Power source switchover
- Building Systems
- Facility Management
- When the voltage falls below 0.85 times the nominal voltage for longer than 0.5 seconds, the system must switch over from the normal power supply to the emergency power supply.
When the voltage exceeds 0.85 times the nominal voltage for at least one minute, the system may and should switch back to the normal power supply.
- The E3YF400VE20 0.85 has a fixed threshold of 0.85 the nominal voltage. If the mains voltage falls below this level, the monitoring relay sends the signal to switch to the emergency power supply.
The integrated time delay of one minute prevents the system from switching back and forth when the power supply fluctuates excessively over a longer period. One minute after the mains voltage returns to the normal level, the monitoring relay sends the signal to the system to switch back to mains voltage.
- - Both functions (monitoring and time delay) are combined in a single unit, which saves space
- Time savings during wiring, as only one device needs to be connected
May I help you?
Can't find what you're looking for? Please don't hesitate to contact me.
This might be of interest for you
No entries found.
Emergency power supply
It must be ensured that the emergency power system is switched on within 30 ms when the lighting power supply fails.
Sty ventilation system monitoring
The ventilation of a pigsty must be ensured. If the system fails, the animals could die.
Voltage dip detection
Very short voltage dips cause some components in a heating control system to fail, while others continue to function. This interrupts the control circuit, and…
Lift equipment service
A wide range of different control and supply voltages are used for conveyor and transport systems. The maintenance of expensive inventories of replacement parts…
Automatic fan control of drying chamber
The monitoring relais E3IF500mAAC20 controls automatic start/stop of auxiliary drives.
Monitoring emergency lighting system
An undervoltage monitoring relay with a fixed switching threshold at 0.85% of the nominal voltage is needed for emergency lighting systems. Two changeover…