SIM200™

Non test side resistance leakage = 15 MΩ

± 1.5 kΩ for resistances <15 kΩ

± 1.5 kΩ for resistances <15 kΩ

Resistance Measurement Accuracy - xQx

Isolation excluding input impedance of IMD.

Accuracies for operation under nominal conditions, battery voltage ≥ 15 V.

Accuracy under 0 V operation ≤ 15% error for fault detection, compliant with IEC 61557-8.

CAN Interface

SIM200 module utilizes a simple CAN “polling” interface in which the system controller requests desired information according to a library of

“Operation Codes” or “Op Codes”.

The CAN interface can be utilized by the system to obtain detailed system status information, as well as detailed diagnostic information.

Description

Op_Code

Get isolation state

0xE0

Get isolation resistances

0xE1

Get system Y-capacitances

0xE2

Get HV rail measurements

0xE3

Get battery voltage

0xE4

Get error flags

0xE5

Get dynamic electrical isolation

0xE6

Get dynamic capacitive energy

0xE7

Example Op Codes

SIM200 Reported Uncertainties

Along with the isolation resistance and system Y-capacitance estimate, the SIM200 reports an “uncertainty” value. The uncertainty measure

provided should be understood as a measure of the suitability of the model (or lack of suitability), rather than as a measure of accuracy.

In application, it is suggested that this uncertainty may be used in the following ways:

Estimates with high levels of uncertainty should be ignored. A recommended threshold is ≤ 10% uncertainty for the estimate of interest. This is

already handled on the SIM200 by the “High Uncertainty” status bit, which is set to 1 when one or more isolation estimate uncertainty is above

10% (see CAN protocol for detail).

For most applications monitoring the resistive leakage path, no direct monitoring of the uncertainties is needed – only applicable monitoring of

the status byte.

For applications that require more certainty in the isolation estimate, an uncertainty threshold of less than 10% can be used.

For sudden changes in the isolation parameters the IMD is monitoring, the uncertainty on the isolation parameters will spike until the change

has settled and the IMD can resolve the parameters. A spike in the uncertainties (in a properly installed SIM200) indicates a sudden change in

the isolation parameters or measurement circuit.

0

1

2

3

4

5

6

15

40

1000

5000

15000

xQx Absolute Error - Asymmetrical

Absolute Error 1.2 uF

Absolute Error 6.2 uF

Absolute Error 14.2 uF

Test Resistance (kΩ)

5

3

3

3

5

3

0

1

2

3

4

5

6

15

40

1000

5000

15000

xQx Absolute Error - Symmetrical

Absolute Error 1.2 uF

Absolute Error 6.2 uF

Absolute Error 14.2 uF

Test Resistance Rn = Rp (kΩ)

5

3

3

3

3

5

5

5