Watson-Marlow MM440 - Manual (Page 217)

Issue 10/06 3 Functions
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0 217
NOTE
¾
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: The line supply voltage does not match the application situation.
Remedy: Refer to parameters P1254 and P0210.
¾ 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: Line supply voltage P0210 or ramp-down time P1121 too low
The moment of inertia of the driven load is too high
Remedy: Refer to parameters P1254, P0210, P1121
Use a braking resistor
¾ The Vdc_max switch-in threshold V
DC_max
depends on P1254
V
DC_max
(P1254 = 0)
≠
V
DC_max
(P1254
≠
0)
a) Auto-detect function enabled (P1254 = 1):
- V
DC_max
(P1254 = 1) is automatically calculated when the drive inverter
runs-up, i.e. after the line supply voltage has been connected
- Using the auto-detect function, the V
DC-Comp
threshold automatically
adapts itself to the line supply voltage at the particular installation
location.
b) Auto-detect function disabled (P1254 = 0):
- 0210 P 2 15 . 1 U
max _ DC
⋅ ⋅ =
- The V
DC-Comp
threshold is immediately re-calculated after entering P0210
- P0210 must be adapted to the particular installation location.