ABB ACS850 Series Application Manual

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Contents

ABB ACS850 Series Application Manual Manual pdf 13 page image

Implementing a Safe disconnection function 13 Parameter settingsACS850 standard control programNote: A manual reset is mandatory in the temperature protection function, if it is requiredfor ensuring the compliance of the system with Ex/ATEX regulations. When the protectionrelay detects motor overtemperature, the drive must not restart before a manual resetcommand. You can implement a manual reset in the ATEX-compliant protection relay(recommended) or by setting the drive parameter 30.07 into Fault.Select the STO indication mode for the drive with parameter 30.07 Sto diagnostic. In thisexample, Fault is required if the manual reset is implemented with the parameter 30.07 Stodiagnostic. The control panel display shows fault message 0031 SAFE TORQUE OFFwhen one or both STO inputs are activated (switched off) (0) or lost. If the drive control unitis externally powered, but no main power is connected to the drive, the fault messageshows 0021 STO1 LOST (for XSTO connection 1 - 3 and 0022 STO2 LOST (for XSTOconnection 2 -4). With the setting Fault the indication is the same independent on whetherthe drive is running or stopped when the STO input is activated. The drive can be restartedafter resetting the fault.If you implement the manual reset in the relay, the parameter 30.07 can be set to anyvalue. Switching frequency limitationThe certificate of the Ex motor typically requires that you set a minimum limit for theswitching frequency of the drive.For ABB Ex motors with ACS850 drives, set the minimum switching frequency to 3 kHz forboth DTC motor control mode and scalar motor control mode. For more instructions,contact your ABB representative. Wiring instructionsSee sections Connection diagram on page 12 and General wiring instructions on page 18.One-channel connection to drive STO terminals GeneralThis section represents the implementation of an ATEX-compliant thermal motorprotection circuit:• The circuit uses the ATEX-certified Safe disconnection function (option +Q971) of thedrive.• There is a one-channel (non-redundant) connection from the temperature protectionrelay to the drive STO terminals. Both STO inputs of the drive are connected to sameoutput contact of the protection relay.• One output contact of the protection relay is connected to a digital input of the drive.• The drive control panel shows an overtemperature indication when the digital inputswitches off (the protection relay trips)If you plan to use the one-channel (non-redundant) connection, make sure that you canreach the necessary safety integrity level. According to the standard EN 50495, SIL1 issufficient for the protection of category 2 and 3 equipment.Note: The STO function of the drive must always have redundant connection. SeeConnection diagram on page 14.