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APEX615n Installation Guide
CURRENT LOOP COMPENSATION — #7 & #8: These two switches control the
dynamics of the APEX6151's current feedback loop. Use these switches to match the drive's
performance to your particular motor's characteristics. For Compumotor APEX and SM
motors, set the switches according to the table below. If you use a motor from another vendor,
call Compumotor's Applications Department for instructions on setting these two DIP
switches for your motor. (see toll-free number on inside front cover)
APEX or SM MOTOR #7 #8
SM233B OFF OFF
APEX602, SM231A, SM232A OFF ON
APEX603 ON OFF
RESERVED ON ON
Switch 2 (SW 2)
CONTINUOUS CURRENT — #1, #2, #3: If the APEX6151 goes into current
foldback, it reduces its output current down to the continuous current level set by these three
switches.
MOTOR SET CONTINUOUS CURRENT TO #1 #2 #3
SM231A, SM232A 3.4 amps OFF ON OFF
APEX603 4.0 amps OFF ON ON
SM233B, APEX602 6.0 amps ON OFF ON
PEAK CURRENT — #4, #5, #6: These three switches set the peak current that the
APEX6151 will produce.
MOTOR SET PEAK CURRENT TO #4 #5 #6
SM231A, SM232A 9.5 amps OFF ON OFF
APEX603 14 amps ON OFF ON
APEX602, SM233B 16 amps ON ON ON
TIME CONSTANT — #7 & #8: These two switches set the motor thermal time
constant, which the foldback circuit uses to estimate motor behavior. Consult your motor
specifications to determine your motor's thermal time constant. The following table shows
switch settings for time constants of 10, 20, 30, and 40 minutes. The table also shows the
switch settings to use for APEX and SM motors.
TIME CONSTANT MOTOR #7 #8
10 Minutes APEX602 OFF OFF
20 Minutes APEX603 OFF ON
30 Minutes SM231A, SM232A ON OFF
40 Minutes SM233B ON ON
The time constant is NOT the time until foldback occurs. It is a parameter based upon the
motor's physical characteristics, with the motor mounted to a suitable heatsink.
Three variables (continuous current, actual current, and time constant) affect the amount of
time that the foldback circuit allows operations to continue before foldback occurs. For a full
explanation of the foldback circuit, see Chapter ƒ Advanced Features. The following equation
gives an approximate time, in minutes, for a motor that operates from a cold start.
time
(in minutes)
= Time Constant − ln 1−
I
continuous
I
actual
2
I
continuous
is the continuous current, which you selected when you set switches #1, #2, and
#3. I
actual
is the actual peak current, whose maximum value you selected when you set
switches #4, #5, and #6.
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