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The 2H34-S Series relay is a frequency monitoring relay with four stages of adjustable frequency pick up & drop out points. Each frequency set point can be set for under or over frequency operation & has an independent time delay driving an output relay. An undervoltage lockout is used to disable the four frequency outputs when the voltage falls below a preset level. Each of the four setting stages has a rate of change of frequency (ROCOF) element with an independent time delay.

The dF/dt element is available to operate as an AND or an OR  logic function with the frequency element driving a common output contact per stage. A separate Under Voltage & Over Voltage stage are provided for alarm functions.

The 2H34-S relay is built on the Micro MATRIX-S digital platform. The standard Micro MATRIX human machine interface (HMI) is combined with fully solid state frequency sensing & measuring circuitry to provide high accuracy, simple set up & flexible operation. Self-monitoring is carried out by hardware & software watchdogs.  A USB programming port is provided for ease of establishing relay settings using a PC.

Changes introduced on the 2H34-S

• Case length reduced by 18mm to suit 4M56-S case;

• LED backlighting to reduce EMC emissions – contrast adjustment no longer required;

• Front panel USB programming port to increase data transfer speed and improve compatibility with notebook PC’s;

• Network communications port is now optional to maintain low cost of base model;

• Network communication port maintained the optically isolated RS485 serial port but the RS232 configuration option has been deleted;

• New current and voltage channels to improve measurement stability;

• New status input option covering 18-275V AC and 300V DC range;

• Updated switchmode power supply to reduce EMC emissions and improve transient overload protection;

• Surface mount production technology to allow increased component density for additional functionality now and in the future.
   

What has not changed from the 2H34

• I/O and basic functionality has been maintained;

• Basic menu structure and operation has been maintained;

• Electrical terminal mapping has not changed allowing existing wiring diagrams to be maintained;

• Compatibility with existing application software back to version 0500 maintained;

• Compatibility with existing uMATRIXwin programming software maintained;

• Modbus RTU network communication protocol maintained Case size 4 has been maintained although the length has been reduced.

• Made in Australia