in the selection and application of Automatic Transfer Switches
|
Feature
|
Reasoning
|
| Single Operator | Provides inherent double-throw operation. The same operator opens one set of contacts while closing the other set. Ensures positive locking and high contact pressure. |
| Solenoid Operator Design | Simple, proven operator. Less moving parts result in higher reliability. Repeatably fast operation. |
| Same Operator 30-4000 amp, ATS, CTS and DTS | Provides uniformity of design across entire product line and simplifies maintenance for owner. |
| Non-fused Operator | A transfer switch is an emergency device. A fused device intentionally renders the switch inoperable is undesirable and defeats the purpose of a transfer switch. |
| Contacts designed and manufactured specifically for transfer switch duty | Silver alloy main contacts (highly conductive) and arcing contacts (resistant to heat) designed for specific purpose. |
| Contacts designed by ATS manufacturer | Does not use components or parts designed for other electrical applications and not dependent other component manufacturer for supply. |
| 3 Cycle (long time) WCR Ratings and Short time ratings on switches 600 amps and above | Provides UL listing with "any breaker." Allows consultant to specify switch without regard to CB manufacturer. |
| Low current arc quenching capabilities | Wide arc gaps assure arc is quenched even at low current levels, eliminating "lazy arc." |
| Easy to inspect, maintain and replace contacts and coils | Simplifies inspection and maintenance. Ensures minimum downtime on essential and critical loads. |
| Segmented contacts on switches 600 amps and larger | Assures adequate contact surface and pressure through multiple, spring-loaded contacts. |
| Manufacturers complete line 30-4000 amp | Coordinated design; Engineering, design, manufacturing, and service responsibility under control of one manufacturer. |
| Global service support | Global service centers are staffed and equipped for deployment 7 x 24 x 365. Service vans are stocked with parts and not dependant upon supply from other manufacturers. |
| Repeatably fast transfer operation | Allows use of in-phase and closed transition transfer; restores power to critical loads quickly; avoids drop-out of motor starters on hot-to-hot transfer. |
| Overlapping Neutral | Provides isolation of neutral for proper ground fault detection; eliminates voltage transients caused by neutral interruption; eliminates arcing damage on neutral contact; Overlapping neutral pole is fully rated for continuous and WCR currents |
| Service Handle | Allows slow switch operation for maintenance and adjustment. |
| Optional External Load-Break UL Approved QMQB Operator | Provides safe manual operation under load (without opening door). |
|
Feature
|
Reasoning
|
| Plug / Harness Design | Safety and ease of trouble-shooting |
| Standard microprocessor control panel with LC Display | State of the art technology; Integrated features ensure proper operation under all conditions. |
| Frequency sensing on emergency, standard | Protects against bogging down generator which has not come up to speed. |
| Touch pad programming for features and settings | Provides accurate field adjustability of time delays and voltage settings, without the use of special tools, meters, or power supplies. |
| Surge and transient protection Compliance with (EN 55011:1991), (EN 50082-2:1995), (EN 61000-4-2:1995), (ENV 50140:1993), (EN 61000-4-4:1995), (EN 61000-4-5:1995), (EN 61000-4-6:1996), (EN 61000-4-11:1994) | Protects against spurious electromagnetic pulses or electrical transients on power or serial lines. |
| Event log with statistical and diagnostic screens | Event log displays up to 99 events. Assists in troubleshooting and testing. |
| Automatic engine exerciser | Standard load/no load exerciser timer with seven independant programmable test schedules |
| In-phase monitor, built-in, standard | Eliminates excessive motor inrush, without the need for a neutral, or "off" position. |
| Serial communications capability with plug-in card | Provides owner with the ability to control and monitor ATSs form a local area network or through the internet from anywhere in the world. |
|
Feature
|
Reasoning
|
| No Load Break Bypass | Provides ability to test and maintain without disturbing load; eliminates need for load disconnect contact. |
| Bypass and Isolate without opening door | Allows safe operation. |
| Permanently mounted bypass handle | Eliminates need for locating "loose" handle and inserting into opening. |
| Easily operated bypass handle | Allows operation with one hand, without need of excessive force. |
| Bypass switch accessible | Allows inspection of bypass contacts. |
| Available through 4000 Amp | Insures uniform design concept by one manufacturer over entire range. |
| Silver-plated copper bus | Most conductive; ensures minimum heating. |
| Mechanical and electrical position indicators for bypass and transfer switch | Provides user with clear indication of bypass and transfer switch status. |
|
Feature
|
Reasoning
|
| Closed Transition Transfer (CTTS) | Allows transfer of load between acceptable power sources without interruption of power to the load. |
| 0.2 Hz Window | Allows transfer to occur at wider frequency difference between sources. |
| Default to Inphase Operation | Separate inphase monitor ensures transfer of motor load will occur without excessive inrush currents even in open transition mode; alternate method requires less reliable "off" position transfer. |
| Soft Loading Option | Allows ramping of load to generator and control operation using graphical user interface with user friendly pull-down menus. CTTS can be field upgraded for soft load operation. |
|
Feature
|
Reasoning
|
| ISO 9001 | Ensures quality level; Provides recognition as Global Manufacturer |
| ASI / Factory Trained Service | Provides timely, knowledgeable field service; Ability to furnish maintenance contracts. |
| Proven Field Record Over 70 Years | Stable and dependable company to provide 7x24 field service from over 120 ASI service personnel and over 500 Emerson associates. |
|
Florham Park, NJ 07932 |
|||