The Power Protection Blog

Kehua Tech, the international branch of Zhanzhou Kehua UPS in Xiamen, China has redesigned it’s range of 3, 5 & 6KVA online double conversion rackmount Uninterruptible Power Supplies (UPS). Gone are the hardwired outputs replaced with 16A and 10A IEC outlets for connection of rack PDU’s and direct connection to equipment. In addition to the RS232 interface a new USB port has been added for ease of connectivity with modern computer systems that may not have DB9 ports.

A new Emergency Power Off (EPO) port has been added to ensure that should an emergency occur the UPS can be made dead in an instant and not continue to provide power to the load in case of emergency.

These systems are designed with runtime in mind and so they require external battery cabinets that provide 38 minutes full load runtime on the 3KVA and 20 minutes on the 6KVA. Additional cabinets can be added as required extending autonomy into the hours should this be necessary. What’s more – unlike similar systems that boast long runtime capability, these systems come with a 4Amp charger as standard (rather than the normal 1A charger in most comparable systems) ensuring that your batteries are charged expediently following an outage.

For integration with standard data centre environments, the cooling fan takes cool air from the front and exhausts this from the rear, ensuring that the UPS will meet with any hot aisle/cold aisle configuration.

The full system is rack mountable, or free standing should you require. Occupying no more than 5U of rack space, the KR-J-F series is the latest on the highly competitive Kehua Tech range of UPS. Available exclusively through Power Inspired Ltd.

KR6000-J-F 6KVA Online Double Conversion UPS

What is a redundant power solution? Well it’s one where you have more UPS than you actually need to power the load. Typically referred to as an ‘n+1′ redundant solution, where ‘n’ is the number of systems you ordinarily require.

It’s achieved in the main with UPS systems that communicate with each other and effectively share the load. Such systems are usually in the high power three phase category. It is unusual to find any systems at low power ratings that can do this. What’s more, you will need a special output distribution circuit to be able to accommodate this.

For the small business owner, whose dependence on IT is no less valid than major data centre operators this leads to a dilemma, as he needs critical load power protection, but doesn’t have the infrastructure or budget to put in a fully configured n+1 solution.

The answer – the KTS redundant switch from Kehua. This is a rackmounted device occupying no more than 1U of height. It accepts two inputs and provides a single power output that is provided from a primary source. If the primary source should fail, the system will automatically transition to the secondary source within 4 mseconds which is fast enough not to be noticed by any computer type loads.

The primary source should be an online UPS system, and the secondary source can either be another UPS (for full protection) or fed from the mains so you can cover in case anything untoward should happen to the UPS. Of course, there is still the single point of failure on the KTS, but built with reliability in mind it has extremely high MTBF to ensure peace of mind.

Coupled with a KR1000J online double conversion 2U rack mount UPS, you can have a redundant solution for under £350, protecting up to 4 servers and occupying only 3U of rack space. Available in 2KVA, 3KVA and 6KVA modules the KTS redundant switch is an ideal method of achieving redundancy without breaking the bank.

KTS Redundancy Switch Available in 10A, 16A and 32A versions