The Eltorque QT250 and QT800 actuators are available with more than one
safety/emergency solution.
The standard product comes with:
• An emergency hand wheel for manual operation
• A self-lock function that ensures that the actuator is kept in position.
Additionally, the following options are available:
• A Dual CAN option, providing a more robust CAN network.
• A Failsafe option, providing and UPS back-up battery.
This appendix describes the Dual CAN option. The Failsafe option is described in
0 on page 64.
Note! It is not possible to upgrade an already installed standard actuator with Failsafe
or Dual CAN options. This must be included when ordering.
Table 18: Terms and abbreviations
Each unit acts as a repeater and writes and reads on both CAN modules. One
special feature of the Dual CAN is that it separates a defective unit/segment from
the rest of the ring so that the remaining network can continue working as
normal.
With the Dual CAN option, redundancy support is improved, which makes the
actuator system more robust to errors.
A small hardware modification in the CAN interface improves the redundancy
support and makes a loop of actuators more robust to short circuits in the cable.
The actuators can be connected in a bus topography like before, but the Dual
CAN interface also enables a ring topography. This allows a redundant PLC to be
connected at the other end, which in turn makes it possible to retain full control
of all actuators in the event of a signal cable failure (short circuit, breakage etc.).
In previous CAN interfaces, which the Dual CAN is based on, signals pass
through the node directly. A signal cable failure between any two nodes here
would take down the whole loop. However, by introducing the Eltorque Dual
CAN, the nodes may instead isolate a signal cable failure and continue to
operate.
The Dual CAN function is an add-on feature to the following actuators:
• QT250/800 2.5 CANopen Actuator
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