9. Schaltgerät - Kessel

8. Malfunctions and troubleshootingRelay faultPower contactor no longer switches off--> Disconnect switch unit from the mains--> Replace contactor --> Contact Customer ServicesDuo Pump 1Duo Pump 2Level faultDuo Pump 1/2Level fault (only with pressure diaphragm switch): Control cable to the switch unit is notlaid on a continual gradient--> Check cable route, shorten any excess lengths if appropriate.The switches ON and ALARM switch in the wrong order--> Pressure control unit faulty, replacement necessary8.2.1 Irregular level states (up to 12/09)Malfunctions of level switches can be recognised in part andtrigger a meaningful emergency control in "automatic" operatingmode. If the control unit recognises an implausiblelevel switch state, the malfunction message "level" is indicatedby the red "running time/level" LED flashing and the"malfunction" relay. The malfunction message can be deletedusing the "alarm reset" key when the fault has been remediedor when no level fault can be detected on account ofpending level signals. Generally speaking it is not possibleto distinguish between non-closing "alarm" level switchesand non-opening "on" level switches.Irregular level states usually indicate a fault in the levelswitches or wiring. Maintenance may only be carried outby a qualified electrician.a) Single systemNo distinction can be made between a non-closing "on" levelswitch and a non-opening "alarm" level switch. If "alarm"level is pending without "on" level, a level fault is indicated.The motor is not switched on. If the "on" level switch closesin this state, however, the pump is switched on. Opening the"on" level switch switches the pump off.b) Twin system• Non-closing "on 1" level switchMalfunction message follows the "on 2" level being exceeded.If the "alarm" level is exceeded, both pumps switch on.If the level drops below the "on 2" level, the pumps switch off.• Non-closing "on 2" level switchMalfunction message follows the "alarm" level being exceeded.At the same time, the second pump is switched on. Bothpumps remain in operation until the level falls below "on 1"again.• Permanently closed "on 2" level switchMalfunction message follows the "on 1" level not being reached.One pump switches on when the "on 1" level is exceeded,the second pump when the "alarm" level is exceeded.• Permanently closed "alarm" level switchMalfunction message follows when "alarm" level is indicatedbut at least "on 2" level is not reached. A permanent "alarm"message is then sent. The alarm message via the internalsignal sensor can be deleted by actuating the "alarm reset"key. The "alarm" relay remains active, however, until the faulthas been eliminated. One pump is switched on when the "on1" level is exceeded, the second pump when the "on 2" levelis exceeded. Both pumps are switched off after the level fallsbelow "on 1".70