Chapter 7 Optional AccessoriesME300
7-4
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.
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
instruction sheet 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
http://www.deltaww.com/filecenter/Products/download/06/060101/Option/DELTA_IA-
MDS_VFDB_I_EN_20070719.pdf
VFDB4110 / 4160 / 4185 Braking Modules Instruction Sheet
http://www.deltaww.com/filecenter/Products/download/06/060101/Option/DELTA_IA-MDS_VFDB4110-
4160-4185_I_EN_20101011.pdf
VFDB6055 / 6110 / 6160 / 6200 Braking Modules Instruction Sheet
http://www.deltaww.com/filecenter/Products/download/06/060101/Option/DELTA_IA-MDS_VFDB6055-
6110-6160-6200_I_TSE_20121030.pdf
5. Thermal Overload Relay (TOR):
Choosing a thermal overload relay is based on whether its overload capacity is appropriate for the ME300.
The standard braking capacity of the ME300 is 10% ED (Tripping time=10 s). As shown in the figure below,
the thermal overload relay continuously operates for 10 seconds and it can withstand a 260% overload (Host
starting). For example, a 460V, 7.5 kW ME300 has a braking current of 10.2 A (refer to the tables in this section),
so it can use the thermal overload relay with a rated current of 5 A (5*260% = 13 A > 10.2 A).
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