ALLEN-BRADLEY ALLEN-BRADLEY BULLETIN 1336 HIGH/LOW SPEED APPLICATION NOTE # 13 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 Bulletin 1336 remote speed pot can be configured for a HIGH/LOW function with the use of a selector switch and fixed resistors. This allows the Users 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 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 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 2-position 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. The result is a limited voltage supplied to the speed pot and thus 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. Another resistor is then 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 has to 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 a F09 fault will occur. This fault code is for an open pot return. The speed pot should be limited to a 340 degree maximum turn. The recommended wattage value for the fixed resistors and potentiometer are 2 watt. PARAMETER SETTINGS PARAMETER # 5 7 8 TABLE 1 NAME FREQ. SELECT 1 ACCEL TIME 1 DECEL TIME 1 SETTING 5 = REMOTE SPEED POT 0-600 SECONDS 0-600 SECONDS 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. 2 ALLEN-BRADLEY BULLETIN 1336 WITH HIGH/LOW SPEED SELECTION 460V AC 48-62HZ L1 L2 L3 115V AC TB1 LOW HIGH TB2 1 POT HIGH 2 POT WIPER BULLETIN 10K 10K 1336 3 POT/SIGNAL COMMON 10K 4 5 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 MOD-L3 115VAC INTERFACE 19 START 20 STOP 21 COMMON 22 JOG STOP CUSTOMER INTERLOCK CUSTOMER INTERLOCK 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 3