JULABO LH 50 User Manual

Operating Manual

Highly Dynamic Temperature Control Systems

with integrated programmer

LH 47

air cooled

LH 50

water cooled

Version: V45D-01		JULABO GmbH
		77960 Seelbach / Germany
		Tel.	+49	(0) 7823 / 51-0
		Fax	+49	(0) 7823 / 24 91
		[e-mail]
1.951.2790-V2	06/13	www.julabo.de
19512790-V2.doc			Print date: 29.07.13

Congratulations!

You have made an excellent choice.

JULABO thanks you for the trust you have placed in us.

This operating manual has been designed to help you gain an understanding of the operation and possible applications of our circulators. For optimal utilization of all functions, we recommend that you thoroughly study this manual prior to beginning operation.

Printed in Germany

Changes without prior notification reserved

Important: keep operating manual for future use

The JULABO Quality Management System

Temperature control devices for research and industry are developed, produced, and distributed according to the requirements of ISO 9001 and ISO 14001. Certificate Registration No. 01 100044846

Unpacking and inspecting

Unpack the unit and accessories and inspect them for possible transport damage. Damage should be reported to the responsible carrier, railway, or postal authority, and a damage report should be requested. These instructions must be followed fully for us to guarantee our full support of your claim for protecting against loss from concealed damage. The form required for filing such a claim will be provided by the carrier.

Lift the unit only with a crane (see pictures) using the lifting strands and the wooden crate . The recessed grips on the side are not suited for this purpose!

2

TABLE OF CONTENTS
OPERATING MANUAL .......................................................................................................		5
1.	INTENDED USE....................................................................................................	5
1.1.	Description.............................................................................................................	5
2.	OPERATOR RESPONSIBILITY – SAFETY INSTRUCTIONS ..............................	6
2.1.	Disposal.................................................................................................................	8
2.2.	EC Conformity .......................................................................................................	8
2.3.	Warranty conditions...............................................................................................	9
2.4.	Technical specifications.......................................................................................	10
2.5.	Cooling water connection ....................................................................................	14
OPERATING INSTRUCTIONS .........................................................................................		15
3.	SAFETY NOTES FOR THE USER......................................................................	15
3.1.	Explanation of safety notes .................................................................................	15
3.2.	Explanation of other notes...................................................................................	15
3.3.	Safety instructions ...............................................................................................	15
4.	OPERATING CONTROLS AND FUNCTIONAL ELEMENTS..............................	18
4.1.	The Presto Plus principle with closed external system ........................................	24
5.	PREPARATIONS ................................................................................................	25
5.1.	Bath fluids............................................................................................................	25
5.2.	Tubing..................................................................................................................	27
5.3.	Installation ...........................................................................................................	28
5.4.	Connect the external system ...............................................................................	28
5.5.	Cooling water connection LH 50..........................................................................	30
5.6.	Power connection ................................................................................................	31
5.7.	Filling ...................................................................................................................	31
5.7.1.	Filling of external, closed systems................................................................	32
5.8.	Degasifying..........................................................................................................	34
5.9.	Draining ...............................................................................................................	35
6.	OPERATING PROCEDURES .............................................................................	36
6.1.	Switching on / Selecting the language.................................................................	36
7.	MANUAL OPERATION........................................................................................	37
7.1.	Start - Stop ..........................................................................................................	37
7.2.	Direct setting of the working temperature............................................................	38
7.3.	Settings in the SET menu....................................................................................	38
7.3.1.	Setting the working temperature...................................................................	38
7.3.2.	Warning functions.........................................................................................	39
7.3.3.	Setting the pump pressure stage..................................................................	40
7.4.	Setting the safety temperature (with shutdown function).....................................	40

3

7.5.	Internal / external control.....................................................................................	42
8.	MENU FUNCTIONS ............................................................................................	42
8.1.	Configuration .......................................................................................................	44
8.2.	Control parameters..............................................................................................	47
8.3.	Start of a profile ...................................................................................................	49
8.3.1.	Interrupting a profile......................................................................................	51
8.4.	Integrated programmer........................................................................................	52
8.5.	Analog inputs/outputs..........................................................................................	55
8.6.	Limits ...................................................................................................................	58
8.7.	Interface...............................................................................................................	58
8.8.	Sensors ...............................................................................................................	59
8.9.	Pump ...................................................................................................................	60
9.	TROUBLESHOOTING GUIDE / ERROR MESSAGES .......................................	61
10.	ELECTRICAL CONNECTIONS...........................................................................	63
11.	REMOTE CONTROL...........................................................................................	66
11.1.	Setup for remote control ......................................................................................	66
11.2.	Communication with a PC or a superordinated data system...............................	67
11.3.	List of commands ................................................................................................	68
11.4.	Status messages / error messages .....................................................................	71
12.	CLEANING THE UNIT.........................................................................................	72
13.	MAINTAINING / REPAIRING THE UNIT.............................................................	75

4

Operating manual

1.Intended use

JULABO Temperature Systems have been designed for temperature application to specific fluids in a external closed system (oop circuit). The units feature pump connections for temperature control of external systems (loop circuit).

