Emerson Mentor MP, Руководство для продвинутых пользователей

Страница: 71 / 222

Menu 4
Parameter
Parameter description
protocol
Performance
This parameter is set to correct any errors in the prediction of firing angle in the discontinuous current region.
When enabled an additional safety margin of 1 supply cycle is added to the bridge changeover logic. This may be required for highly inductive loads,
There is hysteresis on bridge change over to prevent oscillation between the two bridges under lightly loaded conditions. In applications which require
structure
Keypad and
format
Advanced parameter
descriptions
Serial comms
Pr 4.34 = 1131 x R x Imax / V rms
Where :
L is the load inductance in Henries
R is the load resistance in ohms
f is the supply frequency in Hertz
Imax is the peak load current (including any overload) in amps
V rms is the line-to-line supply voltage in volts.
such as a motor field.
fine control of the current the bridge change over hysteresis can be reduced from 1.6 % to 0.2 % of the drive maximum current by setting this
parameter.
68
Mentor MP Advanced User Guide
www.onxcontrol.com Issue Number: 4
4.34 Discontinuous current controller Ki gain
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1 1
Range 0 to 4000
Default 200
Second motor
parameter
Pr 21.12
Update rate Background read
4.35 Extra safe bridge change
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1
Default 0
Update rate Background read
4.36 Reduced hysteresis for bridge change over
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 1 1
Default 0
Update rate Background read