ALLEN-BRADLEY ALLEN-BRADLEY BULLETIN 1336 PLUS MOTOR STOP-MECHANICAL APPLICATION NOTE #1336S - 6 May 19, 1997 PURPOSE The purpose of this document is to provide guidelines for wiring and control schemes for the Bulletin 1336S 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 1336S 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 mechanical motor stop is utilized to rapidly decelerate the motor and connected load to a stop. This mode of stopping does not require the drive to control the motor deceleration and therefore power is not necessary for the circuit to operate. A mechanical brake will be utilized to stop the machine. 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 1336S. 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. TERMS AND DEFINITIONS Enable - Control input to the drive at TB3 terminal 30 used to enable or disable the inverter. 4K - Interposing relay to maintain brake contacts while running. 1TD - Time delay relay to ensure that the brake is released prior to starting the drive. BK1 - Mechanical brake relay used to energize the brake. Faxback Document #3026 Web location Http://WWW.AB.COM Page 1 of 3 ALLEN-BRADLEY DESCRIPTION The Motor Stop will be used to open the ENABLE circuit and also interrupt power to the coil of the MECHANICAL BRAKE. Refer to Figure 1 for diagram. This circuitry could also include an INPUT or OUTPUT CONTACTOR on the drive that opens upon initiation of the Motor Stop. Mechanical brakes require a snubber/surge suppressor on the coil to absorb the transient when the coil is de-energized. When the contacts are opened, a large voltage transient will occur, therefore a surge suppressor must also be installed on the contacts, located as close to the brake as possible. The suppressor must be on the load side of the contactor. In the drive enclosure, the brake contactor should be located as far from the drive as possible. Control wiring should be twisted pair or shielded. Separate the brake wires from all others. If brake wires must cross control wires, keep them perpendicular to each other. The brake wires must be run in separate conduit from the motor and control wiring. When utilizing a mechanical brake for a Motor Stop it is important to use a separate start/stop circuit for normal operation. This will allow the user to have a selectable stop mode (parameter #10). Many large mechanical brakes have long coil pick-up times. The User must ensure that the start command to the drive is coordinated with the actual release point of the brake. If this is not done properly, the drive will attempt to start the motor while the brake is engaged, causing a potential over current fault trip on the drive. To prevent this situation, the User can implement one of the following: • Delay the run command until the brake releases • Use a low Dwell Frequency until the brake releases • Use a 2-step acceleration ramp (slow until brake releases) • Reduce low end voltage using the Custom V/HZ. This will also reduce starting torque and may not be desired for a given application. SUPPRESSORS ELECTRO-CUBE 1676-13 type suppressors are recommended for use on the brake contacts (230/460VAC). Bulletin 100 contactors utilize suppressor 199-FSMA1 (120vac)this suppressor can also be utilized on the other relay coils unless otherwise specified. Faxback Document #3026 Web location Http://WWW.AB.COM Page 2 of 3 ALLEN-BRADLEY FIGURE 1 MACHINE STOP MECHANICAL R 115V AC S T GND +DC BRK/-DC TB1 TB2 1 POT HIGH 2 POT WIPER 3 POT COMMON 4 SIGNAL COMMON 5 0-10V INPUT 6 4-20ma INPUT 7 PULSE INPUT (-) 8 PULSE INPUT (+) 9 METER OUTPUT JUMPER J5 1-2 (4-20ma) 3-4 (0-10vdc) 10 CR1 11 CR2 (RUN) 12 13 CR3 4K 14 CR3 4K 15 BK1 16 START CR4 17 CR4 1TD 18 TB3 L6E 115VAC INTERFACE TB3 1TD 19 START ENCODER B 31 20 STOP ENCODER A 32 21 COMMON ENCODER B 33 22 REVERSE ENCODER A 34 23 JOG +12VDC 35 24 AUXILIARY ENC COM 36 25 COMMON 26 SPD SEL 3 27 SPD SEL 2 28 SPD SEL 1 29 COMMON 30 ENABLE STOP EXT FAULT INTERLOCK M-STOP INPUT MODE 2 TB1 U V W GND BK1 BK1 BRAKE Faxback Document #3026 Web location Http://WWW.AB.COM Page 3 of 3