Invertek Drives elevator CORE Quick Start-Up Manual page 50

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19.1.4. "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 P1-02) 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.
The STO inputs are positive logic inputs only and are therefore not affected by the setting of parameter P1-43 (Positive/negative logic select).
19.1.5. "STO" Status and Monitoring
There are several methods for monitoring the status of the "STO" input, these are detailed below:
Drive Display
In Normal drive operation (Mains AC power, UPS Power or Battery Power), when the drives "STO" input is de-energised ("STO" Function
activated) the drive will highlight this by displaying " n ibit".
Note: If the drive is in a tripped condition then the relevant trip will be displayed and not "InHibit").
Drive Status parameter
Parameter P0-03 can be viewed to see the STO input status as illustrated below :
Display value
Input Terminal
1 = Input Active
0 = Input InActive
Drive Output Relay and Digital Outputs
Relay 1 or the digital outputs can be used to monitor the status of the STO inputs by setting the function to 8.
For Relay 1 set P1-30 to 8.
For Digital Output 1 (DA1) set P1-15 to 8 and P1-14 to 0
For Digital Output 2 (DA2) set P1-22 to 8 and P1-21 to 0
For Digital Output 3 (DO3) set P1-28 to 8.
"STO" Fault Codes
Fault Code
Code Number

29

101
19.1.6. "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 20ms.
•
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.
A fault has been detected within either of the internal channels of the
"STO" circuit.
STO1/STO2 signals removed whilst drive running
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
STO1
Description

STO2
Corrective Action
Refer to your Invertek Sales
Partner
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