Condair UDC - Page 12

12 Condair UDC
1.8.2 General operation
1.8.2.1 Idle Display
• The idle display is activated when no key has been pressed for 30 seconds.
• The idle display can be deactivated by the technician. Last active control loop or manual output will
remain displayed.
1.8.2.2 Display of control loop
• Active when changing set points. Large digits show input value. Small digits show set point. Horizontal
bars top left show which loop is being displayed.
1.8.2.3 Override of secondary set point in cascade control
• With cascade control, manual override of the secondary circuit can be activated. This is dened by
the technician in the controller settings.
• If cascade control is active (with VAV for example) the user can override the primary loop and manually
select the set point of the secondary loop (the loop is then changed to constant air volume mode).
This function is helpful for tuning the VAV system. While the secondary loop is displayed change the
set point with <UP>/<DOWN> button. The hand symbol appears. Change setpoint again to cancel
cascade override. The hand symbol disappears.
1.8.2.4 Manual Mode
• The hand symbol is displayed during a pending delay. For example, if a start-up delay is active. The
controller remains switched off and displays the hand symbol until the delay has elapsed. Then the
controller switches on and the hand symbol goes out.
1.8.2.5 Status-LED
• A status LED is located on the upper left side of the controller housing. During normal operation the
LED blinks briey once every 5 seconds. It will blink every second in case there is an alarm or fault
condition.
1.8.2.6 Power Failure
• All parameters and set points are memorized and do not need to be re-entered. The switch-on be-
havior on return of the power supply is set by the technician.
• Clock and time schedule settings are retained for 48 hours after being powered for at least 10 hours.
1.8.2.7 Error Messages
Err1: Communication error
Err2: Internal error: Firmware version of the memory does not match rmware.
Err3: Timer error: Set time and acknowledge error. If an error occurs again at a previously set time,
the watch is faulty. Time switching functions are not guaranteed in this case.
Err4: Conguration error: An assigned input is not activated or has failed. Check all settings and ensure
that all inputs used are activated and functional.
Err5: Copy error: Communication error with external memory AEC-PM1 or AEC-PM2.
Err6: Copy error: Checksums of the data record are incorrect. The data record is invalid.