Electric Fail-Safe Device Installation, Operation & Maintenance Manual, 3A
PRODUCT DESCRIPTION:
The Indelac Controls DC Electric Fail-Safe Device provides battery backup power to your actuator in the
unlikely event that the Factory or Facility Mains Power should go down. These devices are designed to
seamlessly supply 24vdc battery standby power to power your 24vdc actuator. The battery supplies an
internal Backup Module that supplies backup DC to run the actuator to the user wired Fail Position when
the Mains Power fails. When normal Mains Power is present, it powers the actuator and provides a
maintenance charge to the backup batteries. When the Mains Power fails or drops out momentarily, the
Backup Module will automatically switch over to battery power and supply a constant 24vdc to the actuator.
When the Mains Power comes back online, the Backup Module will immediately transfer Mains Power back
to the actuator and proceed to re-charge and maintain the batteries.
Indelac provides these DC Fail Safe Devices in NEMA 4, NEMA 4X or NEMA 7 enclosures to provide 10 or
30 Amps of output power. Each Fail-Safe Device is designed to supply the actuator’s continuous Full Load
Ampere draw to drive the Actuator to the Fail-Safe position. When selecting the Fail-Safe Device to back
up your actuator power, 10 Amps or 30 Amps is the MAXIMUM current output to the load. Therefore, the
Locked Rotor Amps or Start-Up Current of the Actuator needs to be figured into the maximum 10 Amps or
30 Amps output.
The Fail-Safe Device will float charge the on-board Sealed Lead Acid Batteries when Mains Power is ON.
Depending on the size & age of the batteries used in the Fail-Safe Device, battery charge time can vary
from hours to overnight for a full charge.
Optional features, such as Emergency Disconnect Switches, Internal Heaters and Internal Relays to run
more than 1 actuator to Fail Position may be ordered –Consult the Factory for available SPECIAL
Options.
24vdc 10 Amp NEMA 4X Version Shown
