• • • UPS & STANDBY POWER • • • Summary:
Battery-assisted VRLA Hold-up time – minutes to hours Temperature range – 0 to +40°C Typ. life expectancy (at 40°C) – 2 years after battery replacement. Maximum storage time – recharge required every 6-9months (temp.-dependent). Ventilated control cabinets – required. Weight – heavy.
Storage and shipping condition – loaded.
Capacitor supported Electrochemical double- layer capacitor Hold-up time – 0 to 150 seconds. Temperature range – -40°C to +60°C. Typ. life expectancy (at 40°C) – >10 years. Maximum storage time – almost unlimited. Ventilated control cabinets – not required. Weight – light.
Storage and shipping condition – unloaded (without energy). application s
Which UPS system is suitable
for which application? The answer to the question of which UPS system is suitable for which application cannot be generalised. Each application is individual and, therefore, requires an individual analysis. This is the only way to ensure selection of the correct uninterruptible power supply. However, there are certain questions that can help to find the ideal backup application for a system:
• What output voltage is required? • How much power must be available as a backup?
• How much backup time is required?; and • Are there any loads in this application that do not require backup, and if so, how many?
This information can be used to prepare recommendations for the required output power of the power supply, as well as for the backup method and any additional equipment that may be required.
Examples:
UPS modules with batteries are suitable for applications that require a long buffer time in case of emergency:
PULS UB series UPS modules are often used in systems that must bridge a long gap until a service technician can fix the problem. This includes signal lights on radio masts or wind turbines, for example.
UPS modules with capacitors provide a short buffer time:
In regions with poor grids, PULS UF modules can bridge the failure of individual half-waves. However, they can also be used to supply an application that typically runs at 3A but sometimes also runs at 12A for short periods of time.
In the event of a power failure, the modules of the PULS UC series ensure that a system is switched off and shut down safely, including data backup. Additionally, machine arms or axes can be moved to a safe position.
PULS offers two capacitor buffer modules with different storage sizes designed for 24V systems and can be loaded with up to 15A in normal and buffer mode. Both units have a capacitor storage with built-in control electronics inside a compact, DIN rail mountable housing.
The series connection of the individual capacitors is equipped with an active “balancer circuit”, which benefits a long lifetime. For monitoring and diagnosis, the unit is equipped with signal contacts and display elements. If buffering is not desired, this can be inhibited with the inhibit input. For DC-UPS modules with batteries, PULS offer two solutions using different devices keeping the output voltage stable at the set value of the buffer voltage in case of buffering. Values from 22.5V to 26V can be set, regardless of the battery voltage. An alternative solution directly passes on the battery voltage at the output, minus a small voltage drop.
18 ELECTRICAL ENGINEERING • MARCH 2023
electricalengineeringmagazine.co.uk
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