Allen-Bradley 1391B Series, Instruction Manual

Page: 48 / 82

Start-Up
Chapter 7
7-46
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9. The wires connected to terminals 1 & 2 of TB2 (Velocity Command
Input) must be marked and removed. A
±
10V DC local control
(battery box) is to be connected to these terminals. See Figure 7.1.
The polarity of the Command signal from the battery box should be
the same as the actual control source to assure correct motor rotation
when the controller is placed into operation as part of the system.
ATTENTION: Even though the Command SCALE
potentiometer is set to zero, the servomotor may begin to rotate
and cause incorrect machine movement when the controller is
enabled. Be prepared to remove controller power by opening
(MCB) or the branch circuit disconnect device if this occurs.
This movement may be due to a wiring error or system
component malfunction and must be corrected before
proceeding with this procedure. Damage to machine system
components can occur due to uncontrolled machine movements.
It is recommended that the motor be mechanically disconnected
from the load if:
A) Improper direction of rotation could cause damage to
equipment.
B) Uncontrolled motor rotation due to improper phasing will
cause damage to the equipment.
!
o
10. Once control connections are made:
a) Set Command input to zero at the battery box.
b) Open Enable switch.
c) Apply power to the transformer primary.
Place the circuit breaker (MCB) to the ON position. The green
DRIVE READY LED should illuminate.
Important: If power is applied while the controller is enabled, one
or more fault LED’s will illuminate and disable the controller. The
controller may be reset by removing the Enable signal and
momentarily grounding the Reset terminal (TB2-11). An alternate
method would be to remove and reapply the branch circuit or
controller power (36V CT) with the Enable input removed.
ATTENTION: In the following step, reverse rotation or
uncontrolled rotation at high speed can occur. To guard against
injury, read through the procedure before attempting to start the
motor.
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