High/Low Speed Pot Selector

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