Siemens MICROMASTER 440 Operating Instructions Manual page 217

Issue 10/06
NOTE
If the DC link voltage exceeds the power-on threshold r1242 (switch-on level of
Vdc_max.) of the Vdc_max controller in the "Ready" state, then the Vdc_max
controller is de-activated and warning A0910 is output.
Cause:
Remedy:
If, in the "Run" state, the DC link voltage exceeds the power-on threshold r1242
and if the Vdc_max controller output is limited by parameter P1253 for approx.
200 ms, then the Vdc_max controller is de-activated and warning A0910 and,
where relevant, fault F0002 are output.
Cause:
Remedy:
The Vdc_max switch-in threshold V
V
DC_max
a) Auto-detect function enabled (P1254 = 1):
-
-
b) Auto-detect function disabled (P1254 = 0):
-
-
-
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
The line supply voltage does not match the application situation.
Refer to parameters P1254 and P0210.
Line supply voltage P0210 or ramp-down time P1121 too low
The moment of inertia of the driven load is too high
Refer to parameters P1254, P0210, P1121
Use a braking resistor
≠
(P1254 = 0) V
DC_max
V (P1254 = 1) is automatically calculated when the drive inverter
DC_max
runs-up, i.e. after the line supply voltage has been connected
Using the auto-detect function, the V
adapts itself to the line supply voltage at the particular installation
location.
= ⋅ ⋅
U . 1 15 2 P 0210
DC _ max
The V threshold is immediately re-calculated after entering P0210
DC-Comp
P0210 must be adapted to the particular installation location.
depends on P1254
DC_max
≠
(P1254 0)
threshold automatically
DC-Comp
3 Functions
217