Rockwell Automation M3575RH Series User manual

Snubber Braking Kits for AC Drives 1
Snubber Braking Kits for AC Drives
Enclosed Resistor Modules, Enclosed Transistor Modules
Model Numbers
M3575RH__, M3575RL__, M3575TH__, M3575TL__
Instruction Manual D2-3439-1
Product Description
Snubber Braking kits connect to 230 VAC and 460 VAC GV3000/SE, SP120, SP500, and VSM500 drives.
These kits dissipate the power regenerated by the motor during rapid deceleration or during overhauling load
conditions.
The regenerated energy is normally consumed, as shown in figure 1, by mechanical loss, by the motor, and by
the drive. The remaining energy is stored in the drive’s DC bus capacitor. If the remaining energy causes the
capacitor voltage to rise above the normal operating range, the Braking Unit will discharge the regenerated
energy before the drive voltage becomes excessive.
Power resistors are used to dissipate the energy. When the DC bus voltage rises above normal level, either a
built-in transistor (in GV3000/SE bookshelf drives) or an external transistor (used with NEMA-type GV3000/SE,
SP500, and VSM500 drives) automatically switches the dynamic braking resistors on in
pulse-width-modulation (PWM) mode to absorb the excess energy. The transistor is turned fully on at 375 VDC
for 230 VAC input drives and at 750 VDC for 460 VAC input drives. The snubber resistors are sized to provide
the power dissipating capability required for the duty cycle of the application.
!ATTENTION:Only qualified electrical personnel familiar with the construction and operation of
this equipment and the hazards involved should install, adjust, operate, and/or service this
equipment. Read and understand this manual and other applicable manuals in their entirety
before proceeding. Failure to observe this precaution could result in severe bodily injury or loss
of life.
Figure 1 – Dissipation of Energy Regenerated by the Motor
Energy
Regenerated
bythe Motor
Consumption
by Mechanical
Loss
Consumption
intheMotor
Itself (approx.
10 to 20%of
Output
Consumption
by the Drive
Itself
Storage in
Capacitor of
the Drive
Discharge of
Regenerated
Energy at
Braking Unit

2 Enclosed Resistor Modules, Enclosed Transistor Modules
Snubber Braking kits are available:
•as an Enclosed Resistor module for use with an AC drive containing a built-in transistor switching circuit
(such as the GV3000/SE Bookshelf AC drive) or for use in conjuction with an enclosed transistor module
(M/N M3575T__)
•as an Enclosed Transistor module (M/N M3575T__) for use with AC drives that do not contain a built-in
transistor switching circuit and for use with the enclosed resistor modules (M/N M3575R__)
Note that all of the Enclosed Resistor modules and Enclosed Transistor modules are rated for a maximum
on-time of 60 seconds at a specified duty cycle (see tables 1, 2, 5 and 6).
For GV3000/SE Bookshelf drives: Refer to tables 1, 2, and 3 to ensure that the Enclosed Resistor kit
matches your drive.
For AC Drives requiring both an Enclosed Resistor kit and an Enclosed Transistor kit: Refer to tables 4,
5, and 6 to ensure that the braking kits match your drive and your braking horsepower requirements.
Snubber Resistor Kits (M3575RH__, M3575RL__)
The figure below depicts the breakdown of the Snubber Resistor kit part number.
Enclosed Resistor Braking Unit Fault Output
Enclosed Resistor Braking units have one normally-closed contact (NC) rated at 1 amp @ 24 VDC or
0.5 amp @ 115 VAC that opens on an overtemperature fault condition ( 85 C or higher).
M3575R H 2 M F
Base Model Number
AC Voltage Rating
L = 230 VAC
H = 460 VAC
Horsepower Rating
Chassis Style
B = Bookshelf Style
M = Mini (Standard Enclosed Style)
G = Grid Resistors (G1, G2, G3)
Cooling Option
F = Internal Fan

