LEM IST ULTRASTAB User manual

N° 99.92.98.000.0
5October2021/Version 8 Page 1 /14
IST ULTRASTAB
USER GUIDE

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TABLE OF CONTENTS
1INTRODUCTION ................................................................................................................................... 3
2RECEIVING AND UNPACKING............................................................................................................ 3
3WARRANTY STATEMENT ................................................................................................................... 4
4TECHNICAL SPECIFICATIONS ........................................................................................................... 5
5SYSTEM DESCRIPTION ...................................................................................................................... 6
5.1 FRONT PANEL.............................................................................................................................. 7
5.2 INDICATOR PANEL ...................................................................................................................... 7
5.3 BACK PANEL ................................................................................................................................ 8
5.4 TRANSDUCER PORT................................................................................................................... 8
5.5 CONNECTING THE TRANSDUCERS.......................................................................................... 9
5.6 OUTPUT PORT ........................................................................................................................... 10
5.7 VOLTAGE OUTPUT VERSIONS ................................................................................................ 10
5.8 STATUS / INTERLOCK............................................................................................................... 11
6INSTALLATION ................................................................................................................................... 13
7OPERATING INSTRUCTIONS ........................................................................................................... 14
8MAINTENANCE .................................................................................................................................. 14
LIST OF FIGURES
FIGURE 1: An overview of the front panel, with a close-up of the indicator panel ....................................... 7
FIGURE 2: Overview of the IST ULTRASTAB back panel ........................................................................... 8
FIGURE 3: Pinout for 9-pin transducer connector ........................................................................................ 8
FIGURE 4: Connecting a transducer to IST ULTRASTAB............................................................................ 9
FIGURE 5: Transducer to IST ULTRASTAB connection cable wiring .......................................................... 9
FIGURE 6: Output terminals........................................................................................................................ 10
FIGURE 7: Status/Interlock port wiring ....................................................................................................... 11
FIGURE 8: Pinout for 15-pin status connector ............................................................................................ 12
FIGURE 9: IST ULTRASTAB in a typical 3-channel current output application ......................................... 13
LIST OF TABLES
TABLE 1: IT/ITN/IN ULTRASTAB compatibility chart. .................................................................................. 6
TABLE 2: Shielded connection cables ......................................................................................................... 9
TABLE 3: Voltage output versions .............................................................................................................. 10
TABLE 4: Recommended standard values of R......................................................................................... 12

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1 INTRODUCTION
Congratulations with your purchase of LEM IST ULTRASTAB.
The IST ULTRASTAB unit serves as power supply and signal processing unit for up to 6
individual LEM high precision current transducers. It ensures that the extremely high precision
and low noise offered by the transducers is preserved and made available in a convenient and
user-friendly unit.
Please read this manual carefully before use. It contains information on how to set up and use
the IST ULTRASTAB and how to build a system utilizing the multichannel capabilities of the unit.
In case of unanswered questions do not hesitate to contact your LEM representative.
IMPORTANT:LEM will not be held responsible for use of the IST ULTRASTAB unit under conditions
and/or in application setups not supported by the information in this user guide.
2 RECEIVING AND UNPACKING
The shipping material and the IST ULTRASTAB should be thoroughly inspected for signs of
obvious physical damage immediately upon receipt.
All materials in the package should be checked against the enclosed packing list and the list of
standard delivery below. LEM will not be responsible for any shortages unless notified
immediately.
The IST ULTRASTAB package should contain:
•Electronics 19 inch crate model IST ULTRASTAB
•European (Schuko) and USA mains cable with three-pole IEC female connector.
IN CASE OF DAMAGE
If the equipment is damaged in any way, a claim should be filed with the shipping agent, and a
full report of the damage should be forwarded to LEM immediately upon arrival. Please see more
on http://www.lem.com , After Sales customer service – Return Merchandise Authorization RMA
procedure.
Upon receipt of the report, LEM will forward instructions concerning the repair, replacement or
return shipment.
Please include the Product description, Serial number and Order reference on any communication
with LEM.

