ABB ACS850 series User Manual

Implementing a Safe disconnection function 13
 Parameter settings
ACS850 standard control program
Note: A manual reset is mandatory in the temperature protection function, if it is required
for ensuring the compliance of the system with Ex/ATEX regulations. When the protection
relay detects motor overtemperature, the drive must not restart before a manual reset
command. 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 this
example, Fault is required if the manual reset is implemented with the parameter 30.07 Sto
diagnostic. The control panel display shows fault message 0031 SAFE TORQUE OFF
when one or both STO inputs are activated (switched off) (0) or lost. If the drive control unit
is externally powered, but no main power is connected to the drive, the fault message
shows 0021 STO1 LOST (for XSTO connection 1 - 3 and 0022 STO2 LOST (for XSTO
connection 2 -4). With the setting Fault the indication is the same independent on whether
the drive is running or stopped when the STO input is activated. The drive can be restarted
after resetting the fault.
If you implement the manual reset in the relay, the parameter 30.07 can be set to any
value.
 Switching frequency limitation
The certificate of the Ex motor typically requires that you set a minimum limit for the
switching frequency of the drive.
For ABB Ex motors with ACS850 drives, set the minimum switching frequency to 3 kHz for
both DTC motor control mode and scalar motor control mode. For more instructions,
contact your ABB representative.
 Wiring instructions
See sections Connection diagram on page 12 and General wiring instructions on page 18.
One-channel connection to drive STO terminals
 General
This section represents the implementation of an ATEX-compliant thermal motor
protection circuit:
• The circuit uses the ATEX-certified Safe disconnection function (option +Q971) of the
drive.
• There is a one-channel (non-redundant) connection from the temperature protection
relay to the drive STO terminals. Both STO inputs of the drive are connected to same
output 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 input
switches off (the protection relay trips)
If you plan to use the one-channel (non-redundant) connection, make sure that you can
reach the necessary safety integrity level. According to the standard EN 50495, SIL1 is
sufficient for the protection of category 2 and 3 equipment.
Note: The STO function of the drive must always have redundant connection. See
Connection diagram on page 14.

ABB ACS850 series Specifications

General

Brand	ABB
Model	ACS850 series
Category	Control Unit
Language	English