JULABO circulators are not suitable for direct temperature control of foods, semi-luxury foods and tobacco, or pharmaceutical and medical products. Direct temperature control means unprotected contact of the object with the bath medium (bath fluid).

1.1.Description

Besides the cooling unit, the main functional elements are the heater, circulation pump and control electronics. Via an external Pt100 control sensor, a self-optimizing, electronic proportional temperature control (PID characteristic) adapts the heat supplied to the thermal requirements of the external system.

The high pump capacity can be reduced by regulating the motor speed in five grades. It may thus be adapted to sensitive vessels.

LH47: The cooling unit may be cooled with air. LH50: The cooling unit may be cooled with water.

Setting is rapid and simple using the splash-proof keypads. The operating elements consist of the local operating board with a bright VFD-Info-Display, as well as the removable control module RD connected with a cable.

The microprocessor technology allows four temperature values to be stored and indicated on the DIALOG-DISPLAY (LCD) of the control module RD: working temperature, high and low temperature warning limits as well as pump pressure stage.

The digital RS232 / RS485 port permits modern process engineering without additional interface.

The excess temperature protection (safety temperature), a safety feature functioning independent of the regulator circuit, is adjusted and indicated via the VFD-Info-Display.

The integrated programmer allows programming of setpoint and time values for six temperature profiles.

The following analog sockets are available:

- The REG+E-PROG socket for setpoint selection via an external, analog programmer. At the same time, this socket provides three analog outputs for temperature recorders.

- The external Pt100 socket for external control. - The alarm output for an external signal.

- The stand-by input for external emergency switch-off.

5

Operator responsibility – Safety instructions

2.Operator responsibility – Safety instructions

The products of JULABO ensure safe operation when installed, operated, and maintained according to common safety regulations. This section explains the potential dangers that may arise when operating the circulator and also specifies the most important safety precautions to preclude these dangers as far as possible.

The operator is responsible for the qualification of the personnel operating the units.

The personnel operating the units should be regularly instructed about the dangers involved with their job activities as well as measures to avert these dangers.

Make sure all persons tasked with operating, installing, and maintaining the unit have read and understand the safety information and operating instructions.

When using hazardous materials or materials that could become hazardous, the circulator may be operated only by persons who are absolutely familiar with these materials and the unit. These persons must be fully aware of possible risks.

If you have any questions concerning the operation of your unit or the information in this manual, please contact us!

Contact:	JULABO GmbH	Tel.	+49 (0) 7823	/ 51-0	[e-mail]
	Eisenbahnstraße 45	Fax	+49 (0) 7823	/ 24 91	www.julabo.de
	77960 Seelbach / Germany

Safety instructions for the operator:

Avoid strikes to the housing, vibrations, damage to the operating-element panel (keypad, display), and contamination.

Make sure the product is checked for proper condition regularly (depending on the conditions of use). Regularly check (at least every 2 years) the proper condition of the mandatory, warning, prohibition and safety labels.

Make sure that the mains power supply has low impedance to avoid any negative effects on the instruments being operated on the same mains.

This unit is designed for operation in a controlled electromagnetic environment. This means that transmitting devices (e.g., cellular phones) should not be used in the immediate vicinity.

Magnetic radiation may affect other devices with components sensitive to magnetic fields (e.g., monitors). We recommend maintaining a minimum distance of 1 m.

Permissible ambient temperature: max. 40 °C, min. 5 °C.

Permissible relative humidity: 50 % (40 °C).

Do not store the unit in an aggressive atmosphere. Protect the unit from contamination.

Do not expose the unit to sunlight.

Appropriate operation

Only qualified personnel is authorized to configure, install, maintain, or repair the unit.

Persons who operate the circulator must be trained in the particular tasks by qualified personnel. The summarized user guidance (short manual) and the specification table with information on individual parameters are sufficient for this.

6

Use

The bath can be filled with flammable materials. Fire hazard!

There might be chemical dangers depending on the bath medium used.

Observe all warnings for the used materials (bath fluids) and the respective instructions (safety data sheets).

Insufficient ventilation may result in the formation of explosive mixtures. Only use the unit in well ventilated areas.

Only use recommended materials (bath fluids). Do not use poisonous, vitriolic or corrosive bath fluids..

