Emerson Control Techniques Focus 3N, Руководство пользователя

Страница: 41 / 82

Page 35
urrent Feedback Range C (JP9)
FOCUS Catalog DC Output Current JP9
Number (Amps) Jumper Position
2.7 No Jumper
(1/4 – 2 HP) 5.5 A
F3N2C 6.4 B
F3N2E 7.5 C
10 D
6.6 No Jumper
(3 – 5 HP) 13.8 A
F3N5C 16 B
F3N5E 18.75 C
25 D
Current Control Mode
ocus 3 Drives can be configured to operate in the Curren which is often
ferred to as making the drive a “Current Regulator”. Since motor torque is directly
roportion Regulator is often
ferred to
*If usin ing
adjust
JP2:
JP ck, but do not use a tachometer.
JP9: Select the appropriate current feedback range.
ACCEL and DECEL pots: Set to full counterclockwise position.
LOCAL CURRENT LIMIT pot: Set to full clockwise position.
F
t Control Mode
re
p
al to the armature current, a drive configured as a Current
as a “Torque Regulator”. re
g the Focus drive as Torque Regulator, make the follow
ments:
Select current (CUR) control
4: Select tachometer (TACH) feedba
In torque control mode, the motor speed is determined by how much load there is on the
motor and the torque level set on the drive. If torque in the motor (as set by the Drive) is
set to a level higher than what is required to move the load, the motor will accelerate in
speed until either the load from the motor increases to the level set by the drive or the
drive reaches its maximum output voltage (as set by the line voltage).
In the case of a lightly loaded motor,
the motor could accelerate to almost
twice-base
speed under these conditions.
In this mode the user be aware of this and MUST PROVIDE OVERSPEED PROTECTION.