Rockwell Automation 1397 Open Chassis Dynamic Brake - Manual (Page 8)

1397 Open Chassis Dynamic Brake 8
1397-5.15 March, 1999
1397-DB- A001L — A150L
B003L — B300L
Dynamic Brake Kit Operation
181/L1
81
1FU
A1 (+)
DB
45 (–)
A1
A2
5
6
A1
DBR 45
A1
A2
DB
DB RESISTOR
13
(33)
14
(34)
3 2 4 F1 F2 1
P6-5 P6-2 P5-5
P5-6 35-F2 37-F1
DBCR
13
FROM
FIELD
SUPPLY
14
FAN
AUX
ARMATURE
SUPPLY
1397 DRIVE
DYNAMIC BRAKE
RESISTORS
DYNAMIC BRAKE
CONTACTOR
DYNAMIC BRAKE TERMINAL BLOCK
2FU
282
281
2SS R
DB AUX
3FU
283
AC
INPUT
82
83
182/L2
182/L3
MOTOR SHUNT FIELD
MOTOR ARMATURE
CUSTOMER SUPPLY
1
120V AC
2
5
3
6
4
Remove and lockout all power to the drive and follow the wiring diagram above.
➊ Connect user supplied leads between drive terminals A1 & 45 and DB resistor assembly terminals 3 & DBR.
➋ If the motor has a series field, connect the motor series leads between drive terminal 45 and DB resistor
terminal DBR.
➌ Connect the suppressor included with the kit between DB contactor terminals A1 and A2 and place the label
included with the kit near the contactor.
➍ Use auxiliary contacts 33 & 34 when available.
➎ Remove the jumper between terminals 3 & 4 at the drive terminal block and connect user supplied leads
between drive terminals 2, 3 & 4 and DB contactor terminals A1, 13 & 14.
➏ Connect the user supplied 120VAC DB contactor power supply as shown.
Refer to 1397-DB-A001L — A150L/B003L — B300L Dynamic Brake Kit Operation
above and proceed to Setup on the last page.
1397-DB- A001L — A150L
B003L — B300L
Wiring
Dynamic braking slows down a rotating DC motor and its load. It is an uncontrolled process. During dynamic
braking, the motor armature is disconnected from the drive. A resistor is placed across the motor’s rotating
armature (now acting as a generator), and the resulting current causes braking torque in the motor. The motor
will decelerate, even with a drive malfunction, as long as motor shunt field excitation is maintained.
The drive must have the DC contactor open for dynamic braking to occur. Dynamic Braking is typically initiated
with a Coast/DB stop command or a drive fault. Under drive fault conditions, the DC contactor opens and applies
the dynamic braking grid across the armature for a dynamic braking stop.