Emerson E300 Series - Page 250

Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
User Menu A Commissioning
Advanced
Parameters
Diagnostics Optimization CT MODBUS RTU Technical Data
250 E300 Design Guide
Issue Number: 1
resistor.
Braking Resistor Thermal Time Constant (D16) = ≥ = E / P
The braking resistor is protected with a single time constant model as shown below:
The drive monitors the power flowing into the braking resistor and updates the Braking Resistor Thermal Accumulator (D17). If bit 1 of Action On Trip
Detection (H45) = 0 and the accumulator reaches 100 % a Brake R Too Hot trip is initiated. If bit 1 of Action On Trip Detection (H45) = 1 and the
accumulator reaches 100 % the braking IGBT is disabled until the accumulator falls below 95.0 %.
See Braking Resistor Rated Power (D15).
See Braking Resistor Rated Power (D15).
See Braking Resistor Rated Power (D15).
D16 Braking Resistor Thermal Time Constant
Mode Open Loop, RFC-A, RFC-S
Minimum 0.000 Maximum 1500.000
Default 0.000 Units %
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 3
Coding RW
D17 Braking Resistor Thermal Accumulator
Mode Open Loop, RFC-A, RFC-S
Minimum 0.0 Maximum 100.0
Default Units %
Type 16 Bit Volatile Update Rate Background Write
Display Format Standard Decimal Places 1
Coding RO, ND, NC, PT
D18 Braking Resistor Resistance
Mode Open Loop, RFC-A, RFC-S
Minimum 0.00 Maximum 10000.00
Default 0.00 Units Ω
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 2
Coding RW
D19 Braking IGBT Lower Threshold
Mode Open Loop, RFC-A, RFC-S
Minimum -VM_DC_VOLTAGE_SET Maximum VM_DC_VOLTAGE_SET
Default See exceptions below Units V
Type 16 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 0
Coding RW, VM
1 – e
-t/ τ
100%
Braking Resistor Rated Power (
D15 )
D
17
Braking Resistor
Thermal
Accumulator
Power into
braking
resistor
Braking resistor protection system