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Beschreibung

SNAP-AIPM-3 Three-phase Power Monitoring Module, 85-300 V RMS and 0-5 A RMS Inputs for Each Phase

SNAP-AIPM-3 analog input module helps you measure and control power usage in your facility. The SNAP-AIPM-3
simultaneously measures volts AC RMS and amps AC RMS for each of the three phases, using current transformers
(CTs) with a 1-5 amp secondary.

The module calculates true power and volt-amps for each phase and, in addition, calculates true power sums for all
three phases.

Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted
controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for
PC-based control or for use as intelligent remote I/O for an Allen-Bradley RSLogix PLC system, such as ControlLogix,
MicroLogix, or CompactLogix.

When these modules are used as part of a SNAP PAC System running a PAC Control strategy, the strategy logic can
automatically perform the calculations and respond to problems.

Compatibility: SNAP-AIPM-3 modules work with SNAP PAC brains and R-series controllers. They require brain firmware
version 9.1b or newer and PAC Project 9.1a or newer.

Also see the SNAP-AIPM-3V module, which uses CTs with a 0.333 VAC secondary.

If you need to monitor single-phase power, use the SNAP-AIPM instead.

NOTE: SNAP-AIPM-3 modules manufactured before April 2011 had different input ranges (0-250 VAC and 0-10 A).
Specs were changed to allow connection to electrical systems and equipment at higher voltages (for example, lighting
systems at 277 volts) and to double the resolution of current inputs. Before wiring or scaling any SNAP-AIPM-3, check
the input range printed on the module. Scaling examples are in the data sheet. Older modules can be exchanged for
newer ones; contact Product Support for information or answers to questions.

	SNAP-AIPM-3	SNAP-AIPM-3V
Voltage Inputs (each voltage channel)
Recommended Input Range Scaled Input Range	85 to 300 VAC RMS* 0 to 300 VAC RMS	85 to 300 VAC RMS* 0 to 300 VAC RMS
Input Over Range	To 330 volts	To 330 volts
Resolution	12 mV	12 mV
Accuracy (47 to 63 Hz)	(When used within recommended range) ± 0.2 V plus ± 0.2% reading (at full scale = ± 0.7 V or 0.28%)	(When used within recommended range) ± 0.2 V plus ± 0.2% reading (at full scale = ±0.2 V + ±0.8 V = 1.0 V)
RMS Integration Time/ Data Freshness	1000 ms (synchronous with current measure- ment)	1000 ms (synchronous with current measure- ment)
Input Filtering	Time constant = 70 µs (analog front end) (â€“0.2 dB at 660 Hz; â€“3 dB at 1.89 kHz) nominal	Time constant = 70 µs (analog front end) (â€“0.2 dB at 660 Hz; â€“3 dB at 1.89 kHz) nominal
Input Resistance â€“ Single Ended	1 Megohm NOTE: Because both channels share the same reference terminal, polarity must be observed when connecting the current channel.	1 Megohm NOTE: Because both channels share the same reference terminal, polarity must be observed when connecting the current channel.
Maximum Input	330 V non-operating	330 V non-operating
Current Inputs (each current channel)
Input Range	0 to 5 AC amps RMS*	0 to 0.333 VAC current transformer input
Input Over Range	To 5.5 amps (Reading is not reliable over 5.5 A)	To 0.366 VAC
Input Overload	15 A continuous, non-operating	5 VAC continuous, non-operating
Resolution	200 µA	13.3 µV AC
Accuracy (47 to 63 Hz)	± 4 mA plus ± 0.2% reading (at full scale = ± 28 mA or 0.28%)	± 266 microvolts plus 0.2% of reading (at full scale = 266 µV + 667 µV = 933 µV = 0.28%)
RMS Integration Time/ Data Freshness	1000 ms (synchronous with voltage measure- ment)	1000 ms (synchronous with voltage measure- ment)
Input Filtering	Time constant = 105 µs (analog front end) (â€“0.2 dB at 660 Hz; â€“3 dB at 1.89 kHz) nominal	Time constant = 105 µs (analog front end) (â€“0.2 dB at 660 Hz; â€“3 dB at 1.89 kHz) nominal
Input Resistance â€“ Single Ended	0.005 Ohm NOTE: Because both channels share the same reference terminal, polarity must be observed when connecting the voltage channel.	0.005 Ohm NOTE: Because both channels share the same reference terminal, polarity must be observed when connecting the voltage channel.
Maximum Input	15 A continuous, non-operating	5 VAC continuous, non-operating
Calculated Channels
True Power and Volt- Amps Range	True power: 1500.0 Watts. Volt-amps: 1500.0 volt-amps (inputs = 300 volts and 5 amps)	True power and volt-amps are calculated from 300 volts and the full-scale current input of your 0.333 VAC output CT.
Over Range	1650 Watts true power or 16,500 counts volt- amps	Depends on CT selection
Accuracy:
True Power Volt-Amps	± 0.6% reading (at full scale = ± 15 Watts) ± 0.6% reading (at full scale = ± 15 VA)	± 0.6% reading ± 0.6% reading
Resolution	100 mW with default scaling	Depends on CT selection
AC Common Mode Rejection	> â€“120 dB at 60 Hz	> â€“120 dB at 60 Hz
Maximum Operating Common Mode Voltage	300 VAC	300 VAC
Power Requirements	5.0 VDC ± 0.15 VDC at 100 mA	5.0 VDC ± 0.15 VDC at 100 mA
Ambient Temperature:
Operating Storage	0 to 70 °C -25 to 85 °C	0 to 70 °C -25 to 85 °C
Agency Approvals	CE, RoHS, DFARS	CE, RoHS, DFARS
Warranty	Lifetime	Lifetime
Calculated Outputs
True Power	0â€“1500 W (from synchronous measurement of volts and amps)	W (from synchronous measurement of volts and amps)**
Volt Amps	0â€“1500 VA (VRMS x ARMS)	VA (VRMS x ARMS)**
1-second Energy Sum	0â€“4500 joules (true power sum ABC, signed)	Joules (true power sum ABC, signed)**
1-second abs Energy Sum	0â€“4500 joules (true power sum of absolute value of each A, B, and C, always positive)	Joules (true power sum of absolute value of each A, B, and C, always positive)**
Inputs on older modules were 0â€“250 V and for SNAP-AIPM-3, 0â€“10 A. Before wiring or scaling, check printed information on the module to make sure you are using the correct voltage and current. Contact Opto 22 Product Support with any questions. *Values depend on CT selection.