Emerson E300 Series - Page 205

Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
User Menu A Commissioning
Advanced
Parameters
Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 205
Issue Number: 1
Open-Loop
See Open Loop Control Mode (B09).
RFC-A
During auto-tune test 2 the drive uses the Open-loop mode control strategy with fixed voltage boost. Low Frequency Voltage Boost (B12) is used to
define the level of low voltage boost used during the test. See Open Loop Control Mode (B09) in Open-loop mode for more details.
Maximum Switching Frequency (B13) should be set to the required PWM switching frequency. The drive inverter will operate at this frequency unless
the inverter temperature becomes too hot. Under these conditions the drive will reduce the switching frequency in an attempt to avoid tripping. The
switching frequency has a direct effect on the sample rate for the current controllers (see Current Controller Kp Gain, Final Current Loop Kp (J29)). All
other control tasks are at a fixed rate.
Minimum Switching Frequency (B14) defines the minimum switching frequency that the system will attempt to use. If the switching frequency needs
to switch to a lower level, then the drive will trip. If Minimum Switching Frequency is changed the new value will only become active when Switching
Frequency is at or above the minimum value
B13 Maximum Switching Frequency
Mode Open-Loop, RFC-A, RFSC-S
Minimum 0 Maximum VM_SWITCHING_FREQUENCY
Default 4 Units kHz
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, TE, VM, RA
Value Text
02
13
24
36
48
512
616
Task
Speed controller (RFC-A, RFC-S) 250 μs
DC link voltage controller 1 ms
Flux controller (RFC-A, RFC-S) 1 ms
B14 Minimum Switching Frequency
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum VM_MIN_SWITCHING_FREQUENCY
Default 1 Units kHz
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, TE, VM
Value Text
02
13
24
36
48
512
616