8
TROUBLESHOOTING HINTS
NORMAL:
When power (12 to 24 volts dc ) is applied, the POWER LED should be ON
solidly green
PROBLEM:
If the POWER LED remains off with power applied, check the cable
connections and the integrity of the cable.
PROBLEM:
It is important to remember that when powering up the DS71/DS72, metal
should not be present on the magnetic surface and in front of the probe face. The
controller reads the probe signal at power-up to determine the minimum signal level of
the probe.
The flash pattern and color of the multi-function LED on the DS71/DS72 can be helpful
in the diagnosis of problems with your installation. Check the following:
Immediately After Power-up
1.
NORMAL:
The multicolor LED flashes red then green at a 2.5 Hz rate to indicate
firmware version then turns off.
2.
PROBLEM:
The LED flashes green then red at a 2.5 Hz rate to indicate firmware
version number and then begins flashing red rapidly (10 Hz). This can indicate a)
there is metal present b) the probe is disconnected, or c) the cable to the probe has
an open, or d) the probe is faulty.
During Single-Hit Calibration
1.
NORMAL:
The LED constantly flashes amber at a 2.5 Hz rate. This is normal if no
metal is present in front of the probe face. It is a standby mode waiting on metal.
2.
PROBLEM:
Persistence of the above pattern with metal present can indicate a) the
metal is non-ferrous, b) the metal is too thin for the probe, or c) the probe is faulty.
During Two-Sample Calibration
1.
NORMAL:
After the pushbutton switch is pressed twice in less than 1 second, the
LED flashes amber at a 2.5 Hz rate. This is normal; the controller is waiting for the
second thickness of metal to be placed against the probe and the pushbutton to be
pressed once again.
2.
PROBLEM:
After the third press of the pushbutton (to record the second thickness),
the LED flashes amber at a rapid (10 Hz) rate. This indicates the two samples were
so close in thickness that the difference cannot be reliably discriminated.
