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E300 Design Guide 171
Issue Number: 1
Table 7-28 Load cell compensation
Load cell compensation uses the Elevator car external load cell to apply a torque reference to overcome the mass of the Elevator car preventing roll
back on brake release. The external load cell compensation is sampled once during the start.
When this feature is active, any analog input may be routed to Load Cell Compensation Input (E11) to be used as the external load cell compensation
input, where it is expected that the output from the external load cell will be a ±10 V.
Position locking Start Lock Enable (I22) must not be used at the same time as load cell compensation Load Cell Compensation Enable (E10). The
load cell compensation is not applied during an autotune.
Correct operation of load cell compensation requires adjustment to be made under the following conditions:
• Balanced elevator car:
For a balanced elevator car, the torque shown in Load Cell Compensation Torque (E13) must be 0. If it is not 0 adjust the offset for the analog input
used.
• Empty elevator car
After the balanced elevator car load cell offset has been made, the scaling for the analog input used must be modified with an empty elevator car.
When the brake releases but before the elevator car accelerates, if the scaling for the analog input used is setup correctly then Speed Error (J31) = 0
(in RFC-A and RFC-S mode) and Final Torque Reference (J27) = Load Cell Compensation Torque (E13), indicating that the torque reference
required to hold the car still is provided by the load cell compensation.
Parameter Detail
Load Cell Compensation Enable (E10) Enables the load cell compensation torque offset to be applied
Load Cell Compensation Input (E11)
The input to the load cell compensations scheme. This is used as the
destination for the analog input which receives the load cell signal
Load Cell Compensation Filter Time Constant (E12)
Filters the final load cell torque reference such that the effect of electrical
noise in the load cell signal, or mechanical disturbances during travel
affecting the load cell compensation are minimized
Load Cell Compensation Torque (E13) Indicates the final torque reference in 0.1 % of system rated torque units
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