ABB ACS350 Series, User Manual

Page: 180 / 314

Actual signals and parameters
180
20 LIMITS Drive operation limits.
Speed values are used with vector control and frequency values are used
with scalar control. The control mode is selected by parameter
9904 MOTOR
CTRL MODE.
2001 MINIMUM SPEED Defines the allowed minimum speed.
A positive (or zero) minimum speed value defines two ranges, one positive
and one negative.
A negative minimum speed value defines one speed range. 0
-30000…30000 rpm Minimum speed 1 = 1 rpm
2002 MAXIMUM SPEED Defines the allowed maximum speed. See parameter 2001 MINIMUM
SPEED.
Eur: 1500 /
US: 1800
0…30000 rpm Maximum speed 1 = 1 rpm
2003 MAX CURRENT Defines the allowed maximum motor current. 1.8 · I
2N
0.0…1.8 · I
2N
A Current 1 = 0.1 A
2005 OVERVOLT CTRL Activates or deactivates the overvoltage control of the intermediate DC link.
Fast braking of a high inertia load causes the voltage to rise to the
overvoltage control limit. To prevent the DC voltage from exceeding the limit,
the overvoltage controller automatically decreases the braking torque.
Note: If a brake chopper and resistor are connected to the drive, the
controller must be off (selection DISABLE) to allow chopper operation.
ENABLE
DISABLE Overvoltage control deactivated 0
ENABLE
Overvoltage control activated
1
2006 UNDERVOLT CTRL Activates or deactivates the undervoltage control of the intermediate DC link.
If the DC voltage drops due to input power cut off, the undervoltage controller
will automatically decrease the motor speed in order to keep the voltage
above the lower limit. By decreasing the motor speed, the inertia of the load
will cause regeneration back into the drive, keeping the DC link charged and
preventing an undervoltage trip until the motor coasts to stop. This will act as
a power-loss ride-through functionality in systems with a high inertia, such as
a centrifuge or a fan. See section
Power loss ride-through on page 107 .
ENABLE
(TIME)
DISABLE Undervoltage control deactivated 0
ENABLE(TIME) Undervoltage control activated. The undervoltage control is active for
500 ms. 1
ENABLE Undervoltage control activated. No operation time limit. 2
Parameters – complete descriptions
Index Name/Selection Description Def, FbEq
2001
2002
Speed
-(2001)
-(2002)
2002
2001
Allowed speed range
Allowed speed range
Allowed speed range
t
Speed
t
2001 value is > 0
0 0
2001 value is < 0