WPC 1000 User Manual 1125100
Initialization, Setup, and Checkout 3-7
Installing the Overrun Sensor Magnet
This section shows you how to install the magnet that, with the overrun sensor, makes up the
overrun limit switch. You should already have installed the overrun sensor (see page 2-25).
The overrun limit switch enables WPC 1000 to monitor operation of the resolver and to stop
the press whenever the resolver fails to work properly.
The press cannot be run in Continuous or Single-stroke unless the overrun sensor and magnet
are installed and working properly. Without the overrun limit switch, you can only operate
the press in Inch.
The angle at which you mount the magnet depends on the Top-stop “On” Angle. You must
first determine and set the Top-stop “On” Angle before installing the magnet.
Setting the Top-stop “On” Angle
To determine the angle at which the Top-stop command is given on your press and change the
Top-stop “On” Angle setting on the WPC 1000 display, do the following:
INCORRECT INSTALLATION OF OVERRUN LIMIT SWITCH
Ensure that the overrun sensor magnet is installed at a proper location if you have Two-hand
Control without light curtains, or light curtains with muting. Proper installation of the magnet
ensures that if the Top-stop output relay fails, a hazardous situation will not occur on the
downstroke. The magnet must be mounted as close as possible to the Top-stop “On” Angle (see
Table 3-3, page 3-9).
Failure to comply with these instructions could result in death or serious injury.
For a variable-speed press, you need to determine the latest Top-stop “On” Angle, which is the
angle at which the press top-stops at its slowest speed and with the shortest stopping angle/time.
BEFORE YOU SET THE TOP-STOP “ON” ANGLE, MAKE SURE THAT
• The press ram has been mechanically set to top dead center (TDC) (see NOTICE on page 2-2)
• The resolver has been aligned as close as possible to TDC (i.e., 0° ±2°) (see Mounting the
Resolver, page 2-23)
• The resolver has been zeroed (see page 3-4)
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