ab 1391-DES Series, User Manual

Page: 81 / 150

Chapter 8
Start-Up
8-12
To select Local Speed
a) Energize the speed select input, SEL 1 (terminals 1 & 2 of J2)
with either 24V DC or 115V AC. The front panel “SEL 1” LED
will illuminate.
b) Repeat the above step for any of the other three preset speeds.
Important: If more than one speed is selected at the same time,
the resulting speed for the velocity profile will not be predictable.
Important: In the following steps, the local speed control (SPD 1)
will be used. If your application utilizes remote speed pots, the
remote pot should be substituted for SPD 1.
7. Connect a voltmeter between terminals 11 (+) and 10 (–) of J1.
While monitoring the meter, turn the speed pot (SPD 1 or remote)
counterclockwise until the output voltage is approxi10V
DC. Toggle the FWD/REV switch. The voltage measured should
change in polarity.
If the polarity does not change, recheck the wiring and connections
of the FWD/REV relay and switch.
Important: Changing direction with the speed input follows the
accel/decel times set on the module.
8. Move the meter leads to drive terminals 1 (–) & 2 (+) of TB2. The
meter should indicate a voltage of approxi10V DC.
9. Rotate the Accel and Decel pots (located on the module front panel)
approximately 7 turns.
10. De-energize the SEL 1 input (terminals 1 & 2 of J2) and note the
time needed for the meter voltage to reach zero (minimum) volts.
Energize the SEL 1 input and note the time needed for the voltage to
reach +10V DC (maximum).
11. Adjust the Accel/Decel pots for desired ramp times (approximate
range is 0.25 to 6.5 seconds) by repeating step 10. The final ramp
time will be set during final system calibration. Rotate the speed pot
fully clockwise for minimum speed. Remove the SEL1 input.
ATTENTION: To protect against rapid accel/decel commands
from the module and possible machine damage or personal
injury, the “Bypass” input (terminals 19 & 20 of J2) must not be
energized. Applying 24V DC or 115V AC to this input will
remove the Accel/Decel pot settings from the circuit, causing
the output to immediately ramp to +10V DC or zero volts.
!