Implementing a Safe disconnection function 15
Parameter settings
ACS850 standard control program
Note: A manual reset is mandatory in an ATEX compliant safety functions. After the relay
has detected a motor overtemperature, the drive must not restart before a manual reset
command. This can be implemented either by a manual reset of the ATEX compliant relay
with the motor overtemperature indication of ACS850 standard control program (indication
to be set as Fault), or by setting the drive parameter 30.07 into Fault in ACS850 standard
control program.
Select the STO indication for the drive with parameter 30.07 Sto diagnostic. In this
example, Fault is required if the 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 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 switched off. 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.
Configuring a motor overtemperature indication message
Note: The control program of the drive has two separate temperature monitoring
functions. In this example, one of these functions is configured to monitor digital input DI6.
To configure a motor overtemperature indication message on the drive control panel
display, do the following steps:
1. Connect XD24:1 (+24 V DC) through one normally-open contact of the thermistor
relay to digital input DI6 on the drive control unit.
2. Set parameter 31.02 Mot temp1 src to (4) PTC JCU.
3. Set parameter 31.01 Mot temp1 prot either to (1) Alarm or (2) Fault depending on the
preferred indication.
Ensure that the thermistor relay, parameter 31.01 or parameter 30.07 lead to a fault which
requires a manual reset action.
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 14 and General wiring instructions on page 18.
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