Shanghai STEP Electric Corporation
Chapter 8 Elevator Elevator Commissioning Guide
cause "PGO" fault, or over-current fault, especially when
lift car is fully or heavily loaded.
Note: Properly reducing F0 and F1 will increase the comfort of the elevator, but also
decrease the operational efficiency. Properly increasing the time of the four corners F2 ~ F5 can
improve the comfort, but also decrease the operational efficiency.
Figure 8.4 Elevator Operation Curve
4) Adjust Comfort at Stop
The following two points affect the elevator comfort most at stop: 1. the PID value in
low-speed section. According to the previous section, adjusting the PID value in low-speed section
may help the elevator gain the best comfort at stop. 2. Timing for stop. It is mainly the
coordination between the reference speed at stop and the brake action. The ideal state is: when the
reference speed is zero, elevator has just held the brake. The adjustment principle is: if the elevator
jerks at stop, it means the brake is held too early; the other hand, if the elevator skids at stop, it
means the brake is held too late.
8.9 Leveling Adjustment
After comfort adjustment, leveling accuracy can be regulated.
1. Basic conditions to ensure the elevator leveling
（1）Ensure the door area sensor and the deck board are installed very accurately, which means:
The deck length at door area of each floor must be accurate and consistent;
The bracket must be solid;
The deck boards should be installed at accurate. When the lift car is at leveling position,
the deck center should coincide with the center between sensors of two doors. Otherwise,
there will be leveling deviation of this floor, which means it is higher or lower than the
upper and lower leveling points.
（2）If a magnetic sensor switch is used, the deck board should be inserted deep enough when
installed. Otherwise, it will affect the action time of the sensor switch, and lead to higher on
top and lower on bottom when leveling on this floor.
（3）To ensure leveling, the system also requires elevator to creep for a short distance before
stop.
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