What is a EOCR?

Acronym. Definition. EOCR. Electronic Order Confirmation Record (Global Online Bibliographic Information)

What is the function of EOCR?

EOCR has a wide current adjustment range over 10:1. It enables three types of model to cover the widest range from 0.1A up to 600A and inventory control to be much easier….

Over-current Protection	Phase Loss Protection
Looping Option	External Current Transformer Option
Manual Instantaneous Rest	Low Energy Consumption

What is EOCR relay?

next. BCH EOCR is a microprocessor based motor protection Relay with multiple protections including overload single phasing, phase reversal, phase unbalanace, lock rotor, ground fault, under current which protect motors from premature failures in extreme conditions.

What is d time in EOCR?

What is D-Time? D-Time is the starting Delay Time taken by a Motor to reach its normal running current. Normally during starting the Motor draws much higher levels of current and the D-Time setting is to ensure that the EOCR does not trip the motor before this time has elapsed.

How do I reset my EOCR?

EOCR can be reset by ESC button only. Auto Reset . The time setting range is up to 20 minutes (20n).

What is thermal overload relay?

Thermal overload relays are protective devices. They are designed to cut power if the motor draws too much current for an extended period of time. To accomplish this, thermal overload relays contain a normally closed (NC) relay.

What are 2 types of overload relays?

Overload Relay Types. These are classified into two types namely thermal overload relay and magnetic overload relay.

Why are thermal overloads used?

The function of a thermal overload relay, used in motor starter circuits is to prevent the motor from drawing excessive current which is harmful to motor insulation. It is connected either directly to motor lines or indirectly through current transformers.

What is DOL starter?

The simplest form of motor starter for the induction motor is the Direct On Line starter. The Direct On Line Motor Starter (DOL) consist a MCCB or Circuit Breaker, Contactor and an overload relay for protection. Electromagnetic contactor which can be opened by the thermal overload relay under fault conditions.

How is overload setting calculated?

The overloads are determined using 125% of the FLA, 7A x 1.25 = 8.75A. The maximum allowable size for the overloads is 9.8A. The overloads can be sized at 140% of the FLA if the overloads trip at rated load or will not allow the motor to start, 7A x 1.4 = 9.8A.

What are the two types of thermal overloads?

Thermal overload relays are classified into two types namely solder pot as well as a bimetal strip.

How do thermal overloads work?

A thermal overload relay works on the heat produced by the excessive overload current. The heat produced by the overload current is utilized to trip the motor circuit. These are mostly used for protection of low-voltage squirrel cage induction motors or DC motors of lower output rating.

Is DOL Star or Delta?

In case of star delta starter the starting current is reduced. It gives the starting current which is about 30% of the starting current provided by DOL. This is also a big advantage of star delta starter….

DOL Starter	Star Delta Starter
Motor starts on its full starting torque	Starts motor on third of its starting torque

How do you size an overload?

You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52].

What is overload factor?

The purpose of the overload factor, KO, is to account for externally applied loads in excess of the nominal tangential load Wt. A typical example is the variation in torque from an internal combustion engine. Values for KO tend to be derived from extensive experience of a particular application.

What is the difference between a thermal overload and a magnetic overload?

The major difference between thermal type as well as magnetic type relays is that magnetic type overload relay is not responsive toward ambient temperature. Generally, these are used in the areas where extreme changes exhibit within the ambient temperature.

What are the three designs of thermal trip overload units?

There are three types of thermal overload relays — bimetallic, eutectic, and electronic.

What is the difference between overload and overcurrent?

Magnetic circuit breakers, fuses and overcurrent relays are commonly used to provide overcurrent protection. Overload protection is a protection against a running overcurrent that would cause overheating of the protected equipment.

What are five categories of motor control?

There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application. From left to right, an AC servo motor, a DC brush-less motor, and a stepper motor.