Rockwell Automation M3575TL Snubber Braking Kits, AC Drives, Enclosed - Manual (Page 15)

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
before touching any internal components. Failure to observe this precaution could result in severe
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
for 460 VAC Braking Units) or greater because this wiring may come into contact with uninsulated
230 VAC (or 460 VAC) components. Failure to observe this precaution could result in damage
to, or destruction of, the equipment.