Inverter Braking Systems - Brake Resistors and Overloads
Brake resistor and overload part numbers for machines that use dynamic braking to slow machines. Energy from the slowing motor is transferred to the inverter and dissipated using braking resistors.
There are 3 types of braking systems used with Milnor washer-extractors and centrifugal extractors. These are disc brakes, drum brakes, and brake resistor/inverter braking systems.
This article focuses on dynamic braking systems. Some machines use the inverter only to convert the energy generated from slowing motors. Other machines require braking resistors and an appropriate overload to dissipate energy that the inverter cannot absorb. A DC bus overvoltage error will occur if the inverter cannot take the energy from the motor without raising the DC bus voltage.
The part numbers referenced on this page are three resistors, 100 Ohm (adjustable), 50 Ohm, and 10 Ohm, a thermostat, and an overload relay. There is also a bracket (09MV10DBBK) recommended sold with part numbers 09MV050REV and 09MV100RES.
If you need the inverter part number, retrieve the CIMR number from your inverter and use the knowledge article link to get the Milnor part number. What is the part number for my Yaskawa inverter?
Models with Braking Resistors and/or Overload Relays.
There are model numbers that have changed design over the years. The tables below show the model code changes in regards to the dynamic braking system.
MODEL
BRAKE RESISTOR
OVERLOAD
THERMOSTAT
ADDITIONAL INFO
36026V7J
09MV100RES
09F024A
N/A
MODEL CODE AAF AND EARLIER HAVE OVERLOAD ONLY
36026V7J
09MV050REV
N/A
30RA175T
MODEL CODES AFTER AAF HAVE THERMOSTAT ONLY
MODEL
BRAKE RESISTOR
OVERLOAD
THERMOSTAT
ADDITIONAL INFO
30022V6J
09MV100RES
09F024A
30RA175T
MODEL CODES AAW AND BEFORE USE BOTH OVERLOAD AND THERMOSTAT
30022V6J
09MV100RES
N/A
30RA175T
MODEL CODES AFTER AAW USE THE TERMOSTAT. THEY DO NOT HAVE THE OVERLOAD
36026X8J
09MV050REV
09F024A
30RA175T
MODEL CODES AAE AND BEFORE USE BOTH OVERLOAD AND THERMOSTAT
36026X8J
09MV050REV
N/A
30RA175T
MODEL CODES AFTER AAE USE THE TERMOSTAT. THEY DO NOT HAVE THE OVERLOAD
MODEL
BRAKE RESISTOR
OVERLOAD
THERMOSTAT
ADDITIONAL INFO
42026V6J
09MV100RES
09F024A
N/A
MODEL CODES AAG AND BEFORE USE OVERLOAD ONLY
42026V6J
09MV010REV
N/A
30RA175T
MODEL CODES AFTER AAG USE THERMOSTAT ONLY
LOW VOLT (208/240V) MACHINES USE 10 OHM RESISTER
42026V6J
09MV050REV
N/A
30RA175T
MODEL CODES AFTER AAG USE THERMOSTAT ONLY HIGH VOLT (380/480V) MACHINES USE 50 OHM RESISTER
MODEL
BRAKE RESISTOR
OVERLOAD
THERMOSTAT
ADDITIONAL INFO
30022X8W
09MV100RES
N/A
30RA175T
MODEL CODES BEGINNING WITH AA HAVE NO OVERLOAD
30022X8W
09MV100RES
09F024A
30RA175T
MODEL CODES BEGINNING WITH AZ HAVE OVERLOAD LISTED IN THE SCHEMATICS.
Other model numbers with dynamic braking have different resistors for high voltage and low voltage machines.
