Siemens SINAMICS G120XA - Page 328

4. Set the source to select the direction of rotation.
– p3881 = 0, 1, 2, 3:
When you interconnect p3883 with a free digital input of your choice, p3883 inverts the
direction of rotation during essential service mode.
For example, to interconnect p3883 with DI 4, set p3883 = 722.4.
– p3881 = 4:
The technology setpoint direction of rotation is valid.
5. Optional switching to bypass mode
If the converter is not able to acknowledge pending faults with automatic restart, it signals
fault F07320 and does not make any other attempts to restart.
If the motor still continues to operate in this case, you must set the following:
– Set p1266 = 3889.10. The converter switches the motor to bypass mode with
r3889.10 = 1.
– Ensure that the direction of rotation does not change when switching over to bypass
operation.
– Set p1267.0 = 1. The converter switches the motor to bypass mode independent of the
speed with control signal p1266.
– Commission the "Bypass" function.
Bypass (Page 332)
You have commissioned the essential service mode.
❒
Example
To improve the air circulation in the stairwells, the ventilation control creates an underpressure
in the building. With this control, a fire would mean that flue gases enter into the stairwell. This
would then mean that the stairs would be blocked as escape or evacuation route.
Using the essential service mode function, the ventilation switches over to the control of an
overpressure. The essential service mode prevents the propagation of flue gas in the stairwell,
thereby keeping the stairs free as an evacuation route as long as possible.
An application example for the essential service mode can be found on the Internet:
http://support.automation.siemens.com/WW/view/en/63969509 (http://
support.automation.siemens.com/WW/view/en/63969509)
Parameters
Parameter Description Factory setting
p1206[0…9] Automatic restart faults not active 0
p1210 Automatic restart mode 0
p1211 Automatic restart, start attempts 3
p1212 Automatic restart, wait time start attempts 1 s
p1213 Automatic restart monitoring time for restart 60 s
p1213 Automatic restart reset monitoring time for start counter 0 s
p1266 BI: Bypass control command 0
Advanced commissioning
6.8 Drive availability
SINAMICS G120XA converter
326 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB