Operation Manual
35
If this happens, power off the equipment and power up again. Then, press once
(you should hear a short beep). (In the picture above you can see where this key is
situated).
Press again
, this time holding it until the image is visible. Finally you can continue
with the steps 3, 4 and 5.
2. Adjusting the Display Contrast
Once the max and min contrast adjustment values have been set with the above
procedure, you can easily regulate the display contrast between those limits to better
adapt the readability of the display to the surrounding light conditions. Beware that the
adjustment direction toggles each time the
key is pressed. This means that you will
not be able to effectively adjust the contrast with repetitive key presses. Instead, keep the
key pressed while watching the display. To invert the adjustment direction, simply release
and hold the key again until the desired contrast is attained.
3. Resetting the Microprocessor
A ‘hang’ microprocessor will cause the unit not to respond to the touch panel nor to the
ON/OFF switch. An internal RESET pushbutton is provided to recover the normal unit’s
operation. Do the following to access and use the RESET button:
1) Disconnect the unit from any external AC supply.
2) Remove the 6 4-mm Allen bolts that lock the front panel.
3) Grab the golden ground connector firmly and gently lift the front panel until a soft
stop is reached. Slide now the panel a little bit to the right so it can be further lifted
for a 3 to 4 mm aperture in the front edge. The 8-mm RESET button will then be
visible upside-down underneath the panel.
4) Press the RESET button for a short while and rest the panel in place.
5) Check the unit for correct operation and lock the panel in place with the Allen bolts.
Do not overtighten them.
PME-500-TR
36
4. CLOSE & TRIP Command Duration
The PME-500-TR’s factory settings include zero (0 ms) duration for the trip and close
command. This makes impossible to drive a circuit breaker’s operating coils for testing
and can lead to the erroneous conclusion that the unit is damaged or not working
properly. Do the following to set valid command duration values:
1) Touch the SET tab to go into the Test Settings Menu.
2) Highlight the “Duration” tag using the arrow
keys and touch the
MODIFY
key. The word EXIT and a list with the 4 programmable commands
will be displayed.
3) Using the arrow
keys, highlight the command (CLOSE, OPEN, INT1,
INT2) whose duration you want to set and touch the MODIFY
button. The
selected command’s present duration in milliseconds will be highlighted. Please
refer to the PME-500-TR user’s manual for a better understanding of these
commands in the context of circuit breaker testing.
4) Increase or decrease the duration time with the
arrow keys in 10-ms
steps and confirm the desired value touching the ENTER
button.
5) Repeat the above steps 3 thru 4 until you are done with all the changes. Then, use
the arrows to highlight the word EXIT and press ENTER
to leave the
DURATION adjustment menu.
5. Rechargeable battery issues
If your PME-500-TR cannot be switched on from its battery, or it shuts itself down early
after power-on, leave it switched off and connected to an AC supply for 48 h for a
complete battery charge.
The PME-500-TR battery subsystem features electronics for safe recharging and an
internal statistic counter that provides an approximate indication of the battery status. The
calculations made by this counter may accumulate errors, especially when the unit is left
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