Enclosed Resistor Modules, Enclosed Transistor Modules 3
Tables 1 and 2 show the rating data for the Enclosed Resistor Braking kits.
Table 1 – Enclosed Resistor Braking Kit Ratings (230 VAC)
Braking Kit
Model Number Braking HP
Braking
Duty
Cycle1
1. Maximum on-time is 60 seconds.
Braking Watts Max.
Amp
Rating
Load
Ohms
(±10%) Enclosure
TypePeak Continuous
M3575RL1M
M3575RL1MF 16% 20% 746 50 150 2190 M4
M3575RL2M
M3575RL2MF 26% 20% 1492 100 300 495 M4
M3575RL3B
M3575RL3BF 36% 20% 1989 100 400 575 B4
M3575RL3M
M3575RL3MF 36% 20% 2238 150
450 663 M4
M3575RL4M
M3575RL4MF 46% 20% 2984 200 600 848 M7
M3575RL5B
M3575RL5BF 56% 20% 3979 200 800 10 38 B4
M3575RL6M
M3575RL6MF 66% 20% 4476 300 900 12 32 M7
M3575RL8B
M3575RL8BF 86% 20% 5968 300 1200 15 25 B4
M3575RL9M
M3575RL9MF 96% 20% 6714 450 1350 18 21 M10
M3575RL11B
M3575RL11BF 11 6% 20% 7967 400 1600 20 19 B7
M3575RL16B
M3575RL16BF 16 6% 20% 11936 600 2400 31 13 B7
M3575RL24B
M3575RL24BF 24 6% 20% 17904 900 3600 47 8 B10

4 Enclosed Resistor Modules, Enclosed Transistor Modules
Table 2 – Enclosed Resistor Braking Kit Ratings (460 VAC)
Braking Kit
Model Number Braking HP
Braking
Duty
Cycle1
1. Maximum on-time is 60 seconds.
Braking Watts Max.
Amp
Rating
Load
Ohms
(±10%) Enclosure
TypePeak Continuous
M3575RH1M
M3575RH1MF 16% 20% 746 50 150 1780 M4
M3575RH2M
M3575RH2MF 26% 20% 1492 100 300 2390 M4
M3575RH3M
M3575RH3MF 36% 20% 2238 150 450 3260 M4
M3575RH4M
M3575RH4MF 46% 20% 2984 200 600 4195 M7
M3575RH5B
M3575RH5BF 56% 20% 4000 250 800 5150 B4
M3575RH6M
M3575RH6MF 66% 20% 4476 300 900 6130 M7
M3575RH8B
M3575RH8BF 86% 20% 6000 350 1200 890 B4
M3575RH9M
M3575RH9MF 96% 20% 6714 400 1350 987 M10
M3575RH11B
M3575RH11BF 11 6% 20% 8000 450 1600 11 60 B7
M3575RH16B
M3575RH16BF 16 6% 20% 12000 700 2400 16 45 B7
M3575RH24B
M3575RH24BF 24 6% 20% 18000 1000 3600 24 30 B10
M3575RH50G1F 50 20% 40000 8000 53 14 G1
M3575RH100G2F 100 20% 80000 16000 106 7G2
M3575RH150G3F 150 20% 120000 24000 159 5 G3

Enclosed Resistor Modules, Enclosed Transistor Modules 5
Table 3 shows the acceptable matches, by braking horsepower, between GV3000/SE Bookshelf drives and
Enclosed Resistor Braking kits. For actual sizing information, refer to “Selecting and Sizing Snubber Braing
Resistors” on page 18 of this manual.
Table 3 – Matching Enclosed Resistor Braking Kits with GV3000/SE Bookshelf Drives
GV3000/SE
Bookshelf Drive
Model Number
Can use snubber resistor kits rated at the following braking HP
Volts/Hertz Vector
31ER/31ET4060 1 HP to 3 HP 1 HP to 2 HP
38ER/38ET4060 1 HP to 4 HP 1 HP to 3 HP
55ER/55ET4060 1 HP to 4 HP 1 HP to 4 HP
85ER/85ET4060 1 HP to 6 HP 1 HP to 6 HP
126ER/126ET4060 1 HP to 9 HP 1 HP to 6 HP
150ER/150ET4060 1 HP to 9 HP 1 HP to 8 HP
240ER/240ET4060 1 HP to 11 HP 1 HP to 11 HP
300ER/300ET4060 1 HP to 16 HP 1 HP to 16 HP
430ER/430ET4060 1 HP to 24 HP 1 HP to 24 HP

