Delta VFD9A0MS43ANSHA User Manual

Chapter 7 Optional AccessoriesMS300 (High Speed Model)
7-3
*
1
Standard braking torque is 125 %. Because of the limited resistor power, the longest operation time for 10 % ED is 10sec.
(on: 10 sec. / off: 90 sec.).
*
2
Please refer to the Brake Performance Curve for “Operation Duration & ED (%)” vs. “Braking Current”.
*
3
Calculation for braking torque is for a 4-pole motor 1800 rpm.
*
4
Resistors of 400 W or lower should be fixed to the frame and at a surface temperature below 50 °C.
Resistors of 1000 W and above should be fixed on a surface with temperature below 350 °C
NOTE
1. Please select the resistance value, power and brake usage (ED %) acc. to Delta rules.
Definition for Brake Usage ED %
For safety concern, install a thermal overload relay (O.L) between the brake unit and the brake resistor in
conjunction with the magnetic contactor (MC) before to the drive for additional protection. The purpose of the
thermal overload relay is to protect the brake resistor from damage due to frequent or continuous braking.
Under such circumstances, just turn off the power to prevent damaging the brake resistor, brake unit and
drive.
2. If the drive or other equipment is damaged due to the fact that the brake resistors and brake modules in use
are not provided by Delta, warranty will be void.
3. Take the safety of the environment into consideration when installing the brake resistors. If the minimum
resistance value is to be used, consult local dealers for the calculation of the power.
4. When using more than 2 brake units, equivalent resistor value of parallel brake unit can’t be less than the
value in the column “Minimum Equivalent Resistor Value for Each AC Drive” (the right-most column in the
table). Please read the wiring information in the user manual of brake unit thoroughly prior to operation
5. Thermal Overload Relay (TOR):
To choose a thermal overload relay is based on its overload capacity whether is appropriate to MS300. The
standard braking capacity of MS300 is 10 % ED (Tripping time=10s). As shown in the figure below, thermal
overload relay continuously operates for 10 sec. and it can stand 260 % overload (Host starting). Take a 460V,
15 kW of MS300 as an example, its braking current is 24A (refer to the table on page 7-3), thus it can use the
thermal overload relay which rated current is 10A (10*260 % = 26A > 24A).
60
40
30
20
10
T
ri
p
p
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n
g
t
i
m
e
8
3
2
4
6
1
0.8
0.6
0.4
0.3
0.8 1
1.5
2
3
4
5
6810 1579
Multiple of current setting
xln (A)
Second
Explanation: ED (%) is defined to allow enough time for
the brake unit and brake resistor to
dissipate the heat generated by braking.
Recommended cycle time T0 is one
minute.

Delta VFD9A0MS43ANSHA Specifications

General

Brand	Delta
Model	VFD9A0MS43ANSHA
Category	Controller
Language	English