CKSR 50-NP LEM USA Inc, CKSR 50-NP Datasheet
CKSR 50-NP
Specifications of CKSR 50-NP
Related parts for CKSR 50-NP
CKSR 50-NP Summary of contents
Page 1
... CAS / CASR / CKSR series Current Transducers Insulated Highly Accurate Measurements from 1 RMS ...
Page 2
... This is the human nature and allows the progress of technology. With the LTS / LTSR current transducers using the Closed Loop Hall effect technology coupled with a dedicated ASIC (Application Specific Integrated Circuit) specially designed for these products, we thought we had reached the optimal performance, but this was without taking the eternal human nature into account ...
Page 3
... Loop sensitivity”. Given an equal electronic circuit, the zero output of a current transducer (traditionally called “offset” in analogy to operational amplifiers) will be less influenced by changes Fig. 1. Closed Loop Fluxgate Technology used for the CAS / CASR / CKSR current transducers Magnetic Core I P ...
Page 4
... Moreover, the same compact design is used to cover the complete current range from Transducers dimensions Fig. 2. CAS / CASR / CKSR smaller compared to the LTS / LTSR models 4 standard models ( and 50 A models) for in a very each series CAS, CASR and CKSR ...
Page 5
... ± ± ± Output voltage CASR 25-NP is used with internal reference. Fig. 4a. Different nominal current ranges possible according to the primary current circuit configuration (as example: CAS or CASR 25-NP) Variant 1 Variant 2 Expected for: Expected for (85 A max 8.33 A (28.33 A max) PN ...
Page 6
... CKSR 15-NP 15 CKSR 25-NP 25 CKSR 50- The internal reference voltage is provided on a secondary pin or can be forced by an external reference voltage The CKSR has one more primary pin (4 primary pins in total) than the CAS and CASR models (3 primary pins in total) making it incompatible with the footprint of these last 8 models ...
Page 7
... Fig. 6: Differential current measurement ( – I2), many possibilities With that value, and PD2 and CTI of 600 V (group I), this leads to a possible rated insulation voltage of 800 V ...
Page 8
... The Ref pin has two basic functional modes: The first mode is called “Ref out mode”. In this mode, for a primary current the output voltage is equal to the 8 voltage at the Ref pin + an offset depending to the model to cover used (between the voltage output and the Ref pin). ...
Page 9
... Offset drift (25°C .. 85°C) (max) Sensitivity drift (25°C .. 85°C) (max) Linearity (max) Accuracy at +25 °C (max) Accuracy at +85 °C (max) Offset (max) Operating temperature range Nominal current Measuring range Response time Bandwidth (±1 dB) Output voltage noise, 100 Hz..10 kHz (typ.) Output ...
Page 10
... PN time, at Fig. 8. CASR 50-NP Response time to a current step Fig. 10a. Typical common mode behaviour (1200 V of voltage variation applied with /µs) Fig. 10b. CASR 50-NP ; Typical common mode behaviour ; V (1200 V of voltage variation applied with dV/ kV/µ ...
Page 11
... For example, a voltage change of 10 kV/µs in combination with coupling capacity generates a parasitic output current of 100 mA. For the CAS 25-NP for example, this would represent seven times the nominal current. Fig. 10a shows the behaviour at a voltage change of 20 kV/µs and an applied voltage of + 600 V (total voltage variation of 1200 V from – ...
Page 12
... The leakage current from the Ref pin (source) must be lower than 350 µA when the load is connected to a voltage > 2.5 V. • The leakage current from the Ref pin (sink) must be lower than 4.4 µA when the load is connected to a voltage < 2.5 V. ...
Page 13
The following graphs show how the measuring range of each transducer version depends on the external reference voltage value V : REF (V Upper limit -. 44.4 P REF REF (V Lower limit -.6 ...
Page 14
Primary conductor resistance At 25 °C, one primary conductor has a resistance of 0.72 mΩ typ °C, one primary conductor has a resistance of 0.88 mΩ typ. Number of primary Connection conductor ...
Page 15
... Typical applications & conclusion The CAS / CASR / CKSR current transducers have been designed mainly for industrial applications requiring: • Good accuracy especially in temperature (low initial offset, low thermal drifts for gain and offset) • Reduced size: CAS / CASR / CKSR are the smallest on the market in their category (up to nominal current • ...
Page 16
Absolute maximum ratings Parameter Supply voltage Primary conductor temperature ESD rating, Human Body Model (HBM) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. Isolation characteristics Parameter RMS voltage for ...
Page 17
... Theoretical sensitivity Sensitivity error Temperature coefficient of G Linearity error Magnetic offset current ( referred to primary Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) Reaction time @ Response time @ Frequency bandwidth (± 1 dB) Frequency bandwidth (± ...
Page 18
... REF Temperature coefficient OUT P Theoretical sensitivity Sensitivity error Temperature coefficient of G Linearity error Magnetic offset current ( referred to primary Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) Reaction time @ Response time @ Frequency bandwidth (± ...
Page 19
... REF Temperature coefficient OUT P Theoretical sensitivity Sensitivity error Temperature coefficient of G Linearity error Magnetic offset current ( referred to primary Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) Reaction time @ Response time @ Frequency bandwidth (± ...
Page 20
... Electrical data CAS / CASR / CKSR 50- 25° turn kΩ, (internal reference for CASR & CKSR models) unless otherwise noted Parameter Primary nominal current rms Primary current, measuring range Number of primary turns Supply voltage Current consumption Reference voltage @ External reference voltage Output voltage ...
Page 21
PCB footprints CAS Series PCB footprint Pad design according to IPC 2222, IPC 2221 Dimensions in mm 0.034 inches Assembly on PCB Recommended PCB hole diameter 1.3 mm for primary pin 0.8 mm for secondary ...
Page 22
Dimensions (in mm. General linear tolerance ± 0.25 mm) CAS Series Connection Side view CASR Series Connection Side view CKSR Series Connection Side view 22 Bottom view Front view Bottom view Front view Bottom view Front view ...
Page 23
... We design and manufacture high quality and highly reliable products for our customers all over the world. We have delivered several million current and voltage transducers since 172 and most of them are still being used today for traction vehicles, industrial motor drives, UPS systems and many other applications requiring high quality standards. ...
Page 24
Austria Finland LEM Components ETRA Electronics Oy Am Concorde Park 2/F Lampputie 2 A-2320 Schwechat FI-00740 Helsinki Tel. +43 1 903 Tel. +358 207 65 160 Fax +43 1 903 Fax +358 207 65 ...