6 Enclosed Resistor Modules, Enclosed Transistor Modules
Enclosure
Type
Dimension in mm (in)
A BCDEFGH
M3 323,8
(12.75) 76,2 (3.0) 95,6 (7.70) n/a 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M4 323,8
(12.75) 101,6 (4.0) 95,6 (7.70) 44,5 (1.75) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M7 323,8
(12.75) 177,8 (7.0) 95,6 (7.70) 127 (5.0) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M10 323,8
(12.75) 254 (10.0) 95,6 (7.70) 203,2 (8.0) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
B4 450,8
(17.75) 101,6 (4.0) 95,6 (7.70) 44,5 (1.75) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 221 (8.7)
B7 450,8
(17.75) 177,8 (7.0) 95,6 (7.70) 127 (5.0) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 233,7 (9.2)
B10 450,8
(17.75) 254 (10.0) 95,6 (7.7) 203,2 (8.0) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 246,4 (9.7)
Figure 2 – Resistor Braking Kit Enclosure Dimensions
1.00 B
D
.28 .28
A
.75
E
G
H
C
F
Sized for 1/4” Bolts or Studs
Terminal Strip

Enclosed Resistor Modules, Enclosed Transistor Modules 7
Figure 3 – Resistor Braking Kit Enclosure Dimensions (Floor-Mount Models)
Front View Side View
0.56"
29"
2.0"
B
3.5"
A
18"
4.25"
2.5"
2.0"
0.56"
21.88"
14.75"
1.63"
Foot Print
.56" X 1.0"
(4 Places)
31"
40"
49"
Chassis Dim.A Dim.B
G3
G2
G1
56.75"
47.75"
38.75"
Dimensions
Field Connection
Terminals Are
Located Behind
Filter Screen
22"
25"
1.0" 47.75"

8 Enclosed Resistor Modules, Enclosed Transistor Modules
Installing the Enclosed Resistor Braking Kit
Choose the installation site for the Enclosed Resistor Braking Unit with the following considerations in mind:
•The unit must be mounted in a clean, dry environment. The maximum ambient air temperature should not
exceed 40° C (104° F).
•The mounting surface must be non-flammable, as the unit may generate high temperatures during operation.
•The unit requires a minimum clearance of (2 inches) in all directions.
Use the following procedure to install Braking Units housed in NEMA 1 enclosures.
Step 1. Disconnect, lock out, and tag input power to the drive. Wait five minutes for the DC bus capacitors to
discharge.
Step 2. Verify that there is no voltage at the drive’s input power terminals.
Step 3. Measure the drive’s DC bus potential with a voltmeter to ensure that the DC bus capacitors have fully
discharged as described in the drive’s instruction manual.
Step 4. Select a location for the Braking Unit within 8 feet of the drive where the heat generated by the
snubber resistors will not affect surrounding components. Do not mount the Braking Unit under the
drive or where convective air flow is restricted.
Step 5. Mount the Braking Unit vertically with the fan at the bottom. Mounting hardware is not provided. See
figure 2 or 3 for mounting dimensions.
Step 6. Install the wiring between the drive and the Braking Unit. See figures 4, 5, and 8. Use wire that is
rated at a minimum of 300 volts for 230 VAC Braking Units and 600 volts for 460 VAC Braking Units.
Step 7. Reapply input power to the drive. Refer to the drive’s instruction manual for complete start-up
information.
!ATTENTION:Equipment is at line voltage when AC power is connected to the drive. The drive’s
DC bus capacitors retain hazardous voltages after input power has been disconnected. After
disconnecting input power, wait five (5) minutes for the DC bus capacitors to discharge and then
check the DC bus voltage with a voltmeter to ensure the DC bus capacitors are discharged
beforetouchinganyinternalcomponents.Failuretoobservethisprecautioncouldresultinsevere
bodily injury or loss of life.
ATTENTION:The user is responsible for conforming with all applicable local, national, and
international codes. Failure to observe this precaution could result in damage to, or destruction
of, the equipment.
!ATTENTION:It is important to use wire rated at 300 volts for 230 VAC Braking Units (600 volts
for460VACBrakingUnits)orgreaterbecausethiswiringmaycomeintocontactwithuninsulated
230 VAC (or 460 VAC) components. Failure to observe this precaution could result in damage
to, or destruction of, the equipment.