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3 WARRANTY STATEMENT

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4 TECHNICAL SPECIFICATIONS
Electrical Data – MAINS INPUT
Mains Input
100 ... 240 V RMS, 50/60 Hz
IEC-type dual-fused inlet socket
Fuses
2.5 At / 240 V RMS
Power consumption
< 150 W
All channels driven at max. 1 A RMS
secondary output current
Electrical data – TRANSDUCER PORT
Supply output
±15 V DC
6 channels
Ripple
< 15 mV RMS
50/60Hz
Noise
< 15 mV RMS
DC to 10kHz
Load regulation
< 5 %
Power budget
125 W max
20.8 W max
Total: for all 6 channels connected
Per channel
Note:1) In case of high overloads (> 15 kA), internal power supply can raise up to -19 V in case
of overloads > +15 kA and +19 V in case of overloads > -15 kA.
So, a certain caution should be taken vs the associated sensors to protect them against these
overloads conditions.
In these special overloads conditions of use, the main supply enters in protection mode and falls
down to 0 V. Then this requires to switch off the main AC supply during 1 minute so that the IST
to operate in normal mode again.
Electrical data – STATUS PORT
Max Collector-Emitter
voltage, off-state
45 V
Max Collector-Emitter
current, on-state
30 mA
Max reverse Collector-
Emitter voltage, off-state
5 V
Collector-Emitter voltage,
on-state
≤1 V
Insulation voltage
3 kV RMS
between rack electronics and status
port connections
Physical data
Dimensions
483 x 88 x 290 mm
W x H x D, incl.
handles/connectors
Weight
4.2 kg
Operating conditions
Temperature
10 … 40 °C
Humidity
20 … 80 % RH
Cooling
Passive
Storage conditions
Temperature
-20 … 85 °C
Humidity
20 … 80 % RH

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Regulatory conformance
Safety
IEC 61010-1: 2010
EMC
IEC 61000-6-2: 2016
IEC 61000-6-4: 2011
EN 61326-1: 2013
The IST has been tested for
Industrial environment level,
and is a Class B equipment
(RF emission)
5 SYSTEM DESCRIPTION
The system cabinet is compatible with standard 19 inch rack mount systems, but can also be used
in a table-top setup.
LEM IST ULTRASTAB is available in two versions:
-Current output
-±10 V Voltage output.
The IST Voltage output version differs from the current output one only in having up to six
current-to-voltage conversion modules (VOM), which are mounted in the chassis.
Typical applications include multichannel AC and DC measurements on three-phase systems like
motors and motor drivers, power converters and similar types of equipment often in combination
with a precision power analyser.
Depending on the transducer’s type and applied primary current (DC or AC), the IST ULTRASTAB
can drive up to 6 channels at a total consumption of maximum 125 W.
Current range Products
60 A
IT 60-S, IT 65-S
200 A
IT 200-S, IT 205-S
400 A
IT 400-S, IT 405-S
500 A
IN 500-S
600 A
IT 605-S, ITN 600-S
700 A
IT 700-S
900 A
ITN 900-S
1000 A
IT 1000-S/SP1, ITN 1000-S, IN 1000-S
1200 A
IN 1200-S
2000 A
IN 2000-S (1)
TABLE 1: IT/ITN/IN ULTRASTAB compatibility chart.
Note 1) For IN 2000-S series and only in pure AC measurement, the IST ULSTRASTAB can
provide the power for 6 channels. For DC measurement or for AC and DC combined, the IST
ULSTRASTAB provides the power for 4 channels maximum.

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5.1 FRONT PANEL
The front panel includes indicators for each transducer channel.
FIGURE 1: An overview of the front panel, with a close-up of the indicator panel
5.2 INDICATOR PANEL
The illuminated indicator panel has seven fields that are lit in the following modes:
POWER:
•Green light - Mains power is applied.
•No light – Unit is in off-state.
CHANNEL 1-6:
•Green light - Indicated transducer is attached and Normal Operation signal is ok.
Transducer is operational.
•Red light - Indicated transducer is attached and Normal Operation signal is NOT
ok.
•No light – No transducer is connected.

