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DC Insulation Monitoring Device for Unearthed Systems

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The SIM200 Insulation Monitoring Device (IMD) is designed for continuous, active monitoring of unearthed (Isolated Terra) DC systems, making it well-suited for applications such as charging stations, electric cars, and any system operating at more than 60 VDC.

The SIM200 Module, certified by UL2231, fulfills high safety requirements and provides quick, reliable detection of electrical risks. It employs a unique signal injection algorithm to provide continuous, real-time insulation monitoring ("Always On").

The SIM200 has robust self-diagnostics to ensure monitoring performance, a CAN 2.0B interface for detailed system data, programmable warning alarms, a fault alarm at 100 Ω/V, and customizable CAN ID settings for system integration.

Industries

Automotive
Truck and Bus

Features

Safety

Continuous insulation monitoring (always on)
The digital output indicates an internal IMD fault
Dedicated fault state output (one digital out and one PWM)
Capacitive energy monitoring

Usability

Configurable CAN ID
Fault alarm at 100 Ω/V
Configurable warning alarm level

Performance

Modular CAN 2.0B interface
Effective self-diagnosis of monitoring capabilities

Specifications

Power and General Characteristics. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit		Conditions/comments
Operational supply voltage	9	12-24	30	V
Operational supply current	-	60 28	-	mA		12 V supply 24 V supply
Operating temperature range	-40		+85	°C
Input impedance rin	-	2720 2720 1000 272	-	kΩ	xNx xKx xPx xQx	Input impedance varies based on the device voltage configuration (hardware configured). The input impedance of the monitor is the parallel impedance imposed by the SIM200 between each rail and the chassis. See “Part Numbering” for more information.

Isolation Monitoring Function. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit		Conditions/comments
Time to initial isolation estimate	-	4.5	5.5	Seconds
Response time to warning condition	4.3	-	5	Seconds		Applies to the detection of a warning (500 Ω/V) condition from a stable initial state under typical operating conditions.
Response time to sault condition	-	5.3	5.8	Seconds		Applies to the detection of a fault (100 Ω/V) condition from a stable initial state under typical operating conditions.
Response time to short condition	-	-	6.5	Seconds		Time needed to confirm short condition, for equivalent resistances for each variant see “Reporting of Short Condition”.
Application voltage range (Vb)	1000 600 300 60	1363 1000 510 140	1568 1150 582 161	V	xNx xKx xPx xQx	“Typical” value is the max nominal system voltage to meet IEC 61557-8 and allow for operation at 115 % of nominal.
Total Y-capacitance	0.2 0.2 0.4 2	1.2 1.2 4.2 6.2	4.2 4.2 14.2 14.2	uF	xNx xKx xPx xQx	See “Y-Capacitors” section for more information. If higher Y-capacitance is desired, contact Sensata for further discussion.

Isolation Resistance Measurements. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit		Conditions/comments
Reporting range	0	-	2720 2720 1000 272	kΩ	xNx xKx xPx xQx	The SIM200 provides the total resistance value for each HV rail, including that imposed by the SIM200 module itself, which is the upper bound for system insulation.
Measurement resolution	-	1	-	kΩ
Measurement accuracy	-	± 5 ± 5 ± 5 ± 3	± 15 ± 15 ± 15 ± 5	%		Listed accuracies are achieved when system isolation is stable and under typical operating conditions.
Measurement update period	-	250	-	ms
Reporting of short condition	-	8 8 1.5 0.4	-	kΩ	Nx xKx xPx xQx	Short condition will be reported when the isolation resistance of one of the High Voltage rail falls below the listed value.
Reporting of short condition – low voltage mode	-	16 16 3 0.8	-	kΩ	xNx xKx xPx xQx	Low voltage mode when battery voltage < 15 V

Capacitance Measurement. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit	Conditions/comments
Total Capacitance Measurement
Reporting range	0.2	1	-	μF	The total capacitance of the system is defined as the sum of all Y-capacitance in the system.
Measurement resolution	-	1	-	nF
Measurement accuracy	-	± 10	-	%	Typical accuracy is achieved when the system time constant is between 0.5 and 1.5 seconds and under typical operating conditions, and capacitive measurement uncertainty is reported < 10 % confidence interval.
Measurement update period	-	250	-	ms

Noise Immunity of Measurements. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit	Conditions/comments
Common mode voltage on the battery terminals	20	-	-	V_PK-PK	No observable effect on isolation resistance value; measured with square, ramp, and sine wave test signals from 1 kHz to 100 kHz. Common mode noise below 1 kHz expected to interfere with isolation resistance measurement.
Differential mode voltage on the battery terminals (battery voltage variations)	-	100	-	V_PK-PK	No observable effect on isolation resistance value; tested with battery-voltage driving profile that has multiple instantaneous voltage changes up to ± 100 V and overall slow battery voltage fluctuation from 910 V to 480 V.

Voltage Measurements. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit		Conditions/comments
Measurement range	± 1627 ± 1168 ± 599 ± 164	± 1652 ± 1186 ± 608 ± 167	-	V	xNx xKx xPx xQx	Applies to HV rail measurements with respect to chassis
Offset error	-100	± 50	+100	mV		Over operating temperature range
Gain error	-2	± 0.5	+2	%		Over operating temperature range
Measurement resolution (compact reporting)	-	1	-	V
Measurement resolution (high-resolution reporting)	-	100	-	μV
Measurement update period	-	10	-	ms

Temperature Measurement. Source: Sensata Technologies, Inc.

Parameter	Min	Typical	Max	Unit	Conditions/comments
Absolute measurement error	-5	± 0.5	+5	°C	Over operating temperature range
Measurement resolution	-	10	-	m°C
Measurement update period	-	250	-	ms

Communication and Connectors. Source: Sensata Technologies, Inc.

Parameter	Spec	Speed	Termination
CAN Communication	2.0B	500 or 250 kbit/s	120 Ω termination resistor (optional)

Connectors. Source: Sensata Technologies, Inc.

Parameter	Manufacturer	Position	Part number	Description
COM & power on board	Molex	6	705510040	P1: 6 pos. right angle single header, shrouded connector (2.54 mm) through hole tin
COM & power mating connector	Molex	6	50579406	Use appropriate crimp contacts (available for AWG 22, 24, and 26)
Voltage sensing on board	Molex	2	705510036	J1, J3, J4: MINIFIT JR HDR 02P 94V-0 30AU
Voltage sensing mating connector	Molex	2	50579402	MINIFIT JR RCPT DR SIDETABS 2 CKT 94V-0. Crimp contacts available for AWG 22