Enclosed Resistor Modules, Enclosed Transistor Modules 9
Braking Resistor Unit Field Connection Notes
Observe the following precautions when making field connections:
•Do not connect the Braking Resistor Unit directly across the DC bus. This would exceed the maximum
duty cyle rating of the load. The extreme overheating generated by the load resistors under this condition
could present a fire hazard in and around the resistive load module.
•Be sure the Braking Resistor Unit being connected meets the minimum load resistance requirements listed
in table 1 or table 2.
•Field connection terminals used on the bookshelf style and standard enclosed style Braking Resistor units
will accept a 10 AWG maximum wire size. Wires should be stripped 0.25”. Crimp-style terminations are not
recommended.
•Wire types and sizes should be chosen in accordance with local, national, and/or international electrical
codes as well as module termination limitations to meet the voltage and current levels present for the
application.
!ATTENTION: Only qualified personnel familiar with the construction and operation of this
equipment and the hazards involved should install or service this equipment. The user is
responsible for conforming with all applicable local, national, and international codes. Failure to
observe these precautions could result in personal injury and/or damage to, or destruction of,
the equipment.
Figure 4 – Wall-Mounted Braking Resistor Unit Field Connections
Ground
3 Line
Ground
Motor and Drive
M3575R Braking Resistor Unit Field Connections
NOTES
115 VA
C
Temp alarm opens upon a fault and is rated at 0.5 amps (115 VAC).
1.
2.
18 AWG
To Braking
Module
SeeNote1
For Drives With Internal Braking Transistor (such as GV3000/SEBookshelf drives)
+ Brake Out
- Brake Out
SeeNote2
Refer to drive instruction manual for drive connections.
FAN
(OPTIONAL)
115VAC 115VAC
ALARM
TEMP
RES RES
123456
M3575R
U
V
W
(-)
45
(+) 47
48
L1
L2
L3

10 Enclosed Resistor Modules, Enclosed Transistor Modules
Figure 5 – Floor-Standing Grid Resistor Unit Field Connections
123 546
JUMPER
HOT OVERTEMP115 VAC
Resistive Load Connections
12
#8 Screw Terminals
1/2" Coarse Threaded Studs
ALARMOUTPUT
Typical Resistive Load
SeeTerminal StripDetail
FAN
FanPower
OverTemp
FaultSwitch
TempSwitch.
(DO NOT REMOVE)
NEUT
115 VAC
Fan Power / AlarmConnections

Enclosed Resistor Modules, Enclosed Transistor Modules 11
Snubber Transistor Kits (M3575TH__, M3575TL__)
The figure below depicts the breakdown of the Enclosed Transistor kit part number.
Enclosed Transistor Braking Unit Status Indicators
Braking units have the following status indicators:
•DC BUS: A green LED that turns on when the DC bus voltage is equal to or greater than 90 VDC.
•ACTIVE BRAKING: A red LED that turns on when the dynamic braking transistor turns on. Note that if this
indicator is on continuously, the AC line voltage may be high. Use an input transformer to reduce the
incoming AC line voltage to the AC drive or consult your local Rockwell Automation - Reliance Electric sales
office for assistance.
Enclosed Transistor Braking Unit Fault Outputs
Enclosed Transistor Braking units have one normally-closed contact (NC) rated at 2 amps, 125 VDC or
125 VAC that opens on the following fault conditions:
•loss of DC bus voltage
•open load
•Overtemperature
•transistor failure
Table 4 – Enclosed Transistor Kit Ratings
AC Line
Voltage Braking Kit Model Number Amps DC RMS Minimum Load
Resistance (Ω)Enclosure
Type
230 M3575TL15 15 25 M3
M3575TL30 30 12.5
M3575TL60 60 6.25 M4
460 M3575TH15 15 50 M3
M3575TH30 30 25
M3575TH75 75 10 M4
M3575TH125 125 6 B4
M3575TH150 150 5
M3575TH200 200 3.75 B7
M3575TH300 300 2.5
M3575T L 30
Base Model Number
AC Voltage Rating
L = 230 VAC
H = 460 VAC
DC Current Rating

