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Diagnostics Optimization CT MODBUS RTU Technical Data
170 E300 Design Guide
Issue Number: 1
Table 7-27 Motor contactor control
7.12 Load cell compensation
Load cell compensation uses the elevator car load cell to apply a torque reference to overcome the mass of the people in the elevator car when
running preventing roll back on brake release.
Any of the 3 analog inputs may be routed to Load Cell Compensation Input (E11). It is expected that the output from the load cell is a ±10 Vdc type
suitable for connection to the Unidrive M analog inputs. Scaling and offsetting of the load cell signal is achieved using the standard features of the
analog input used.
The final load cell compensation torque reference is sampled once (see description for Elevator Software State 2 in Table 9-13 State machine and
control state on page 445) and used as a torque feed forward reference. Sampling once prevents noise generated during travel, electrical or
mechanical, from being detected by the load cell and injected as a torque reference.
Figure 7-17 Load cell compensation
Drive active
Direction
FAST disable
STO, Drive enable
Creep Speed
Start lock
Speed selection
Torque producing current
Debounce motor contactors (100 ms)
Interlock delay (> 50 ms)
Control terminal 26
Ramp torque (100 ms)
Ramp torque (100 ms)
Control terminal 29
Control terminal 28
Control terminal 31
Motor contactor control
Motor contactor control
Brake output
Control terminal 25
Motor contactors
V1 Creep Speed Reference ()G01
()Creep Stop Jerk G18
()Brake Control Apply Delay D05
Creep Stop
Deceleration Rate ()G17
()Run Jerk 1 G13
()Brake Control Release Delay D04
Analog Input
Analog
Input Scaling
x(-1)
Analog Input
(Any analog Input)
Final Torque
Reference
Load Cell
Compensation
Torque
Analog Input
Offset
Load Cell
Compensation
Input
Load Cell
Compensation
Enable
Load Cell
Compensation
Filter TC (E12)
+
7.31
+
+
Analog Input
Destination
+
+
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