HYDAC EDS 601 User Manual
Page 11
For safety purposes, there are several means of recognising data errors in both
types of memory. The data in the EEPROM is checked during every read and
write operation, the data in the RAM is monitored cyclically. In environments of
strong electro-magnetic fields or when there are extreme surges in the supply
voltage, a data error can occur. However, if lots of errors occur external anti-
interference measures must be taken. In individual cases, there may also be a
fault in the pressure switch.
To guarantee reliable operation, in cases of error a corresponding message is
displayed and the relays and the analogue output are switched off until the error
is acknowledged by pressing any key.
ER 10
An error was discovered when the EEPROM was used. Switch the
unit off and on again. If error 10 still appears when the unit is
switched back on the data in the EEPROM is invalid. Please check
all settings (measuring range, basic settings, switching points,
calibration) and correct them if necessary. Then check whether the
settings are saved if the unit receives no supply voltage or if an error
message is still displayed when the unit is switched off and on again.
ER 11
Errors were discovered in the RAM. Please take appropriate anti-
interference measures to guarantee reliable operation.
ER 12
The calibration data has been lost. Until the unit is re-calibrated this
error will be displayed every time the unit is switched on.
Invalid operating conditions
The displays listed below are not error messages which need to be
acknowledged. As soon as the valid operating condition re-occurs the unit
operates normally.
l
The display "- - - - means that the supply voltage has fallen so low that a
reliable operation of the pressure switch is no longer guaranteed. (see
chapter 2.4.). The relays and the analogue signal have been switched off.
l
The display "U.P. (under pressure) means that the pressure in the system
is too low.
l
The display "O.P. (over pressure) means that the measuring range of the
pressure switch has been exceeded so much that the pressure can no
longer be correctly measured.
4.3.
E