12
Enclosed Resistor Modules, Enclosed Transistor Modules
Table 5 – Matching Enclosed Transistor Kits and Enclosed Resistor Kits (230 VAC)
Transistor
Braking Kit
Model Number Braking HP
DC
Amps
RMS
6% Duty Cycle1
1. Maximum on-time is 60 seconds
20% Duty Cycle1
Enclosure
Type
Resistor
Braking Kit
Model Number
Peak
Braking
Watts
Continuous
Braking
Watts
Resistor
Braking Kit
Model Number
Peak
Braking
Watts
Continuous
Braking
Watts
M3575TL15 1 2 M3575RL1M 746 50 M3575RL1MF 746 150 M4
2 4 M3575RL2M 1492 100 M3575RL2MF 1492 300 M4
3 6 M3575RL3M 2238 150 M3575RL3MF 2238 450 M4
3 5 M3575RL3B 1989 100 M3575RL3BF 1989 400 B4
4 8 M3575RL4M 2984 200 M3575RL4MF 2984 600 M7
510 M3575RL5B 3979 200 M3575RL5BF 3979 800 B4
612 M3575RL6M 4476 300 M3575RL6MF 4476 900 M7
815 M3575RL8B 5968 300 M3575RL8BF 5968 1200 B4
M3575TL30 9 18 M3575RL9M 6714 450 M3575RL9MF 6714 1350 M10
11 20 M3575RL11B 7967 400 M3575RL11BF 7967 1600 B7
M3575TL60 16 31 M3575RL16B 11936 600 M3575RL16BF 11936 2400 B7
24 47 M3575RL24B 17904 900 M3575RL24BF 17904 3600 B10

Enclosed Resistor Modules, Enclosed Transistor Modules
13
Table 6 – Matching Enclosed Transistor Kits and Enclosed Resistor Kits (460 VAC)
Transistor
Braking Kit
Model
Number Braking HP
DC
Amps
RMS
6% Duty Cycle1
1. Maximum on-time is 60 seconds
20% Duty Cycle1
Enclosure
Type
Resistor
Braking Kit
Model Number
Peak
Braking
Watts
Continuous
Braking
Watts
Resistor Braking
Kit Model
Number
Peak
Braking
Watts
Continuous
Braking
Watts
M3575TH15 1 1 M3575RH1M 746 50 M3575RH1MF 746 150 M4
2 2 M3575RH2M 1492 100 M3575RH2MF 1492 300 M4
3 3 M3575RH3M 2238 150 M3575RH3MF 2238 450 M4
4 4 M3575RH4M 2984 200 M3575RH4MF 2984 600 M7
5 5 M3575RH5B 4000 250 M3575RH5BF 4000 800 B4
6 6 M3575RH6M 4476 300 M3575RH6MF 4476 900 M7
8 8 M3575RH8B 6000 350 M3575RH8BF 6000 1200 B4
9 9 M3575RH9M 6714 400 M3575RH9MF 6714 1350 M10
11 11 M3575RH11B 8000 450 M3575RH11BF 8000 1600 B7
M3575TH30 16 16 M3575RH16B 12000 700 M3575RH16BF 12000 2400 B7
24 24 M3575RH24B 18000 1000 M3575RH24BF 18000 3600 B10
M3575TH75 50 53 — — — M3575RH50G1F 40000 8000 G1
M3575TH125 100 106 — — — M3575RH100G2F 80000 16000 G2
M3575TH200 150 159 — — — M3575RH150G3F 120000 24000 G3

14 Enclosed Resistor Modules, Enclosed Transistor Modules
Enclosure
Type Dimension in mm (in) A BC D E F G H
M3 323,8
(12.75) 76,2 (3.0) 95,6 (7.70) n/a 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M4 323,8
(12.75) 101,6 (4.0) 95,6 (7.70) 44,5 (1.75) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M7 323,8
(12.75) 177,8 (7.0) 95,6 (7.70) 127 (5.0) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
M10 323,8
(12.75) 254 (10.0) 95,6 (7.70) 203,2 (8.0) 304,8 (12.0) 266,7 (10.5) 28,7 (1.13) 221 (8.7)
B4 450,8
(17.75) 101,6 (4.0) 95,6 (7.70) 44,5 (1.75) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 221 (8.7)
B7 450,8
(17.75) 177,8 (7.0) 95,6 (7.70) 127 (5.0) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 233,7 (9.2)
B10 450,8
(17.75) 254 (10.0) 95,6 (7.7) 203,2 (8.0) 425,5 (16.75) 381 (15.0) 35,1 (1.38) 246,4 (9.7)
Figure 6 – Enclosed Transistor Braking Kit Enclosure Dimensions
1.00 B
D
.28 .28
A
.75
E
G
H
C
F
Sized for 1/4” Bolts or Studs
Terminal Strip

