Trouble-Shooting - Ahlborn ALMEMO 710 Operating Instructions Manual

15. Trouble-shooting

15. TROUBLE-SHOOTING
The ALMEMO ® 710 data logger can be configured and programmed in many
different ways. It is suitable for connecting a wide variety of different sensors,
additional measuring instruments, alarm signaling devices, and peripheral
equipment. Given these numerous possibilities the device may in certain cir-
cumstances not behave quite as expected. The cause of such unexpected be-
havior is only very rarely a device defect; usually the cause is incorrect opera-
tion by the user, an invalid setting, or unsuitable cabling. In such event try to
pinpoint and clear the problem with the aid of the following tests.
Error No display, display malfunction, keys do not react.
Remedy Check the power supply. Charge the batteries. Switch OFF and then
back ON again. If necessary reinitialize. (see 7.5)
Error Measured values are incorrect.
Remedy Check all the channel programming very carefully, especially the
base value and zero-point (menu ´Display´ > ´Channels list´ > ´Mea-
suring channel´ > ´Channel parameters´)
Error Measured values fluctuate unexpectedly or the system hangs in mid-
operation.
Remedy Check the cabling for any inadmissible electrical connections. Unplug
any suspicious sensors. Connect a hand-held sensor in air or a
phantom sensor (for thermocouples short-circuit A-B, for Pt100 sen-
sors use 100 Ω) and check. Connect the sensors again one at a
time and check successively. If a fault persists for any one connec-
tion, check all wiring. If necessary, insulate the sensor and eliminate
interference by using shielded or twisted wiring.
Error Data transmission via the interface does not function.
Remedy Is the USB driver installed correctly? Check the interface module,
connections, and settings. Ensure that both devices are set to the
same baud rate and transmission mode. (see 13.6.2.1) Is the cor-
rect COM port on the computer being addressed ? Test data trans-
mission by means of a terminal (ALMEMO
Address the device using its assigned device number ´Gxy´. (see
Manual 6.2.1) If the computer is in XOFF status. enter <ctrl Q> for
XON. Check the programming by means of ´P15´.
6.2.3F) Test the transmit line only by entering a cycle using com-
mand ´Z123456´ and check in the display. Test the receive line by
pressing the manual key and check in the display.
Error Data transmission in the network does not function.
Remedy Check to ensure that all devices are set to different addresses; then
address devices individually via the terminal with command ´Gxy´.
Addressed device is OK if at least ´y CR LF´ is returned as echo. If
74 ALMEMO ® 710
Control, WinControl).
®
(see Manual