User Manual QT250 and QT800 gen 2.5, ID 2021 2.3 20. April 2021
Table 20: Terms and abbreviations
A single failure causing power loss and/or signal loss. One or more failures are
detected, and the failsafe protocol is initiated (programmable time delay before
initiation).
An actuator that performs a pre-programmed failsafe procedure when a failure is
detected.
The security protocol initiated after an actuator failure to enter what has been
pre-set as the safest position.
The different failsafe protocols are described in section B.4.iii on page 71.
Integrated automation system
The power supply is below the critical level due to a power supply failure or a
cable failure.
The signal heart-beat is lost for “heart-beat bad timeout” due to controller failure
or cable failure.
State of charge (shows the current Stat of Charge for the internal battery).
State of health (shows the last tested State of Health for the internal battery).
Uninterruptible power supply.
All batteries and electronic equipment may contain substances harmful to the
environment. After removing used equipment, return them for disposal
according to local governmental guidelines.
The failsafe electrical actuator is based on the QT250 and QT800 model.
Physically the difference is the added failsafe module in-between the interface
box and the back plate also found on the standard version. This module contains
the battery (Lead acid) and the UPS management system.
When adding this module, the certified temperature rating is reduced and the
overall size is increased, but it enables the use of the internal power source for a
pre-defined operation after a signal or power-loss. Both these interruptions are
individually adjustable by a predefined time delay.
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