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5.3 BACK PANEL
The IST ULTRASTAB unit provides 9-pin D-Sub female connector for up to six transducers and
the measured secondary current from each transducer is looped to a set of output jacks (4 mm
standard “banana” terminals) for the current output version.
For the voltage output, the secondary current from each transducer flows through the burden
resistance in the corresponding Voltage-Output-Module (VOM).
The status of each individual transducer is presented on a 15-pin D-Sub male connector common
for all six channels.
IMPORTANT:The IST ULTRASTAB unit has NO breaker for switching mains on and off.
Power is supplied to the unit once the mains cable is inserted into the mains inlet and mains
are switched on at the outlet. Indication of active mains is provided by the POWER indicator.
FIGURE 2: Overview of the IST ULTRASTAB back panel
5.4 TRANSDUCER PORT
Each channel is equipped with a 9-pin D-Sub connector that interfaces to LEM transducers. The
pinout is shown below:
Pin 1: Output Current Return
Pin 2: N/C
Pin 3: Ground
Pin 4: Ground
Pin 5: Negative supply -15V
Pin 6: Output Current
Pin 7: N/C
Pin 8: Normal Operation
Pin 9: Positive supply +15V
FIGURE 3: Pinout for 9-pin transducer connector
9-pin D-Sub female UNC 4-40 screw lock

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5.5 CONNECTING THE TRANSDUCERS
The IST ULTRASTAB rack provides 6 9-pin D-Sub connectors on the back panel for connecting
to 6 individual transducers.
Each 9-pin D-Sub connector is used to connect the supply voltage to the DC power input of the
transducer. It also routes the secondary current lines and the status signal from the transducer to
the IST ULTRASTAB unit.
Connect the transducers at the 9-pin D-Sub connectors on the IST ULTRASTAB back panel via
the shielded connection cables which must be ordered separately.
FIGURE 4: Connecting a transducer to IST ULTRASTAB
The following two shielded connection cables are available:
Description
Order number
Shielded connection cable length = 6 meters
71.12.08.000.0
Shielded connection cable length = 10 meters
71.12.13.000.0
TABLE 2: Shielded connection cables
It is recommended to use the connection cables indicated above. It is also possible to configure
your own cable, bearing the following wiring description in mind.
FIGURE 5: Transducer to IST ULTRASTAB connection cable wiring

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To prevent any malfunction that may occur due to the cable/wire voltage drop (i.e., its length and
the wire resistance inside the cable) between the IST ULTRASTAB rack and the transducer, a
cable with at least 7 wires, each having a cross section AWG 22, AWG 23 or ≥0.25 mm², must
be used.
In addition, it is recommended to use shielded cables in order to limit the effects of noise due to
electromagnetic interference (EMI).
5.6 OUTPUT PORT
The measured secondary current or the ±10 V signal is output on a pair of 4 mm safety “banana”
jacks.
Red: Current output or ±10 V Voltage output
depending on IST version.
In current output case, this terminal is connected
directly to pin 6 of the corresponding transducer port
-Out +
Black: Current output return or ±10 V signal ground.
In current output case, this terminal is connected
directly to pin 1 of the corresponding transducer port
FIGURE 6: Output terminals
IMPORTANT: The secondary current path must ALWAYS be closed before applying primary
current, i.e. a terminating burden resistor must be connected.
5.7 VOLTAGE OUTPUT VERSIONS
The following versions with ±10 V output signal are available:
Description Order number
Secondary
output current
Concerned transducers
IST 200-B ULTRASTAB 71.93.44.000.0 ±200 mA IT 200-S, IT 205-S, IT 400-S
IST 400-B ULTRASTAB 71.93.48.000.0 ±400 mA
IT 400-S/SPxx, IT 605-S,
IT 700-S, ITN 600-S
TABLE 3: Voltage output versions

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5.8 STATUS / INTERLOCK
All LEM current transducers generate a status signal, which contains information about the
operational status of the unit. This signal is routed through the IST ULTRASTAB and available in
one 15-pin D-Sub male connector for each channel. The pinout is shown in figure 8.
The status port can optionally be used in any general safety interlock set up circuit.
All signals on the status/interlock connector are optically isolated, photo-couplers type, floating
Collector and Emitter. Depending on how each signal is wired, it can be “Active Low” or “Active
High” as shown below:
FIGURE 7: Status/Interlock port wiring

