Under-frequency monitoring relay MS2H34-S

over-frequencypanel-mountadjustable

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.