Enclosed Resistor Modules, Enclosed Transistor Modules 15
Installing the Enclosed Transistor Braking Kit
Choose the installation site for the Enclosed Transistor Braking Unit with the following considerations in mind:
•The unit must be mounted in a clean, dry environment. The maximum ambient air temperature should not
exceed 40° C (104° F).
•The unit requires a minimum clearance of (2 inches) in all directions.
Use the following procedure to install Braking Units housed in NEMA 1 enclosures.
Step 1. Disconnect, lock out, and tag input power to the drive. Wait five minutes for the DC bus capacitors to
discharge.
Step 2. Verify that there is no voltage at the drive’s input power terminals.
Step 3. Measure the drive’s DC bus potential with a voltmeter to ensure that the DC bus capacitors have fully
discharged as described in the drive’s instruction manual.
Step 4. Select a location for the Braking Unit within 8 feet of the drive where the heat generated by the
snubber resistors will not affect surrounding components. Do not mount the Braking Unit under the
drive or where convective air flow is restricted.
Step 5. Mount the Braking Unit vertically with the fan at the bottom. Mounting hardware is not provided. See
figure 6 for mounting dimensions.
Step 6. Install the wiring between the drive and the Braking Unit. See figures 7 and 8. Use wire that is rated at
a minimum of 300 volts for 230 VAC Braking Units and 600 volts for 460 VAC Braking Units.
Step 7. Reapply input power to the drive. Refer to the drive’s instruction manual for complete start-up
information.
!ATTENTION:Equipment is at line voltage when AC power is connected to the drive. The drive’s
DC bus capacitors retain hazardous voltages after input power has been disconnected. After
disconnecting input power, wait five (5) minutes for the DC bus capacitors to discharge and then
check the DC bus voltage with a voltmeter to ensure the DC bus capacitors are discharged
beforetouchinganyinternalcomponents.Failuretoobservethisprecautioncouldresultinsevere
bodily injury or loss of life.
ATTENTION:The user is responsible for conforming with all applicable local, national, and
international codes. Failure to observe this precaution could result in damage to, or destruction
of, the equipment.
!ATTENTION:It is important to use wire rated at 300 volts for 230 VAC Braking Units (600 volts
for460VACBrakingUnits)orgreaterbecausethiswiringmaycomeintocontactwithuninsulated
230 VAC (or 460 VAC) components. Failure to observe this precaution could result in damage
to, or destruction of, the equipment.

16 Enclosed Resistor Modules, Enclosed Transistor Modules
Figure 7 – Transistor Braking Unit Wiring Diagram
3575C1
CONTROL
BOARD
DC BUS
HEAT SINK
BRAKING
Indicators
NOTES
1.
22 AWG BLUE
22 AWG RED
24VDC FAN
123456
22 AWG
TWISTED
ACTIVE
22 AWG
TWISTED
RED
LED GREEN LED
Field Connections
1 (C)
2 (NC)
3 (NO)
1
2
TB1
TB2
TB3
DC+
DC - RES -
ACTIVE
BRAKING
CONTROL
POWER
+
--
+
(Not used on
RED
RED
See Note 1
TB3 alarm contact opens upon a fault.
RED 12AWG
BLACK 12AWG
RED 12AWG
WHITE 12AWG
BLUE TRACK 18AWG
BLUE 18AWG
DC BUS (+)
DC BUS (--) RES
ALARM
RES
ALARM
RED
WHITE
RED
WHITE
WHITE BLACK
RES +
BRAKING
15A to 30A units)

Enclosed Resistor Modules, Enclosed Transistor Modules 17
Braking Transistor Unit Field Connection Notes
Observe the following precautions when making field connections:
•The maximum wire sizes accepted by the Braking Transistor Unit field connection terminals are as follows:
•Minimum load resistance requirements listed in tables 1 and 2 must be followed when selecting a resistive
load for use with the Braking Transistor Unit.
!ATTENTION: Only qualified personnel familiar with the construction and operation of this
equipment and the hazards involved should install or service this equipment. The user is
responsible for conforming with all applicable local, national, and international codes. Failure to
observe these precautions could result in personal injury and/or damage to, or destruction of,
the equipment.
Model Number Max Wire
Size
M3575TL15
M3575TL30 M3575TH15 M3575TH30 10 AWG
M3575TL60 M3575TH75 6 AWG
M3575TH125
M3575TH150 M3575TH200 M3575TH300 3/8” ring lug
Figure 8 – Braking Transistor and Braking Resistor Unit Field Connections
AC
DRIVE
Ground
3 Line
Ground
Motor And Drive
M3575T with M3575RBraking Module Field Connections
Notes
The minimum load requirement must be followed.
DC BUS
115VAC
ALARM
TEMP
115 VAC
Alarmcontacts open upon a fault andare rated at 0.5 amps (115 VAC).
1.
2.
3.
RES
DC+
DC-
Note 4
See
Note 2
See
To Braking
Module
Ground
M3575T
-DC Bus
+DC Bus
SeeNote3
M3575R
123456
+-
RES RES
RES RES
115VAC
( OPTIONAL )
FAN
23456
Refer to drive instruction manual for drive connections.
FAULT
ALARM
1
Alarmcontacts open upon a fault andare rated at 2.0 amps (125 VDC or 125 VAC).4.

