Parameter settings 53
Notes
ACS880-07/17/37 drives with the option +Q978
In motor overtemperature situations, the FSO module also opens the main contactor/
circuit breaker.
ACS880-07/17/37 drives with the option +Q978 or +Q979
The FSO module is configured so that after the safety function activation, the user must
reset the FSO module manually with the emergency stop reset button. In this case, the
user must reset the FSO module with the emergency stop reset button also after motor
overtemperature situations. Also the indication lamp on the reset button is illuminated. Do
not change the setting.
Mechanical brake control
If you use a mechanical brake with the motor thermal protection circuit, pay special
attention to the control of the mechanical brake.
If the motor deceleration by the mechanical brake causes extra heat generation in the
ATEX area, make sure that the use of the brake does not rise the temperature excessively.
In this case, make sure that the mechanical brake is activated only at the zero speed (see
parameters SBC.11 STO SBC usage, SBC.15 SSE/SS1 SBC speed and FSOGEN.51 or
FSOGEN.52).
In some cases you cannot use the brake for the motor deceleration when the motor
thermal protection circuit has tripped, and the motor temperature is excessive already.
For more information, see the drive firmware manual (or the FSO user’s manual if you use
the Safe brake control (SBC) function of the FSO module).
92.10 Pulses/revolution 2048 Sets the number of HTL pulses per revolution for safety
pulse encoder 1.
Adjust the default value to meet the safety pulse encoder in
use. Make sure that the value is according to the encoder
nameplate.
92.17 Accepted pulse
freq of encoder 1
300 kHz Sets the maximum pulse frequency range of encoder 1.
Adjust the default value to meet the motor and safety pulse
encoder in use. You can use this formula to define the value:
r_max x ppr_enc + 10%, where
• r_max = the maximum motor speed (rpm) used in the
application
(or the motor nominal speed)
• ppr_enc = Pulses/revolution of the safety pulse encoder
(parameter 92.10).
Index Name Example
value
Description
00 ACS880 ATEX cabinet.book Page 53 Tuesday, May 28, 2019 10:25 AM
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General