ALLEN-BRADLEY ALLEN-BRADLEY BULLETIN 1336 MACHINE STOP-ELECTRICAL APPLICATION NOTE #5 January 2, 1997 PURPOSE The purpose of this document is to provide guidelines for wiring and control schemes for the Bulletin 1336 AC Drive. This document is to be used as a suggestion only. Users must ensure that installations meet applicable codes and are suitable for the existing conditions. The Bulletin 1336 User Manual should be used as a reference to ensure that proper wire selection,routing,and fusing guidelines are followed. WHAT THIS NOTE CONTAINS The electrical machine stop is utilized to rapidly decelerate the motor and connected load. This mode of stopping requires that the drive has line power applied at all times and remains "logically enabled". The drive will not be able to control the stopping of the motor and load if power is removed or the logic is disabled. The Bulletin 1336 can be configured for different stopping modes. The Users will need to determine which mode best suits the application. INTENDED AUDIENCE This application note is intended to be used by personnel familiar with the hardware components and programming procedure necessary to operate the Bulletin 1336/1336VT. WHERE IT IS USED The diagrams, parameter settings, and auxiliary hardware used in this application note are designed to address specific issues in many different applications. Some changes by the Users may be necessary to apply the concepts of this document to a specific application. 1 ALLEN-BRADLEY DESCRIPTION The 1336 drive is configured by digital programming. For a controlled stop, the choices are DC INJECTION BRAKING or RAMP TO STOP. DC INJECTION BRAKING is selected by setting Parameter 10 to a value of 1. The Users can also select the amount of time the braking will be applied and the magnitude of the voltage used for braking with parameters 12 and 13. This mode of braking will generate up to 40% of rated motor torque for braking and is typically used for low inertia loads. Refer to table 1 for parameter settings. RAMP TO STOP is selected by setting Parameter 10 to a value of 2. The 1336 will ramp the frequency to zero based on the deceleration time programmed into parameter 8 and/or 31 (Decel Time #1 & #2). Parameter 11 (Decel Frequency Hold) must be set to zero to allow the drive to follow the programmed deceleration rate. The "normal" mode of machine operation can utilize Decel Time #1. If the "Machine Stop" mode requires a faster deceleration than Decel Time #1 allows,the "Machine Stop" can activate Decel Time #2 for a faster rate. Parameter 26 must be set to a value of 1 to access Decel Time #2. Refer to table 1 for parameter settings. DYNAMIC BRAKING is utilized to dissipate the regenerated energy from the motor during a rapid deceleration. When a STOP command is initiated and a short decel time is programmed, the motor operating mode changes from motoring to generating. The "speed" of the rotor will be greater than the "speed" of the stator. This will cause energy to flow from the rotor to the stator,and back into the drive in the form of dc-bus voltage. To prevent an over voltage on the dc-bus capacitor bank, the dynamic brake will "turn on" and dissipate the excess voltage across a resistor bank. This mode of braking will generate 100% motor torque for a 20% duty cycle,and allows the fastest decel time. To determine if a Dynamic Brake is required, the User must refer to the Bulletin 1336 Dynamic Brake Manual for specific details and calculations for correct brake selection. Refer to figure 1 for diagram. APPLICATION CONSIDERATIONS DC INJECTION BRAKING - This mode of stopping can cause excessive motor heating when used in cyclical applications or with overhauling loads that require high brake voltage levels. It is recommended to use the ramp-to-stop for applications with these characteristics. DYNAMIC BRAKING - The rating of the dynamic brake cannot exceed the rating of the drive. PARAMETER SETTINGS TABLE 1 7 8 ACCEL TIME 1 DECEL TIME 1 10 STOP SELECT 0-600 SECONDS 0-600 SECONDS 0=COAST TO STOP 1=DC INJECTION 2 ALLEN-BRADLEY 12 13 26 DC HOLD TIME DC HOLD VOLTS PRESET/2ND ACCEL 30 31 ACCEL TIME 2 DECEL TIME 2 2=RAMP TO STOP 0-15 SECONDS 0-115 VOLTS 0=PRESET SPEEDS 1=2ND ACCEL/DECEL 0-600 SECONDS 0-600 SECONDS 3 ALLEN-BRADLEY BULLETIN 1336 WITH DYNAMIC BRAKING 460V AC 48-62HZ L1 L2 L3 115V AC +DC -DC TB1 TB2 1 POT HIGH 2 POT WIPER BULLETIN TB1 1 2 3 4 1336 DYNAMIC BRAKE TB1 1 2 3 4 1336 DYNAMIC BRAKE TB1 1 2 3 4 1336 DYNAMIC BRAKE MASTER TB1 5 6 1336 3 POT/SIGNAL COMMON 4 0-10V INPUT 6 4-20MA INPUT 7 PULSE INPUT (-) 8 PULSE INPUT (+) 9 5V METER OUTPUT 10 AT SPEED 11 AT SPEED/RUN COMMON 12 RUN 13 FAULT 14 FAULT/NOT FAULT COMMON 15 NOT FAULT 16 ALARM 17 ALARM/NOT ALARM COMMON 18 NOT ALARM TB3 START STOP 5 M-STOP CUSTOMER INTERLOCK CUSTOMER INTERLOCK SLAVE SLAVE TB1 5 6 TB1 5 6 MOD-L3 115VAC INTERFACE 19 START 20 STOP 21 COMMON 22 JOG 23 REVERSE 24 SW1 25 COMMON 26 SW2 27 SPEED SELECT 28 AUX 29 COMMON 30 ENABLE TB1 M1 M2 M3 GND MOTOR FIGURE #1 4