CEMP E3H/D and E4H/D Flameproof Brake Motors

Flameproof brake motors with the brake in a separate Ex db enclosure

The CEMP E3H/D and E4H/D series are explosion proof brake motors in IE3 and IE4 efficiency, gas and dust version. The motor enclosure is Ex db flameproof and the brake sits in its own Ex db enclosure, with a terminal box in Ex db or Ex eb. The brochure lists multiple brake torque choices and AC or DC disc brakes with or without a rectifier, which makes the series suitable for cranes, hoists, lifting systems, bulk handling, capstans and winches.

Technical specifications

Materials and options

For frames 63 to 250 and 280 to 355 the endshields and terminal box are cast iron EN-GJL-200, the fan cover and rain cap are steel, the fan is non-sparking thermoplastic or aluminium (brass for mining application motors), the shaft is C45 steel, the rotor is die cast aluminium and the winding is insulation class F or H. Fasteners are galvanized 8.8 or A4 stainless steel, and the brake enclosure and brake terminal box are cast iron. Options include forced ventilation, encoder, stainless steel fan cover and rain canopy, tailor-made auxiliary terminal boxes, C5-M painting, hand brake release, space heater, PTC or Pt-100 sensors and a microswitch.

How the CEMP E3H/D and E4H/D flameproof brake motors work

A brake motor holds a load when the power is off. In this series, a disc brake is fitted at the rear of the motor and is held open by a coil while the motor runs. When the supply is cut, springs close the brake and stop the shaft. Since the motor is for explosive atmospheres, both the motor and the brake sit in separate Ex db flameproof enclosures. The enclosure is built so that an explosion inside cannot ignite the gas outside. The terminal box is available in Ex db or Ex eb form.

Where the E3H/D and E4H/D are used

• Cranes and hoists in hazardous areas.
• Lifting systems and winches.
• Capstans and bulk handling equipment.
• Oil, gas and chemical plants with gas and dust risks.
• Machines that need exact stopping and holding.

Selection checklist for the E3H/D and E4H/D

• Gas group IIB or IIC, or dust group IIIB or IIIC, and the temperature class.
• ATEX category II 2G, II 2D or II 2GD.
• Power of 0.75 to 200 kW, frame size 80 to 250 for IE3 and IE4.
• Poles: 2, 4, 6, 8, or dual speed.
• Supply of 400 V at 50 Hz.
• Brake type: AC or DC disc brake, with or without a rectifier.
• Brake torque choice for the load.
• Ingress protection of IP55, IP56, IP65 or IP66.
• Duty: continuous S1, or S2, S3, S4, S6 or S9.
• Ambient temperature, with the low temperature design for the larger frames.

Installation, commissioning and maintenance notes

Follow the conditions of the certificate, and check the markings against the area classification. Keep the flameproof joints clean and undamaged, since scratches or paint on the joint surface reduce the protection. Do not open the enclosures in the hazardous area while powered. Check the brake air gap and wear at the service intervals, and keep a record of the brake tests. Note the brake supply conditions listed by the maker for each frame.

Requesting a quotation for the CEMP E3H/D and E4H/D

Send the power, the poles, the zone and the brake torque. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

Brake in a separate enclosure

A separate flameproof brake enclosure keeps the brake parts and their wear dust apart from the motor windings.

Options

The options list includes forced ventilation, an encoder, a stainless steel fan cover with a rain canopy and special painting, for demanding sites.

Certification records

Keep the certificate numbers and the conditions of use with the area documents.

Spares and service planning

Plan the spare brake discs, coils and rectifiers with the maintenance team, and record the model and serial numbers from the motor plate when you order.

Documents and quotation

Provide frame or kW, poles, brake torque and AC or DC supply, duty cycle, voltage, zone, gas or dust group, temperature class and ambient range. The brochure gives series data rather than torque tables, so brake torque and certificate scope must be confirmed for the exact motor.

The manufacturer document is attached to this page and listed below. Seven Star LLC is an independent supplier in Muscat and can quote against the model code, quantity and delivery location. Browse more instruments in Electric Motors, or see the CEMP brand page.