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IMPULSE•G+ Mini Advanced Instruction Manual – March 2014
5-22
Load Check II™
The Load Check II function is a load-limiting feature which ensures the programmed load limit of
the hoist is not exceeded. It prevents the lifting (and potential stall) of a load that is overweight.
When the IMPULSE•G+ Mini detects an overload condition it prevents any further lifting. The load
may then be lowered at the speed that is specified by the Load Check Lowering Speed (C05.08).
V/f Operation (A01.02 = 00)
When using Load Check II in V/f control mode (during lifting) the IMPULSE•G+ Mini will
compare the motor current readings (U01.03) to values stored during the Load Check set up process.
If they exceed the values for the active Load Check Zone, the IMPULSE•G+ Mini will stop based on
the LC Alarm Action (C05.02) and display a Load Check alarm (LC).
OLV Operation (A01.02 = 02)
When using Load Check II in Open Loop Vector control mode (during lifting) the IMPULSE•G+
Mini will compare the motor torque readings (U01.09) to values stored during the Load Check set up
process. If they exceed the values for the active Load Check Zone, the IMPULSE•G+ Mini will stop
based on the LC Alarm Action (C05.02) and display a Load Check alarm (LC).
NOTE:
If an application requires Load Check to be bypassed, an MFDI may be programmed to 69
(N.O.) or 6A (N.C.).
NOTE:
Precautions should be taken when using load check where two or more hoists are used to
lift a single load.
Example: Use a normally closed relay from the load check output to break the raise (FWD Run)
command to the other hoist(s). This will ensure that all hoists stop lifting if one hoist is
overloaded.
Load Check II Set Up (C05.01 = 09)
The Load Check set up procedure will quickly measure and calculate the current or torque required
at each of the Load Check Zones. These values will automatically be stored in parameters C05.09
through C05.24 during the Load Check set up process.
To following are the steps required to perform the Load Check set up process.
1. Verify that when the Master Switch is at full deflection (the highest speed point if stepped, or
10V if Analog), the Frequency Reference shown in U1-01 is equal to Motor Base Frequency
shown in E1-06 (typically 60Hz). For example, with a 3-Step speed reference, if B1-03 is set at
60Hz, then the frequency reference should be 60Hz when the Master Switch is pushed to full
deflection. If the frequency reference doesn’t reach Motor Base Frequency, set the following
(depending on Speed Ref):
•
Multi-Step: B1-0x is 60Hz
•
Infinitely Variable: B2-01 = 100%
•
Analog: H3-03 = 100% and B2-01 = 100%
2. Auto-tune the motor.
•
OLV operation – Rotational Auto-tune (stationary is acceptable, though not ideal).
•
V/f operation – Stationary Auto-tune.
3. Check that B02.03 and E01.09 are at their desired values. If you change these values, re-run
Load Check II set up.
Содержание 2001-G+M
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Страница 9: ...C h a p t e r 1 Introduction...
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Страница 17: ...C h a p t e r 2 Installation...
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Страница 25: ...C h a p t e r 3 Wiring...
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Страница 39: ...C h a p t e r 4 Getting Started...
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