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English | SNAP-AIPM-3 Three-phase Power Monitoring Module, 85-300 V RMS and 0-5 A RMS Inputs for Each Phase |
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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) (–0.2 dB at 660 Hz; –3 dB at 1.89 kHz) nominal | Time constant = 70 µs (analog front end) (–0.2 dB at 660 Hz; –3 dB at 1.89 kHz) nominal |
| Input Resistance – 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) (–0.2 dB at 660 Hz; –3 dB at 1.89 kHz) nominal | Time constant = 105 µs (analog front end) (–0.2 dB at 660 Hz; –3 dB at 1.89 kHz) nominal |
| Input Resistance – 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 | > –120 dB at 60 Hz | > –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 | 0–1500 W (from synchronous measurement of volts and amps) | W (from synchronous measurement of volts and amps)** |
| Volt Amps | 0–1500 VA (VRMS x ARMS) | VA (VRMS x ARMS)** |
| 1-second Energy Sum | 0–4500 joules (true power sum ABC, signed) | Joules (true power sum ABC, signed)** |
| 1-second abs Energy Sum | 0–4500 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 0–250 V and for SNAP-AIPM-3, 0–10 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. | ||
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