CT will continuously work in a low current region of its specified range.
Number of phases on one interface – 3 to 6
Calibrated Burden resistor values – 4 per phase (1, 2.5, 5 and 10 Ohm)
Max CT secondary current – 1A dc or ac peak per phase
Distance from Interface to CT(s) – Up to 6m
Where multiple burden resistors are not required, the CT current is above 707 Arms or the distance between the power analyzers and CT’s is above 6m, the LEM-1 Interface powered by one of our LEM-1 Power Modules provides the solution.
Option 2:
LEM-1 Interface + LEM-1 Power Module
Number of phases on one interface – 1
Calibrated Burden resistor value – 1 (1 Ohm)
Max CT secondary current – 1.6Arms per phase
Distance from Interface to CT – Up to 6m
Option 3:
LEM-1 Interface + LEM-1 Power Module + BDR01
Number of phases on one interface – 1
Calibrated Burden resistor value – 1 (1 Ohm)
Max CT secondary current – 1.6Arms per phase
Distance from Analyzer to Interface – Up to 18m
APP GUIDE – Current transducer cabling principles.pdf
Multi-phase LEM-1 systems
Featuring a universal AC power input and touchproof 4mm safety outputs for
convenient connection to multiple LEM-1 interfaces, the LEM-1 Power Modules
maintain a stable ±15V DC supply over their complete power range plus a x2
full power capacity for 100ms to support overload capability available on most
LEM CT’s.
CT Model| Max AC Amps RMS| LEM-6Interface| LEM-1Interface| LEM-1 50WMax LEM-1
/ CT’s| LEM-1 120WMax LEM-1 / CT’s
---|---|---|---|---|---
IT 60-S| 42| Yes| Yes| 6| 6
IT 65-S | 60| Yes| Yes| 6| 6
IN 100-S| 100| Yes| Yes| 5| 6
IT 200-S| 141| Yes| Yes| 6| 6
IN 200-S| 200| Yes| Yes| 5| 6
IT 205-S | 200| Yes| Yes| 6| 6
IT 400-S| 282| Yes| Yes| 6| 6
IN 400-S| 400| Yes| Yes| 4| 6
IT 405-S | 400| Yes| Yes| 4| 6
IN 500-S| 500| | Yes| 1| 3
IT 600-S| 425| Yes| Yes| 3| 6
ITN600-S| 424| Yes| Yes| 3| 6
IT 605-S | 600| Yes| Yes| 3| 6
IT 700-S| 495| Yes| Yes| 3| 6
ITN 900-S| 636| Yes| Yes| 2| 5
ITN 1000-S| 707| Yes| Yes| 2| 4
IT 1000-S| 707| | Yes| 1| 3
IN 1000-S| 1000| | Yes| 1| 3
IN 1200-S| 1200| | Yes| 1| 3
IN 2000-S| 2000| | Yes| 1| 3
LEM-1 Power Module selection chart
LEM-1 Power Module electrical specification
| Parameter | LEM-1 50W | LEM-1 120W |
|---|---|---|
| Input Voltage | 90-264 Vrms | |
| Input Frequency | 47-63Hz | |
| Output Voltage | DC ± 15V | |
| Output Current | 1.67A Continuous | 4A Continuous |
| Load Regulation | ±1% @ 10-100% full load | |
| Overload capability | Continuous rating x2 for 100ms – 10% duty cycle | |
| Output protection | Short circuit protection with foldback – Auto recovery | |
| Operating Temp | -30ºC to 70ºC | |
| Typical Efficiency | > 85 % @ full load |
LEM-1 Interface and Power Module dimensions
Product names and Options
OPTION 1
N4L-LEM6-3 Three Channel Interface| LEM6-3 – 19″ rack mountable Three Channel
System Interface Unit + 0.5m Safety BNC-BNC Leads + 4mm shorting connectors
N4L-LEM6-4 Four Channel Interface| LEM6-4 – 19″ rack mountable Four Channel
System Interface Unit + 0.5m Safety BNC-BNC Leads + 4mm shorting connectors
N4L-LEM6-5 Five Channel Interface| LEM6-5 – 19″ rack mountable Five Channel
System Interface Unit + 0.5m Safety BNC-BNC Leads + 4mm shorting connectors
N4L-LEM6-6 Six Channel Interface| LEM6-6 – 19″ rack mountable Six Channel
System Interface Unit + 0.5m Safety BNC-BNC Leads + 4mm shorting connectors
LEM Interface Cable Assembly-2m| LEM-1 & LEM6 CT to interface cable 2m length
– Supplied standard
LEM Interface Cable Assembly-3m| LEM-1 & LEM6 CT to interface cable 3m length
– Optional
LEM Interface Cable Assembly-4m| LEM-1 & LEM6 CT to interface cable 4m length
– Optional
LEM Interface Cable Assembly-5m| LEM-1 & LEM6 CT to interface cable 5m length
– Optional
LEM Interface Cable Assembly-6m| LEM-1 & LEM6 CT to interface cable 6m length
– Optional
OPTION 2
LEM-1 Interface| LEM-1 Interface + 4mm & BNC shorting connectors + colour
coded power leads + 0.5m Safety BNC-BNC Lead Unit Only – NO PSU
LEM-1 50W Power Module| Universal Input to ±15V @ 1.67A Output Power
module + IEC input lead
LEM-1 120W Power Module| Universal Input to ±15V @ 4A Output Power
module + IEC input lead
LEM Interface Cable Assembly| As in Option 1 shown above
OPTION 3
LEM-1 Interface| As in Option 2 shown above
LEM-1 50W Power Module| As in Option 2 shown above
LEM-1 120W Power Module| As in Option 2 shown above
LEM Interface Cable Assembly| As in Option 1 shown above
LEM-1 Current Breakout Cable| 4mm – Coax – Safety BNC – Connection cable – 4m
Current Breakout Cable Extension| Breakout cable extension – charged per meter
up to 14m (18m total)
BDR01 – 1 Ohm Burden Resistor| 1 Ohm Burden Resistor – 0.1% – BNC touchproof
connectors
Newtons4th Ltd
office@newtons4th.com
www.newtons4th.com
Newtons4th Ltd 1 Bede Island Road Leicester LE2 7EA UK Tel +44 (0)116 2301066
Documents / Resources
|
Newtons4th LEM-6 Power
Analyzers
[pdf] User Guide
LEM-6 Interface, LEM-1 Interface, LEM-1 50W Power Module, LEM-1 120W Power
Module, LEM-6, LEM-6 Power Analyzers, Power Analyzers, Analyzers
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