Chapter 7 Optional AccessoriesMH300
For safety, install a thermal overload relay (O.L) between the brake unit and the brake resistor in conjunction
with the magnetic contactor (MC) before the drive for additional protection. The thermal overload relay protects
the brake resistor from damage due to frequent or continuous braking. Under such circumstances, turn off the
power to prevent damage to the brake resistor, brake unit and drive. Attention: Do NOT interrupt the connection
of the brake resistor by switching ON / OFF the power.
Fig. 7-2
2. Any damage to the drive or other equipment caused by using brake resistors and brake modules that are not
provided by Delta voids the warranty.
3. Consider environmental safety factors when installing the brake resistors. If you use the minimum resistance
value, consult local dealers for the power calculation.
4. When using more than two brake units, the equivalent resistor value of the parallel brake unit cannot be less
than the value in the column “Minimum Resistor Value (Ω)”. Read the wiring information in the brake unit user
manual thoroughly prior to operation. Visit the following links to get the instruction sheets for the wiring in the
brake unit:
VFDB2015 / 2022 / 4030 / 4045 / 5055 Braking Modules Instruction Sheet
https://downloadcenter.deltaww.com/downloadCenterCounter.aspx?DID=1525&DocPath=1&hl=en-US
VFDB4110 / 4160 / 4185 Braking Modules Instruction Sheet
https://downloadcenter.deltaww.com/downloadCenterCounter.aspx?DID=1516&DocPath=1&hl=en-US
VFDB6055 / 6110 / 6160 / 6200 Braking Modules Instruction Sheet
https://downloadcenter.deltaww.com/downloadCenterCounter.aspx?DID=8592&DocPath=1&hl=en-US
5. The suggested value in the tables above are for general application. If the AC motor drive requires frequent
braking, increases the watts by two to three times.
6. Thermal Overload Relay (TOR): Choosing a thermal overload relay is based on whether its overload capacity is
appropriate for the MH300. The standard braking capacity of the MH300 is 10% ED (Tripping time = 10s). As
shown in the figure below, the thermal overload relay continuously operates for 10 seconds and it can withstand
a 260% overload (Host starting).
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