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
Range
Resolution
Default
User
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 rpm (US)
Defines the maximum speed (rpm) allowed.
2003 MAX CURRENT
0… 1 .3 · I2
n
0 .1 A
1 .3 · I2
n
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 .
2007 MINIMUM FREQ
-500 .0…500 .0 Hz
0 .1 Hz
0 .0 Hz
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
0 .0…500 .0 Hz
0 .1 Hz
60 .0 Hz (US)
Defines the maximum limit for the drive output frequency.
2013 MIN TORQUE SEL
-6…7
1
0 (MIN TORQUE 1)
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
-6…7
1
0 (MAX TORQUE 1)
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
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