True RMS Current Monitor

The Model 27 True RMS Current Monitor provides precise current measurement and control for industrial applications. Its True RMS sensing capability ensures accurate readings across various waveforms, critical for maintaining system integrity. With an input range extending from 0.5A to 1200A via external CTs, it accommodates diverse system requirements, from low-current detection to high-current protection. Users can configure high and low trip delays from 0 to 20 seconds, along with adjustable hysteresis from 1 to 15%, providing tailored protection against overcurrent or undercurrent conditions. The unit supports both automatic and manual restart options, enhancing operational flexibility and minimizing downtime. Its robust design, featuring a Lexan 920 Polycarbonate enclosure and DIN Rail mounting, ensures reliable performance in demanding industrial environments. This monitor delivers essential data and control for optimized system operation.

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Specifications

Input AC Current Range	0.5A - 1200A with External CT
Input AC Current Range (at Terminals)	0.5A - 5A at Terminals
Input Amps	5A
Input Frequency	50/60Hz (400Hz optional with jumper)
Input DC Power	24 Volts, 2 watts
Output Rating (Resistive)	240V AC, 10A
Output Rating (General Use)	120V AC, 4A
Output Rating (General Use)	240V AC, 2A
Output Rating (Pilot Duty)	C300
Max Voltage on Current Terminals	600V
Start-up Delay	5 secs. Min. or Automatic reset delay setting (to allow for solid lock)
Output Contacts	SPDT x 2 10 Amps @ 240VAC
Repeat Accuracy	± 0.5% (fixed conditions)
Reset Type	Manual or Automatic
Expected Relay Life (Mechanical)	10 million operations
Expected Relay Life (Electrical)	100,000 min. at rated load
Operating Temperature	-20°F to +130°F
Humidity Tolerance	0-97% w/o condensation
Enclosure Material	Lexan 920 Polycarbonate UL 94 V-0 1.5 mm UL E45329
Mounting	DIN Rail 35mm
Display Accuracy	+/- 0.5%
Display Update Rate	updated every second and re-initialized every 30 seconds
Config: High current	Enable/Disable
Config: High current Set Range	Low Set + 1% to 1200A in 0.5A steps
Config: High trip delay	0 to 20.0 seconds in 0.1Sec steps
Config: Low current	Enable/Disable
Config: Low current Set Range	1A to High Set -1% in 0.5A steps
Config: Low trip delay	0 to 20.0 seconds in 0.1Sec steps
Config: Relay operation	Current High/Low option, Separate High/Low relays, DPDT, Other faults DPDT
Config: Relay operation on fault	De-energize on fault, Energize on fault
Config: High/Low Hysteresis range	As a % of set point 1 to 15% in 1% increments
Config: External CT ratio	5:5 to 1200:5
Config: Start-up delay	2 to 15 seconds
Config: Restart	Automatic or Manual
Config: High or No High Restart when Automatic	High Restart, No High Restart
Config: Automatic Restart Delay range	1 to 300 Minutes in 1 Minute steps

FAQs

What is the current monitoring range of the Model 27 True RMS Current Monitor, and how is it achieved for high currents?

The Model 27 monitors AC current from 0.5A to 1200A. For currents exceeding 5A at the terminals, an external Current Transformer (CT) is utilized, supporting ratios from 5:5 to 1200:5.

What are the output contact specifications for the Model 27 monitor?

The unit features two SPDT output contacts, each rated for 10 Amps at 240V AC resistive load. These contacts provide control for various industrial applications.

How can trip delays and restart behavior be configured on the Model 27?

High and low trip delays are configurable from 0 to 20.0 seconds in 0.1-second steps. The restart function can be set to either automatic or manual, with automatic restart delays adjustable from 1 to 300 minutes.