Eltorque QT Series User Manual

Failsafe Option
Page 66 of 86
User Manual QT250 and QT800, ID 2021 2.0 July 2018
Table 20: Terms and abbreviations
Term
Description
Fail
Power-loss and/or signal loss. Detection of fail initiates failsafe procedure
Failsafe
actuator
An actuator that performs a pre-programmed failsafe procedure when fail is
detected
Failsafe
procedure
When a fail is detected, the failsafe actuator performs a procedure, depending on
the configuration and setup:
− Fail-to-close
− Fail-to-open
− Fail-maintain
Fail-maintain
Keep position when fail is detected
Fail-to-close
Move to closed when fail is detected
Fail-to-open
Move to opened when fail is detected
IAS
Integrated automation system
Power-loss
Power supply is insufficient to supply required power to actuator operating
interface
Signal-loss
Physical damage on signal wire(s). Detectable in actuator operating Interface as
signal loss
SOC
State of charge
SOH
State of health
UPS
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. The
main difference is that an UPS (battery and UPS management system) has been
added. With this added feature, it is possible to have the actuator go to a
predefined position in case of signal or power interruption. The focus in this
chapter is on these new components and the associated functionality changes
these components introduce to the actuator.
Note! The failsafe actuator is only available for the CANopen protocol.
The embedded failsafe actuator supports the following failsafe procedures:
• Fail-maintain: The actuator immediately stops and keeps the position. The
self-lock device supports this procedure.
• Fail-to-open: The actuator moves to the valve open position.

Eltorque QT Series Specifications

General

Brand	Eltorque
Model	QT Series
Category	Controller
Language	English