PK and PW Series Braking Modules
Manuals:
The Powerohm PK and PW series of Brake/Resistor Modules and stand alone Brake Chopper Modules are designed as functional replacements for the Rockwell 1336 Mod KA, KB and KC units and 1336 W Series (Series A) offerings. Sold exclusively through the Rockwell channel, the PK series are drop in equivalents, form, fit and function and the PW Series are functional equivalents. The standard features of this design include external or internal brake enable, under voltage detection of logic supply, heatsink overtemperature protection and master/slave capability with CROWBAR CIRCUIT.
The PK Series Brake Modules are also used for the Kinetix series of Servo Motion products offered by Rockwell. In this case they are referred to as Shunt Modules. The use of braking modules and resistors increase the braking torque capability of a variable frequency drive and servo systems allowing faster and more controlled deceleration times.
If it is necessary to increase the horsepower requirements beyond the capability of a single braking module, the modules are all Master/Slave programmable. This allows an arrangement of multiple Modules to effectively function as a single higher rated module.
Application Information: AC variable frequency drives are commonly used with general purpose AC induction motors to form reliable variable speed drive systems. Problems with these drive systems can occur when an application requires a deceleration rate faster than what can be managed by the drive alone, or when motor speeds exceed the synchronous speed set by the output frequency of the drive (which is called an overhauling load condition). Both of these conditions create regenerated power which flows from the motor back into the drive, causing its DC Bus to rise. To manage the regenerated power and avoid shutting the drive down due to an over-voltage trip, this power must be dissipated by an external braking resistor. Braking Modules are used in conjunction with an AC drive to monitor the DC bus of the drive and activate external braking resistor as needed.
| Part Number | MFG Part Number | Line Voltage | Turn On Voltage | Resistance | Wattage Dissipation (avg.) | Crow Bar |
| PKA005 | 1336-MOD-KA005 | 240 | 375 | 28 | 667 | standard |
| PKA010 | 1336-MOD-KA010 | 240 | 375 | 13.2 | 1650 | standard |
| PKB005 | 1336-MOD-KB005 | 480 | 750 | 108 | 1500 | standard |
| PKB010 | 1336-MOD-KB010 | 480 | 750 | 52.7 | 2063 | standard |
| PKB050 | 1336-MOD-KB050 | 480 | 750 | 10.5 | 7000 | standard |
| PKC005 | 1336-MOD-KC005 | 600 | 940 | 160 | 1500 | standard |
| PKC010 | 1336-MOD-KC010 | 600 | 940 | 80 | 2063 | standard |
| PKC050 | 1336-MOD-KC050 | 600 | 940 | 15.9 | 8000 | standard |
| PKB005-800 | 1336-MOD-KB005 | 480 | 800 | 108 | 1500 | standard |
| PKB010-800 | 1336-MOD-KB010 | 480 | 800 | 52.7 | 2063 | standard |
| PKB050-800 | 1336-MOD-KB050 | 480 | 800 | 10.5 | 7000 | standard |