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Diagnostics Optimization CT MODBUS RTU Technical Data
206 E300 Design Guide
Issue Number: 1
The switching frequency is changed in steps defined by Switching Frequency Step Size (B15). For example with a switching frequency of 16 kHz and
a step size of two, the frequency will be reduced to 8 kHz, then 4 kHz, etc.
Symmetrical Current Limit (B16) limits the current when the motor is being accelerated away from standstill and when the motor is being decelerated
towards standstill. The maximum possible current limit (VM_MOTOR1_CURRENT_LIMIT [MAX]) varies between drive sizes with default parameters
loaded. For some drive sizes the default value may be reduced below the value given by the parameter range limiting.
The current limit can be further limited by motor overload protection and/or drive temperature monitoring to give final current limit (J21).
If Percentage Over Current Trip Level (B17) is left at its default value of 100 % an over-current trip due to currents flowing between the output phases
will occur at a level approximately equal to the current defined by Drive Full Scale Current Kc (J06). Note that this current is defined as an r.m.s.
value, but the over-current trip activates if one of the phase currents exceeds the equivalent peak of a sine wave with the defined r.m.s. level.
Permanent magnet motors are de-magnetized if the current in the motor exceeds a specified level. If this level is less than the peak of a sine wave
with an r.m.s. value defined by Drive Full Scale Current Kc (J06) then Percentage Over Current Trip Level (B17) should be modified to reduce the
over-current trip. Percentage Over Current Trip Level (B17) gives the percentage of Drive Full Scale Current Kc (J06) used to define the over-current
trip level.
B15 Switching Frequency Step Size
Mode Open-Loop, RFC-A, RFC-S
Minimum 1 Maximum 2
Default 2 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
B16 Symmetrical Current Limit
Mode RFC-S
Minimum −VM_MOTOR1_CURRENT_LIMIT Maximum VM_MOTOR1_CURRENT_LIMIT
Default
Open loop: 165.0%, RFC-A, RFC-S
175.0%
Units %
Type 16 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 1
Coding RW, VM, RA
B17 Percentage Over Current Trip Level
Mode RFC-S
Minimum 0 Maximum 9
Default 9 Units %
Type 8 Bit User Save Update Rate Percentage Over-current Trip Level
Display Format Standard Decimal Places 0
Coding RW, TE
Value Text
010
120
230
340
450
560
670
780
890
9 100
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