A-2 Dynamic Brake Hardware
MN715J
Dynamic Braking (DB) Hardware
Continued
General Machinery Load Calculations:
1.
Calculate braking duty cycle:
Duty Cycle
+
Braking Time
Total Cycle Time
2.
Calculate deceleration torque:
T
Decel
+
RPM change
Wk
2
308
time
*
Friction
(Lb
*
Ft)
where:
T
Decel
= Deceleration torque in lb-ft
Wk
2
= Inertia in lb-ft
2
time = In seconds
3.
Calculate watts to be dissipated in dynamic braking resistor:
Watts
+
T
Decel
ǒ
S
max
*
S
min
Ǔ
Duty Cycle
(0.0712)
where:
S
max
= Speed to start braking
S
min
= Speed after braking
4.
Multiply watts calculated in step 3 by 1.25 to allow for unanticipated
loads (safety factor).
15J Catalog Numbers with an “ER” Suffix
These controls include a factory-installed dynamic braking transistor. If
dynamic braking is required, use an optional external RGA brake resistor.
See RGA assemblies.
RGA Assemblies include braking resistors completely assembled and mounted
in a NEMA 1 enclosure. A listing of available RGA assemblies is provided in Table
A-2. The minimum resistance “Minimum Ohms” shown in the table is the
minimum resistor value that can be connected to the control without causing
damage to the internal dynamic brake transistor for ER controls.
115VAC controls must use 56 ohms or greater.
230VAC controls must use 56 ohms or greater.
460VAC controls must use 120 ohms or greater.
Table A-2 Dynamic Braking Resistor Assemblies (RGA)
Continuous
Rated Watts
Minimum Ohms
Rated Watts
30
60
120
150
100
RGJ160
RGJ1120
RGJ1150
200
RGJ260
RGJ2120
RGJ2150
300
RGJ360
RGJ3120
RGJ3150
600
RGA630
RGA660
RGA6120
1200
RGA1230
RGA1260
RGA12120
2400
RGA2430
RGA2460
RGA24120
4800
RGA4830
RGA4860
Summary of Contents for ID15J1F50-ER
Page 1: ...Series 15J Inverter Control 7 04 MN715J Installation and Operating Manual...
Page 5: ...iv Table of Contents MN715J...
Page 11: ...2 4 General Information MN715J...
Page 59: ...4 22 Programming and Operation MN715J...
Page 75: ...6 6 Specifications and Product Data MN715J...
Page 79: ...A 4 Dynamic Brake Hardware MN715J...
Page 86: ...Appendix C Remote Keypad Mounting Template MN715J Remote Keypad Mounting Template C 1...