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7November2022/Version 8
LEM reserves the right to carry out modifications on its transducers,
in order to improve them.
LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrin
www.lem.com
ITZ 2000-SPR FLEX ULTRASTAB
The table shown below summarizes various frequency values and the typical value of over current trip level to detect over current
state:
Primary current frequency (Hz)
Typical over current trip level to detect over current state
DC (0 Hz))
120 % of
I
P N
DC
1
130 % of
I
P N
DC
1.5
140 % of
I
P N
DC
50
160 % of
I
P N
DC
800
170 % of
I
P N
DC
1600
186 % of
I
P N
DC
Under these conditions:
- The signal Status (Contact between Pin 4:C and Pin 9:E) switches off, this signal becomes open (No current from collector to
emitter) to indicate that the unit is not OK.
- The status green LED located on the front panel switches off (fault state)
- The transducer is protected against damage that the over current primary AC may cause to the electronics.
The transducer will automatically starts again to work when the primary AC peak becomes lower than the trip level indicated in
the table above.
Transducer head description
Connect the transducer head to the electronics rack using the supplied transducer head cable and mount the programming plug
in the 25-pin D-Sub connector on the transducer head.
The side of cable where there is the ferrite must be connected to the rack electronics.
The transducer head cable is available in three lengths: 10, 20 and 30 meters.
Programmability
The programmability consists of a programming plug connected in the 25-pin D-Sub connector on the transducer head as shown
in the figure below:
It allows the conversion ratio to be changed. By modifying the conversion ratio, the nominal primary current can be decreased
while keeping the secondary output current constant. The burden resistor is unchanged.
The programming is done by dividing the secondary winding in multiple windings. The programming plug connects the individual
windings in series summing up the number of windings to obtain the desired conversion ratio.
In the ITZ 2000-SPR head, the nominal primary current can be programmed in the range of 125 A to 2000 A with a resolution of
125 A.
The most commonly available programming plugs are:
- ITZ PR 2000 A–125 A
- ITZ PR 2000 A–375 A
- ITZ PR 2000 A–1875 A
- ITZ PR 2000 A–2000 A
For more information, see section “ITZ mandatory accessories” on
.