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In the diagram A, the active low output signal Uout switches to GND when the corresponding
transducer is OK (Normal operation and Green LED is lit). In the same manner, the transistor is
switched off (No current from collector to emitter) to indicate that the corresponding transducer
is not OK. Consequently, Uout switches to UCand the corresponding Green LED is OFF,
whereas the corresponding Red LED is lit.
In the diagram B, the active high output signal (Uout switches to UCwhen the corresponding
transducer is OK (Normal operation and Green LED is lit). In the same manner, the transistor is
switched off (No current from collector to emitter) to indicate that the corresponding transducer
is not OK. Consequently, Uout switches to GND and the corresponding Green LED is OFF,
whereas the corresponding Red LED is lit.
The power supply voltage UCmust be between 4 V and 45 V DC and the resistor value R must
be chosen between a minimum value Rmin and a maximum value Rmax.
Some recommended standard values of Rare given in the following table:
Power supply Voltage UC
R
min
(kΩ)
R
max
(kΩ)
RStandard Values ±5%
5 V
0.153
2.3
180 Ω, 1kΩ, or 2.2 kΩ
12 V
0.386
5.8
470 Ω, 2.2 kΩor 4.7 kΩ
24 V
0.786
11.8
1 kΩ, 2.2 kΩor 10 kΩ
TABLE 4: Recommended standard values of R
Status Connector:
Power Status: Pin 1 Collector & Pin 5 Emitter
Channel 1: Pin 9 Collector & Pin 13 Emitter
Channel 2: Pin 2 Collector & Pin 6 Emitter
Channel 3: Pin 10 Collector & Pin 14 Emitter
Channel 4: Pin 3 Collector & Pin 7 Emitter
Channel 5: Pin 11 Collector & Pin 15 Emitter
Channel 6: Pin 4 Collector & Pin 8 Emitter
FIGURE 8: Pinout for 15-pin status connector
15-pin D-Sub male UNC 4-40 screw lock

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6 INSTALLATION
Before applying mains power to the unit, check that the specified AC voltage and current are
available, and that the ambient temperature is within the range specified in this manual.
IMPORTANT:The IST ULTRASTAB is passively cooled by airflow entering the perforated
areas in top, sides, and bottom of the cabinet. Make sure that these holes are not blocked as
this will severely affect the performance of the unit.
Establish the Ground connection according to the local authority regulations and the requirements
of the equipment via the AC power plug.
Mount the shielded connection cables between the electronics crate and the transducers. Use
channel 1 to 3 as default. Check that all plugs are pushed fully in place.
The transducer itself may be installed in any orientation but be careful to consider potential
influence of the physical layout of the setup with surrounding bus bars, transformers etc.
A typical 3-channel setup is shown below:
FIGURE 9: IST ULTRASTAB in a typical 3-channel current output application
Ip1
Ip2
Ip3
Is1
Is2
Is3

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7 OPERATING INSTRUCTIONS
When instructions for installation are complete, the IST ULTRASTAB can be switched ON.
Apply mains power by inserting the cable plug in the mains inlet and by switching on mains at
the outlet. The green indicator LED “Power” will be lit.
Observe that the channel indicators turns on GREEN where transducers are connected and
remains unlit where no transducer is connected. If a channel indicator turns RED please go
through the setup, check that all cables are securely fastened etc. – it may also be that the
transducer is faulty.
If any problem persists during this operation, please immediately take contact with LEM.
Further application information for high precision transducers can be found in their respective data
sheets which can be easily obtained on www.lem.com or by contacting your local representative.
IMPORTANT: In order to avoid excessive saturation of the iron core in the transducer head,
the IST ULTRASTAB unit should ALWAYS be switched on before the actual primary current
source is applied to any of the attached transducers.
IMPORTANT: The secondary current path must NEVER be opened when primary current is
applied. This means that cables to/from the current output port (banana jacks) should never
be detached during operation.
8 MAINTENANCE
The IST ULTRASTAB assembly does not require any maintenance under normal operation.