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Group 20: Limits
This group defines minimum and maximum limits to follow in driving the motor –speed, frequency, current, torque, etc.
Table 12: Group 20 — Limits
Code
Name
2001
MINIMUM SPEED
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
Defines the maximum speed (rpm) allowed.
2003
MAX CURRENT
Defines the maximum output current (A) supplied by the drive to the motor.
2006
UNDERVOLT CTRL
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 .
2007
MINIMUM FREQ
Defines the minimum limit for the drive output frequency.
• A positive or zero minimum frequency value defines two ranges, one positive and one negative.
• A negative minimum frequency value defines one speed range. See the figure.
Note: Keep MINIMUM FREQ ≤ MAXIMUM FREQ.
2008
MAXIMUM FREQ
Defines the maximum limit for the drive output frequency.
2013
MIN TORQUE SEL
Defines control of the selection between two minimum torque limits (2015 MIN TORQUE 1 and 2016 MIN TORQUE 2).
0 = MIN TORQUE 1 – Selects 2015 MIN TORQUE 1 as the minimum limit used .
1 = DI1 – Defines digital input DI1 as the control for selecting the minimum limit used.
• Activating the digital input selects MIN TORQUE 2 value .
• De-activating the digital input selects MIN TORQUE 1 value .
2...6 = DI2...DI6 – Defines digital input DI2...DI6 as the control for selecting the minimum limit used.
• See DI1 above .
7 = COMM – Defines bit 15 of the Command Word 1 as the control for selecting the minimum limit used.
• The Command Word is supplied through fieldbus communication.
• The Command Word is parameter 0301 .
-1 = DI1(INV) – Defines an inverted digital input DI1 as the control for selecting the minimum limit used.
• Activating the digital input selects MIN TORQUE 1 value .
• De-activating the digital input selects MIN TORQUE 2 value .
-2...-6 = DI2(INV)...DI6(INV) – Defines an inverted digital input DI2...DI6 as the control for selecting the minimum limit used.
• See DI1(INV) above .
2014
MAX TORQUE SEL
Defines control of the selection between two maximum torque limits (2017 MAX TORQUE 1 and 2018 MAX TORQUE 2).
0 = MAX TORQUE 1 – Selects 2017 MAX TORQUE 1 as the maximum limit used .
1 = DI1 – Defines digital input DI1 as the control for selecting the maximum limit used.
• Activating the digital input selects MAX TORQUE 2 value .
• De-activating the digital input selects MAX TORQUE 1 value .
2...6 = DI2...DI6 – Defines digital input DI2...DI6 as the control for selecting the maximum limit used.
• See DI1 above .
7 = COMM – Defines bit 15 of the Command Word 1 as the control for selecting the maximum limit used.
• The Command Word is supplied through fieldbus communication.
• The Command Word is parameter 0301 .
-1 = DI1(INV) – Defines an inverted digital input di1 as the control for selecting the maximum limit used.
• Activating the digital input selects MAX TORQUE 1 value .
• De-activating the digital input selects MAX TORQUE 2 value .
-2...-6 = DI2(INV)...DI6(INV) – Defines an inverted digital input DI2...DI6 as the control for selecting the maximum limit used.
• See DI1(INV) above
OM 1191 • MD5 VFD
Range
Resolution
-30000...30000 rpm
1 rpm
0...30000 rpm
1 rpm
0... 1 .3 · I2
0 .1 A
n
0...2
1
-500 .0...500 .0 Hz
0 .1 Hz
0 .0...500 .0 Hz
0 .1 Hz
-6...7
1
-6...7
1
28
P
araMeTers
Default
User
S
0 rpm
1800 rpm (US)
1 .3 · I2
n
1 [ENABLE(TIME)]
0 .0 Hz
60 .0 Hz (US)
0 (MIN TORQUE 1)
0 (MAX TORQUE 1)
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