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Three Phase Monitoring Relay

Function Monitoring of Buildings, Machines and Systems

Three Phase Monitoring Relay

Machines and systems are operated cost-effectively, therefore important functions must be precisely monitored. The early detection of failures serves to protect man and machine and prevents costly damage. The METZ CONNECT three phase monitoring relay is used for the safe monitoring of your system. By monitoring the most important system parameters, you don‘t only benefit from operation reliability but also from high availability of your system.
The three phase monitoring relay monitors the correct phase sequence and completes failures of individual phase voltages. In addition, the zero conductor is monitored by the PFD3. The device is supplied via the measuring circuit L1-L2-L3-(N). If the phase sequence is correct, the output relay is activated (green LED is on). In case of total failure of a phase or the zero conductor, the output relay returns to its neutral position (green LED is off).


Measuring Ranges

Phase Sequence

Phase Sequence

  • L1-L2-L3 (direction of rotation to the right)
Phase Failure

Phase Failure

  • monitoring of phase voltage in case of complete failure
  • monitoring of zero connection on the device (terminal N)

Benefits

  • space-saving and compact design in a 22.5 mm slim industrial housing
  • two relay contacts for error display and switch off motor contactors
  • power supply direct from measuring circuit

Applications

PFD2-E12

Machines and systems
Monitoring of mobile motors on a right rotating direction.

Application example PFD2-E12

PFD3-E12

Building and home automation
Monitoring of electrical cabinets in critical objects on phase failure.

Application example PFD3-E12

Product overview

Type

PFD2-E12

PFD3-E12

P/N

110292032215

110292032230

Phase Sequence

yes

yes

Phase Failure

yes

yes

Zero connection

-

yes

Supply and Measuring Voltage

L1-L2-L3 | 400 V

L1-L2-L3-N | 400 V / 230 V

Contacts

2 x Changeover Contact / (6 A / 250 V AC)

2 x Changeover Contact / (6 A / 250 V AC)


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