MCE Load Weigher
5-67
5
iControl DC
Installation Method # 2
1. Re-use pre-existing holes or brackets to mount sensor and target.
2. When using supports created for other load weighers, be sure to arrange sensor and tar-
get so that increasing the weight in the car increases the clearance between the proxim-
ity sensor and the target.
3. Always use the target bracket for the target as it will flex slightly and not damage the
sensor during any rebound while doing a buffer test, etc.
4. If the voltage between LW+ and LW- varies depending on where the weight is in the
car, use Installation Method #1 instead.
Installation Method # 3
• Mount the sensor on the top of the car. This has the advantage of being the most conve-
nient location, both for installation and for later adjustment. However, there are disadvan-
tages to this approach as well.
• The first is that the sensor and target bracket are usually more exposed to accidental
physical damage (critical because the system depends on precise clearances between
the sensor and target).
• Second, since the inclination of most installers would be to mount the target directly to
the top of the cab, the extra weight of an elevator adjuster on the cartop often creates
problems during adjustment or if they happen to be riding there temporarily during
normal operation, especially since the top of the cab is not as structurally rigid as the
floor.
If locating the load weigher on the car top is necessary, better results can be obtained by making
up a target bracket assembly similar to Figure 8.6 and attaching it to the edges of the elevator
cab, making it less sensitive to cab top flexing. Then, mount the sensor so it is supported by the
crosshead. This can give a very good result, but requires additional expertise on the part of the
installer.
When mounting the sensor on top of the car, be sure to arrange the sensor and target bracket so that
increasing the weight in the car increases the clearance between the proximity sensor and the target.
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