SM 1238 Energy Meter 480 V AC analog input module

General information

Product type designation

SM 1238, AI energy meter 480 V AC

HW functional status

From FS02

Firmware version

V2.0.1

Product function

• Voltage measurement

Yes

• — with voltage transformer

Yes

• Current measurement

Yes

• — without current transformer

No

• — with current transformer

Yes

• Energy measurement

Yes

• Frequency measurement

Yes

• Power measurement

Yes

• Active power measurement

Yes

• Reactive power measurement

Yes

• I&M data

Yes; I&M 0

• Isochronous mode

No

Engineering with

• STEP 7 TIA Portal configurable/integrated from version

V13 SP1

Operating mode

• cyclic measurement

Yes

• acyclic measurement

Yes

• Acyclic measured value access

Yes

• Fixed measured value sets

Yes

• Freely definable measured value sets

No

CiR - Configuration in RUN

Reparameterization possible in RUN

Yes

Calibration possible in RUN

Yes

Installation type/mounting

Mounting position

Horizontal, vertical

Supply voltage

Design of the power supply

from CPU

Type of supply voltage

DC

Input current

Current consumption, max.

180 mA

Power loss

Power loss, typ.

0.75 W

Address area

Address space per module

• Address space per module, max.

124 byte; 112 byte input / 12 byte output

Time of day

Operating hours counter

• present

Yes

Analog inputs

Cycle time (all channels), typ.

50 ms; Time for consistent update of all measured and calculated values (cyclic und acyclic data)

Interrupts/diagnostics/status information

Alarms

• Diagnostic alarm

Yes

• Limit value alarm

Yes

• Hardware interrupt

No

Diagnostics indication LED

• Monitoring of the supply voltage (PWR-LED)

Yes

• Channel status display

Yes; green LED

• for channel diagnostics

Yes; red Fn LED

• for module diagnostics

Yes; green/red DIAG LED

Integrated Functions

Measuring functions

• Measuring procedure for voltage measurement

TRMS

• Measuring procedure for current measurement

TRMS

• Type of measured value acquisition

seamless

• Curve shape of voltage

Sinusoidal or distorted

• Buffering of measured variables

Yes

• Parameter length

74 byte

• Bandwidth of measured value acquisition

2 kHz; Harmonics: 39 / 50 Hz, 32 / 60 Hz

Measuring range

• — Frequency measurement, min.

45 Hz

• — Frequency measurement, max.

65 Hz

Measuring inputs for voltage

• — Measurable line voltage between phase and neutral conductor

277 V

• — Measurable line voltage between the line conductors

480 V

• — Measurable line voltage between phase and neutral conductor, min.

0 V

• — Measurable line voltage between phase and neutral conductor, max.

293 V

• — Measurable line voltage between the line conductors, min.

0 V

• — Measurable line voltage between the line conductors, max.

508 V

• — Internal resistance line conductor and neutral conductor

3.4 MΩ

• — Power consumption per phase

20 mW

• — Impulse voltage resistance 1,2/50µs

1 kV

• — Measurement category for voltage measurement in accordance with IEC 61010-2-030

CAT II; CAT III in case of guaranteed protection level of 1.5 kV

Measuring inputs for current

• — measurable relative current (AC), min.

1 %; Relative to the secondary rated current 5 A

• — measurable relative current (AC), max.

100 %; Relative to the secondary rated current 5 A

• — Continuous current with AC, maximum permissible

5 A

• — Apparent power consumption per phase for measuring range 5 A

0.6 VA

• — Rated value short-time withstand current restricted to 1 s

100 A

• — Input resistance measuring range 0 to 5 A

25 mΩ; At the terminal

• — Surge strength

10 A; for 1 minute

• — Zero point suppression

Parameterizable: 2 ... 250 mA, default 50 mA

Accuracy class according to IEC 61557-12

• — Measured variable voltage

0,2

• — Measured variable current

0,2

• — Measured variable apparent power

0.5

• — Measured variable active power

0.5

• — Measured variable reactive power

1

• — Measured variable power factor

0.5

• — Measured variable active energy

0.5

• — Measured variable reactive energy

1

• — Measured variable neutral current

0.5; calculated

• — Measured variable phase angle

±1 °; not covered by IEC 61557-12

• — Measured variable frequency

0.05

Potential separation

Potential separation channels

• between the channels and backplane bus

Yes; 3 700V AC (type test) CAT III

Isolation

Isolation tested with

2 300V AC for 1 min. (type test)

Standards, approvals, certificates

CE mark

Yes

CSA approval

Yes

UL approval

Yes

cULus

Yes

FM approval

Yes

RCM (formerly C-TICK)

Yes

KC approval

Yes

Marine approval

Yes

Ambient conditions

Ambient temperature during operation

• horizontal installation, min.

-20 °C

• horizontal installation, max.

60 °C

• vertical installation, min.

-20 °C

• vertical installation, max.

50 °C

Dimensions

Width

45 mm

Height

100 mm

Depth

75 mm

Weights

Weight, approx.

165 g

Other

Data for selecting a current transformer

• Burden power current transformer x/1A, min.

As a function of cable length and cross section, see device manual

• Burden power current transformer x/5A, min.

As a function of cable length and cross section, see device manual