18 Enclosed Resistor Modules, Enclosed Transistor Modules
Selecting and Sizing Snubber Braking Resistors
Continuous duty snubber braking resistors must be selected for the transistor switching circuit versions of the
Braking unit.
Use the following procedure to select the snubber resistors:
Step 1. Calculate the regenerated power (Pave) from the load and the pattern of operation. See figure 9.
Pave = 0.5 x Ppx t/T
Where: Pp= Peak Power
t = Rise/Fall Time
T = Period
Step 2. Calculate the power dissipation of the resistor (Pd) by deducting 15% of the motor’s rated output
(energy dissipation by the machine and the motor) from the regenerated power (Pave).
Step 3. Use the following formula to determine the required resistor power rating (Pr) in watts:
Pr= (3 to 4) x Pdwatts
M3575T
Transistor Only M3575R
Resistors
Max On-Time = 60 seconds
Duty Cycle ≤0.20 or 20% Maximum On-Time = 60 Seconds
Duty Cycle ≤20% with fans
Duty Cycle ≤6% without fans
Figure 9 – Braking Unit Duty Cycles
t
brake
t
cycle
time
Braking
Power
v
t
brake
= on-time
Duty Cycle = t
brake
t
cycle

Enclosed Resistor Modules, Enclosed Transistor Modules 19
Troubleshooting
If a problem occurs on start-up or during normal operation, refer to the table below.
Problem Corrective Action
Resistor Braking Unit
Drive trips on overvoltage or
self-limits its decel rate – Ensure that the resistive load module is properly connected to the drive’s braking control circuitry. This can be a chopper module internal to the drive or
an external braking kit.
– Verify the ohmic value of the resistive load (see table 1).
– Ensure that the resistive load is adequately sized for the application.
The cooling fan doesn’t turn on – Verify that temperature of load module exceeds 45°C.
– Verify that 115 VAC is present for fan voltage.
Temp alarm contact is open
indicating an overtemp fault is
present
– If the fault output is open and the chassis is hot, allow the unit to cool and
recheck the fault output; it should return to its normally closed state.
– If the fault output is open and the chassis is cool, replace the unit.
Temp alarm contact does not open
on overtemp condition – If the fault output remains closed and the chassis temperature exceeds 85°C,
disconnect the load module and allow the unit to cool. Once the chassis has
cooled, replace the unit.
Transistor Braking Unit
Green DC Bus Power LED does not
come on – Ensure proper DC bus voltage at the unit’s input terminals. If the proper bus voltage is not present, ensure that the voltage rating of the unit matches the
drive.
Red Active Braking LED stays on or
flashes during motoring operation – Ensure that the voltage rating of the unit matches the drive. – If line voltage is abnormally high orlow, the unit may require special calibration
adjustments. Contact Reliance for assistance.
Fault output on unit is open
indicating a fault is present – If the fault output is open and the chassis is hot, allow the unit to cool and recheck the fault output; it should return to its normally closed state.
– If the fault output is open and the chassis is cool, check the resistor path to
make sure it is not open.
– Remove DC bus power from the unit and then restore power. If the fault output
remains open, replace the unit.
Drive trips on overvoltage or
self-limits its decel rate – Ensure that the green DC Bus Power LED is on. – Ensure that the proper resistive load value is connected to the unit and that the
maximum current rating is not exceeded.
– Ensure the unit is not exceeding the current rating. The braking IGBT will shut
down on overcurrent conditions. Check for a fault output.

U.S. Drives Technical Support
Tel: [phone], Fax: [phone], Email: [email protected], Online: www.ab.com/support/abdrives
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Publication D2-3439-1- March 2000 Copyright © 2000Rockwell Automation, Inc. All Rights Reserved. Printed in USA.