Numeric Motor Protection Relay for LV Motors (LCD – Split Module) : mPRO-200

In mPRO-200 the protection feature is based on mathematical model of motor thermal image. The motor thermal overload protection function calculates the heat accumulated in the rotor and stator based on the effective heating current , integrated over a time. The relay appropriately takes in to account cooling of the winding by gradually emptying the accumulated current bucket. The relay displays the status of thermal condition of motor windings as a % of maximum permissible Thermal capacity. If inverse overload characteristic (lN\/) is selected then only the effect of thermal memory phenomenon is enabled. If current in any of the three phases exceeds over-current setting l> as well as accumulated thermal capacity (Thermal MEM) is >=100% then mPRO will trip the motor. If thermal memory is accumulated then Relay Contact Reset depends on Relay Reset selection (AUTO/MANUAL) and Thermal Reset selection (Disable/Enable).

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Feature of mPRO-200

  • Monitors the flow of the current from which the following operational conditions of the motor are gathered:-STOP, START & RUNNING
  • Allows users to enable fail-safe operation for DO-1 contacts.
  • When mPRO generates a trip signal, the DO-1 relay coil is de-energized
  • Short circuit protection is provided by tripping the relay when the motor operating current in any ofthe three phases exceeds the value corresponding to the Short circuit setting
  • During a phase loss, the motor winding current will increase by 150% or more
  • Operational Current: 0.2 – 8.0 x IFL
  • Frequency Range: 50/60 Hz
  • Design Standards (As per IEC 60947): IEC 60947-4-1, IEC 61000-3-2, IEC 61000-3-3, IEC 60947-4-1
  • The phase unbalance condition is checked only during the running condition of the motor
  • In phase reversal, the relay trips after set time tPhRev. It helps to protect a three phase motor while installation
  • During motor start-up, a locked rotor is detected with the state of increased phase current above the set value (LKR) even after the set start time (tLKR)

Specification of mPRO-200

  • Uv: 80-280vac/110-300vdc
  • In: 0.25-5a
  • Product Type: Display Module
  • Fn: 50/60hz
  • MPN: Does Not Apply
  • Contact rating: 6a@250vac,24vdc
  • UPC: Does Not Apply

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