20 Limits - ABB ACS350 User Manual

180
Parameters – complete descriptions
Index Name/Selection

20 LIMITS

2001 MINIMUM SPEED
-30000...30000 rpm
2002 MAXIMUM SPEED
0...30000 rpm
2003 MAX CURRENT
0.0...1.8 · I A
2N
2005 OVERVOLT CTRL
DISABLE
ENABLE
2006 UNDERVOLT CTRL
DISABLE
ENABLE(TIME)
ENABLE
Actual signals and parameters
Description
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
CTRL MODE.
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.
Speed
2001 value is < 0
2002
Allowed speed range
0
2001
Minimum speed
Defines the allowed maximum speed. See parameter
SPEED.
Maximum speed
Defines the allowed maximum motor current.
Current
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.
Overvoltage control deactivated
Overvoltage control activated
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
Undervoltage control deactivated
Undervoltage control activated. The undervoltage control is active for
500 ms.
Undervoltage control activated. No operation time limit.
Speed
2001 value is > 0
2002
Allowed speed range
2001
0
t
-(2001)
Allowed speed range
-(2002)
2001
Power loss ride-through on page 107.
Def, FbEq
9904 MOTOR
0
t
1 = 1 rpm
MINIMUM Eur: 1500 /
US: 1800
1 = 1 rpm
1.8 · I
2N
1 = 0.1 A
ENABLE
0
1
ENABLE
(TIME)
0
1
2