Invertek OPTIDRIVE Coolvert - Page 19

Version 1.00 | Optidrive CoolVert User Guide | 19www.invertekdrives.com
3
Installation
“STO” Operation
When the “STO” inputs are energised, the “STO” function is in a standby state, if the drive is then given a “Start signal/command” (as
per the start source method selected in P1-11) then the drive will start and operate normally.
When the “STO” inputs are de-energised then the STO Function is activated and stops the drive (Motor will coast), the drive is now in
“Safe Torque Off” mode.
To get the drive out of “Safe Torque Off” mode then any “Fault messages” need to be reset and the drive “STO” input needs to be
re-energised.
“STO” Status and Monitoring
There are a number of methods for monitoring the status of the “STO” input, these are detailed below:
 Optional Remote Keypad
In Normal drive operation (Mains AC power applied), when the drives “STO” input is de-energised (“STO” Function activated) the
drive will highlight this by displaying “InHibit” on the remote keypad and bit 5 of the status word will become active.
NOTE If the drive is in a tripped condition then the relevant trip will be displayed on the remote keypad and not “InHibit”.
 Drive Output Relay
Drive relay 1: Setting P3-05 to a value of “5” will result in relay opening when the “STO” function is activated.
“STO” Fault Code
Fault Code Code Number Description Corrective Action
“Sto-F” 29
A fault has been detected within either of the
internal channels of the “STO” circuit.
Refer to your Invertek Sales
Partner
“STO” Function Response Time
The total response time is the time from a safety related event occurring to the components (sum of) within the system responding and
becoming safe. (Stop Category 0 in accordance with IEC 60204-1).
  The response time from the “STO” inputs being de-energised to the output of the drive being in a state that will not produce torque
in the motor (“STO” active) is less than 1ms.
  The response time from the “STO” inputs being de-energised to the “STO” monitoring status changing state is less than 20ms.
  The response time from the drive sensing a fault in the STO circuit to the drive displaying the fault on the display/Digital output
showing drive not healthy is less than 20ms.
“STO” Electrical Installation
The “STO” wiring shall be protected from inadvertent short circuits or tampering which could lead to failure of the “STO”
input signal, further guidance is given in the diagrams below.
In addition to the wiring guidelines for the “STO” circuit below, section 3.3. EMC Compliant Installation on page 14 should also
be followed. The drive should be wired as illustrated below; the 24Vdc signal source applied to the “STO” input can be either from the
24V dc on the drive or from an External 24V dc power supply.