Installation and Operating Instructions
Contents
1. minutes e Slide switch set to 30 minutes Between ref rigeration periods the agitator motor swit ches on for 2 minutes every 30 minutes IMPORTANT The milk refrigeration thermostat has been adjusted in our factory Please do NOT alter the settings of potentiometers P3 and P4 Status LED BE Key functions Agitator ON Agitator is in operation Compressor ON Compressor is in operation S Display setpoint etp For display of the current Act setpoint _ A two minute agitation period ob can be initiated with this 2 min pushbutton switch sk AUTO The thermostat operates in AUTO AUTO mode CONT The agitator motor operates in continuous mode Cont The compressor remains OFF X a OFF Switch thermostat OFF A A AUTO mode The milk is refrigerated down to the preset temperature 4 8 The agitator motor is running continuously After reaching the preset temperature the compressor switches off Two minutes later the agitator motor switches off Inthe intervals between refrigeration the agi tator motor switches on again for 2 minutes optionally every 15 or 30 minutes in order to ensure a uniform temperature throughout the milk If the milk temperature exceeds the setpoint the compressor and agitator are switched on automatically2. GmbH Electronic Control Engineering Gewerbepark Siebenmorgen 6 D 53547 Breitscheid ches off first followed two minutes later by the agitator Between refrigeration periods the agita tor motor switches on again for 2 minutes optionally every 15 or 30 minutes in order to ensure a uniform temperature throug hout the milk Independently of this the agitator can be switched on for 2 minutes by pushbutton or can be switched to continuous operati on Phone 49 0 2638 9320 0 Fax 49 0 2638 9320 20 E mail info welba de Net www welba de AEE The milk refrigeration thermostat and the in stallations connected to it contain live com ponents When installing the milk refrigeration ther mostat it is ESSENTIAL to comply with the relevant regulations for electrical installati on Only authorized specialist personnel are to be allowed access to the area when connec ted Installation Casing installation By virtue of its construction the milk refrigerati on thermostat can be installed in practically any location e Unscrew the housing cover e Attach the housing base to the wall with four screws Sensor installation For operation of the milk thermostat it is ESS ENTIAL to use the temperature sensor provi ded The sensor lead may be shortened or ex tended Electrical connection 412 3 4 5 6fAq 7 Ag L1 L1 N Sensor 230V 50 Hz Agitator Compressor contactor IMPORTANT Do not ap
3. Technical Data 230 V 50 Hz 60Hz 2 voltage free make contacts 16 AAC 1 each Operating voltage Relay contacts Max switching current Max switching voltage 250 V each Display 3 digit 13 mm LED Display range 9 9 to 99 9 Sensor NTC thermistor 2 2 k Ohm 25 C Measurement range 9 9 to 50 C Target temperature T1 Target temperature T2 Control type Factory set to 8 C Factory set to 4 C 2 step regulator Hysteresis 0 3 K to 2 K adjustable Stirrer resting time interval 15 min 30 min adjustable stirring time 2 min Housing Wall mounted housing BxHxD 80 x 160 x 86 mm screw connection 10 C to 50 C 20 C to 70 C Electrical connection Permissible ambient temperature Storage temperature Special versions on request A ALWAYS CHANGE THE SENSOR WHEN CHANGING THE THERMOSTAT ADJUST SETPOINTS AFTER 5 MINUTES OPERATION by WELBA 10 09 03 Installation and Operating Instructions Electronic Milk Refrigeration Thermostat ETM W200 The ETM W200 is an electronic milk refri geration thermostat with automatic afters tirring control The thermostat has two separately adjus table setpoints which can be selected by means of an internal slide switch The current milk temperature is displayed continuously If the milk temperature exceeds the selec ted setpoint the compressor and agitator are switched on automatically When the setpoint is reached the compressor swit WELBA
4. ply the supply volta ge until agitator compressor and sensor ha ve been connected e Carry out electrical connection in accordan ce with the above circuit diagram e Connect supply voltage 230 V to terminals A1 and A2 Setting by Installation Following settings are only allowed by aut horized personnel Switching point Sp1 Sp2 Zero P1 P2 P3 C ca CA Sp2 A TN H O Sp 1 P4 P5 35 Hyst Intervall 15 Min 30 Min ag VEDIR S Agitator Transformer lt b Connection terminal F Temperature setpoint 1 4 only when other temperature required e Setslide switch to Setpoint 1 e Depress the Setpoint Actual key the cur rent temperature setpoint will be displayed e Adjust potentiometer P1 until the required temperature setpoint appears on the dis play Temperature setpoint 1 4 only when other temperature required e Setslide switch to Setpoint 2 e Depress the Setpoint Actual key the cur rent temperature setpoint will be displayed e Adjust potentiometer P2 until the required temperature setpoint appears on the dis play Hysteresis switching temperature difference Factory preset to 0 7 K e Potentiometer P5 can be used to reduce or increase the hysteresis if required Interval time e Slide switch set to 15 minutes Between ref rigeration periods the agitator motor swit ches on for 2 minutes every 15
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