Dodge (ABB’s power transmission company) developed the motorized torque arm reducer with maintenance in mind. There is a prevailing belief that leaving the belt drives on bulk handling conveyors create an intentional weak spot on the system to prevent overall system damage in case of a jam. For years this belief has been true.
Below are 3 ways to alleviate this problem, with an up-to-date solution that will reduce downtime, maintenance head-aches, spare parts and in one case, provide massive energy savings.
How do you do it?
Case #1: Dodge MTA with ABB Electronic OL
Replace the existing starter with an ABB starter that includes an electronic overload relay.
Electronic overload relays are the alternative to thermal overload relays. An electronic overload relay offers reliable and fast protection for motors in the event of overload or phase failure. Starter combinations are setup together with block contactors and mini contactors. ABB offers one of the widest electronic overload relay assortments on the market. http://www.abb.com/product/seitp329/896c07810ea7fad9c1256d8e00422015.aspx%3Fcountry%3DUS
Characteristics of electronic overload relays range:
- Trip class 10E, 20E, 30E selectable
- Manual or automatic reset selectable
- Trip-free mechanism
- Phase loss sensitivity acc. to IEC/EN60947-4-1
- 2 electrically isolated auxiliary contacts – 1 NO + NC
- Test and STOP function
- Trip indication on the front
- Temperature compensation
- Ambient air temperature – operation: -25°C to +70°C
- All terminal screws are accessible from the front
- EF range: Sealable cover for operating elements
The electronic overload has better sensitivity than a standard thermal overload. Use the additional auxiliary contacts to notify the operator that the starter has tripped from a jam condition.
Case #2 Dodge MTA with ABB PSTX SS
Replace the existing starter with an ABB PSTX soft-starter.
The PSTX combines many years of research and product development with extensive knowledge of application specific requirements and needs. The PSTX is our latest advancement in motor control and protection and adds new functionality and increased reliability to any motor starting application.
- Secure motor reliability
- Improve installation efficiency
- Increase application productivity
- Main features
- ·Three-phase controlled
- Operational voltage: 208-690 V AC
- Wide rated control supply voltage: 100-250 V, 50/60 Hz
- Rated operational current: 30 to 1250 A (inside delta: 2160 A)
- Coated circuit boards
- Torque control for excellent control of pumps.
Similar to the starter solution, the soft-starter does the same thing with several enhanced benefits. The main benefit is the reduced torsion and stress on the MTA. This decrease extends the mean time before failure rate. The current can be limited, and include advanced torque stopping conditions not available with standard across the line starter designs. http://new.abb.com/low-voltage/products/softstarters/pstx
Case #3 Dodge MTA with ACS880 VFD
The ABB ACS880 is a combination of all the other solutions with even more beneficial features. With the ACS880 single drives, you simplify your world and open all possibilities. You have complete flexibility and capability in wall-mounted or cabinet-built drives. Drives can be customized to your precise needs in industries such as oil and gas, mining, metals, chemicals, cement, power plants, material handling, pulp and paper, sawmills and marine. Built on ABB’s common drive platform for precision control in a wide range of applications, such as cranes, extruders, winches, winders, conveyors, mixers, compressors, pumps and fans. http://new.abb.com/drives/low-voltage-ac/industrial-drives/acs880-single-drives
- Intuitive control panel and PC tool
- Direct torque control (DTC) for precise open and closed loop control
- Built-in safety features for simplified configuration
- Communication with all major automation networks
- Removable memory unit for easy drive commissioning and replacement
- Energy optimizer and energy efficiency information for monitoring and saving energy
- Designed for easy service
The drive is current limited and has the capability of reduced torsion ramps for start and stop. The drive allows for viable speed control unlike a soft-starter or across the line starter solution. The energy savings is the hidden benefit. If the speed is reduced below base speed, then the HP (energy consumption) is less. The drive also allows for a nearly unity power factor.
Let us help determine how this will work in your specific application. firstname.lastname@example.org
C. Tolbert DOE