ACH550-UH User’s Manual 1-115
Parameters
Group 20: LIMITS
This group defines minimum and maximum limits to follow in driving the motor –
speed, frequency, current, torque, etc.
Group 20: Limits
Code Description Range Resolution Default S
2001 MINIMUM SPEED -30000…30000 rpm 1 rpm 0 rpm
Defines the minimum speed (rpm) allowed.
• A positive (or zero) minimum speed value defines two ranges,
one positive and one negative.
• A negative minimum speed value defines one speed range.
• See the figure.
2002 MAXIMUM SPEED 0…30000 rpm 1 rpm 1800 (US)
Defines the maximum speed (rpm) allowed.
2003 MAX CURRENT 0.0… 1.3 • I
2n
0.1 A 1.3 • I
2n
Defines the maximum output current (A) supplied by the drive to the motor.
2006 UNDERVOLT CTRL 0…2 1 1 [ENABLE (TIME)]
Sets the DC undervoltage controller on or off. When on:
• If the DC bus voltage drops due to loss of input power, the undervoltage controller decreases the motor speed in
order to keep the DC bus voltage above the lower limit.
• When the motor speed decreases, the inertia of the load causes regeneration back into the drive, keeping the DC
bus charged and preventing an undervoltage trip.
• The DC undervoltage controller increases power loss ride-through on systems with a high inertia, such as a
centrifuge or a fan.
0 =
DISABLE – Disables controller.
1 =
ENABLE(TIME) – Enables controller with 500 ms time limit for operation.
2 =
ENABLE – Enables controller without maximum time limit for operation.
P 2001
P 2002
Speed
-(P 2001)
-(P 2002)
P 2002
P 2001
Speed range allowed
Speed range allowed
Speed range allowed
Time
Speed
Time
2001 value is > 0
0
0
2001 value is < 0
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