ALLEN-BRADLEY ALLEN-BRADLEY BULLETIN 1336 PLUS HIGH/LOW SPEED POT SELECTOR APPLICATION NOTE # 1336S - 13 June 24, 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 Bulletin 1336S remote speed pot can be configured for a HIGH/LOW function with the use of a selector switch and fixed resistors. This allows the User to switch from a LOW speed to HIGH speed with the switch and still utilize the POT to trim the speed. 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 User may be necessary to apply the concepts of this document to a specific application. Faxback Document # 3033 Web location Http://WWW.AB.COM Page 1 of 3 ALLEN-BRADLEY DESCRIPTION The addition of two fixed resistors is necessary to create an offset for the HIGH/LOW function. The following operating frequencies are based on a drive minimum frequency setting of zero hertz and a maximum of 60 HZ. Installing a 10K ohm resistor between TB2 terminal 1 and the high end of the speed pot will create a maximum frequency of 33HZ when the remote speed pot is fully CW. Installing the 10K ohm resistor between TB2 terminal 3 and the return of the speed pot will create a minimum limit of 33HZ. To complete the circuit, a 2position selector switch is utilized to select which resistor is in the circuit. With the switch in the LOW position, the resistor between TB2 terminal 1 and the speed pot will cause a voltage drop resulting in a frequency range from 0-33HZ. When the switch is set to the HIGH position, the resistor between TB2 terminal 1 and the speed pot is bypassed with the switch. The other resistor is pulled into the circuit between TB2 terminal 3 and the speed pot return. This resistor will cause a voltage drop after the pot creating a frequency range of 33-60HZ. Refer to figure 1 for diagram. Overlapping contacts on the selector switch are not required for this application. A 3-position selector may be used to offer a MID speed. The MID setting would open both sets of contacts. The frequency range will be from 23-46HZ. APPLICATION CONSIDERATIONS When operating in the LOW speed mode the full range of the speed pot can be utilized. In the HIGH speed mode the speed pot must not be turned fully CW or an OPEN POT FAULT will occur. The speed pot should be limited to a 340 degree maximum turn. The recommended wattage value for the fixed resistors and potentiometer are 2 watts. PARAMETER SETTINGS Number 7 8 10 Group Setup Setup Setup Name Freq Select 1 Accel Time 1 Decel Time 1 Value 1=Remote Pot 0-600 Sec 0-600 Sec The acceleration and deceleration times set in parameters 7 and 8 determines the rate of change in frequency between the minimum and maximum frequency settings. Faxback Document # 3033 Web location Http://WWW.AB.COM Page 2 of 3 ALLEN-BRADLEY FIGURE 1 HIGH/LOW SPEED POT 115V AC R S T GND TB1 TB2 BULLETIN 1336PLUS 1 POT HIGH 2 POT LOW 3 POT/SIGNAL COMMON 4 5 0-10V INPUT 6 4-20MA INPUT 7 PULSE INPUT (-) 8 PULSE INPUT (+) 9 METER OUTPUT 10 JUMPER J5 CR1 11 1-2 (4-20ma) CR2 3-4 (0-10vdc) 12 13 CR3 14 CR3 15 16 CR4 17 CR4 18 115VAC INTERFACE TB3 START 19 TB3 INPUT 1 ENCODER B 31 STOP EXT FAULT INTERLOCK CUSTOMER INTERLOCK 20 STOP ENCODER A 32 21 COMMON ENCODER B 33 22 INPUT 3 ENCODER A 34 23 INPUT 4 ENC. +12V 35 24 INPUT 5 ENC. COMM 36 25 COMMON 26 INPUT 6 27 INPUT 7 28 INPUT 8 29 COMMON 30 ENABLE INPUT MODE 2 TB1 U V W GND Faxback Document # 3033 Web location Http://WWW.AB.COM Page 3 of 3