Safety Warnings And Limitations - Parker AC30P User's Product Manual

6-18
Safe Torque Off

Safety Warnings and Limitations

 Only competent personnel are permitted to install the STO function and commission it. They must disseminate and make available all
appropriate instructions and documentation to all personnel who may come into contact with or operate the STO and provide suitable
training on the inverter to ensure it is operated in the correct manner and to avoid damage, injury or loss of life.
 The inverter STO function is a factory-fitted and factory-tested feature. Repairs to the inver STO featured-product are to be carried out
only by Parker authorized repair centres. Any unauthorised attempt to repair or disassemble the product will render any warranty null and
void, and STO integrity could be impaired. PARKER WILL NOT ACCEPT ANY LIABILITY FOR FAILURE TO OBEY THESE
INSTRUCTIONS OR FOR ANY CONSEQUENTIAL INJURY, DEATH, LOSS OR DAMAGE.
 It is important that the inverter product environment including all aspects of its CE conformance and IP etc., specified elsewhere in this
manual, is maintained to ensure the safety integrity of the STO function.
 Should synchronous motors be operated in the field weakening range, operation of the STO function may lead to overspeed and
destructive overvoltages as well as explosions in the drive. Therefore, the STO function must NEVER be used with synchronous drives in
the field-weakening range. The user must ensure this condition is prevented.
 When using synchronous permanent magnet motors, shaft movement over a small angle is possible if two faults occur simultaneously in
the power section of the drive. This depends on the number of motor poles. The maximum angle is:
It is the user's responsibility to assess, validate and safeguard as necessary against this potential hazard.
 If external forces can act on the motor and/or load to cause it to move, additional measures must be taken by the user to restrain it, for
example a mechanical brake. Examples of external forces are suspended loads (effect of gravity), and other web-tensioning devices.
 The inverter STO feature does not provide or guarantee any galvanic isolation in accordance with EN 60204-1:2006 A1:2009 Section 5.5.
This means that the entire system must be isolated from the mains power supply with a suitable electrical isolation device before any
drive or motor maintenance or replacement procedures are attempted. Note that even after the power has been isolated, dangerous
electrical voltages may still be present in the inverter. Safe discharge times and details are specified in Chapter 1 Safety of this manual.
 The STO function must not be used for electrical isolation of the inverter and power. Whenever any personnel require to work on the
drive, associated motor or other power items, they must always use recognised and suitable electrical isolation devices.
 Terminal X10/02 or X10/04 must be connected to earth at one common point in the drive system. For multi-drive systems this can be a
shared earth point.
 The STO user output, serial communications or GKP messages relating to accessing or viewing any safety monitoring statuses are for
information only and should not be relied on. They are not part of the drive module safety system and its associated PL/SIL declared
ratings. Any customer use of these must be appropriately risk assessed in accordance with the relevant standards or regulations.
 The STO safety function must be tested regularly. The frequency should be determined by the machinery builder. An initial minimum
frequency of once per week is suggested. Refer to page 6-26 and following pages.
 When using an external safety control unit with adjustable time delay, for example when implementing an SS1 function, the time delay
must be protected to prevent unauthorized adjustment. The adjustable time delay on the safety control unit must be set to a value greater
Rotary motors: 360° / number of poles.
Linear motors: 180° electrically.
AC30 series Variable Speed Inverter