When using hazardous materials or materials that could become hazardous, the operator must affix the enclosed safety labels (1 + 2) to the front of the unit so they are highly visible:

1	Warning label W00: Colors: yellow, black
	Danger area. Attention! Observe instructions.
	(operating manual, safety data sheet)
2	Mandatory label M018:	Colors: blue, white
	Carefully read the user information prior to beginning operation.
or	Scope: EU
2	Semi S1-0701 Table A1-2 #9
	Carefully read the user information prior to beginning operation.
	Scope: USA, NAFTA

Particular care and attention is necessary because of the wide operating range.

There are thermal dangers: Burn, scald, hot steam, hot parts and surfaces that can be touched. Warning label W26: Colors: yellow, black

Hot surface warning.

(The label is put on by JULABO)

Observe the instructions in the manuals for instruments of a different make that you connect to the circulator, particularly the corresponding safety instructions. Also observe the pin assignment of plugs and technical specifications of the products.

7

Operator responsibility – Safety instructions

2.1.Disposal

The product may be used with oil as bath fluid. These oils fully or partially consist of mineral oil or synthetic oil. For disposal, follow the instructions in the material safety data sheets.

This unit contains the refrigerants R-404A and R-23, which at this time are not considered harmful to the ozone layer. However, over the long operating period of the unit, disposal rules may change. Therefore, only qualified personnel should handle the disposal.

Valid in EU countries

See the current official journal of the European Union – WEEE directive. Directive of the European Parliament and of the Council on waste electrical and electronic equipment (WEEE).

This directive requires electrical and electronic equipment marked with a crossedout trash can to be disposed of separately in an environmentally friendly manner. Contact an authorized waste management company in your country.

Disposal with household waste (unsorted waste) or similar collections of municipal waste is not permitted!

2.2.EC Conformity

The products described in the operating instructions conform to the requirements of the following European guidelines:

Directive of the European Parliament and of the Council on the approximation of the laws of the Member States relating to machinery.

Low voltage regulations with respect to legal harmonization of the member countries concerning electric devices for use within certain voltage limits.

EMC guideline with respect to legal harmonization of the member countries concerning electromagnetic compatibility.

JULABO GmbH

Eisenbahnstr. 45

77960 Seelbach / Germany

8

2.3.Warranty conditions

JULABO GmbH warrants its products against defects in material or in workmanship, when used under appropriate conditions and in accordance with appropriate operating instructions

for a period of ONE YEAR.

Extension of the warranty period – free of charge

With the ‘1PLUS warranty’ the user receives a free of charge extension to the warranty of up to 24 months, limited to a maximum of 10 000 working hours.

To apply for this extended warranty the user must register the unit on the JULABO web site www.julabo.de, indicating the serial no. The extended warranty will apply from the date of JULABO GmbH’s original invoice.

JULABO GmbH reserves the right to decide the validity of any warranty claim. In case of faults arising either due to faulty materials or workmanship, parts will be repaired or replaced free of charge, or a new replacement unit will be supplied.

Any other compensation claims are excluded from this guarantee.

9

Operator responsibility – Safety instructions

2.4.Technical specifications

								LH 47									LH 50
Mains power connection						V /		360-440 V/3PNPE/50 Hz									360-440 V/3PNPE/50 Hz
				400 V/3P/50 Hz		Hz
Current input				(at 230 V)		A		12									20
Working temperature range						°C		-47 ... 250									-50 ... 250
Temperature stability						K	±0.01 ... ±0.05							±0.01 ... ±0.05
Cooling capacity						°C	200 100// 20				0 -20 -40			200 //				20	0	-20	-40
pump pressure stage 1						kW	3.7		3.1 // 3.07		2.0	0.99	0.27	5.5 //				7.3	4.6	2.3	0.45
pump pressure stage 5						kW	3.5		3.0 // 2.9		1.9	0.90	0.07	5.5 //				7.2	5.1	2.3	0.19
(bath liquid: Thermal / Ethanol)
Cooling compressor							1-stage										1-stage
								air-cooled									water-cooled
Refrigerant								R404A									R404A
Cooling water : Flow rate						l/h	-----							390
at 20 °C inlet temperature
Heater capacity						kW		1.8									6.0
Pressure pump, adjustable						grade	1		2	3		4	5
pressure min ... max. at 0 liter						bar	0.5		0.7	1.1		1.3	1.7
discharge, max. at 0 bar						l/min	16		19	23		26	30
Pressure pump, adjustable						grade								1				2	3		4	5
pressure min ... max. at 0 liter						bar								0.7				0.9	1.4		1.8	2.3
discharge, max. at 0 bar						l/min								17 19 24 27 31
								Viscosity, max. 50 mm²/s (50 cSt)
Noise level, 1 m distance						dBA		72							-----
Ambient temperature						°C	5 ... 40							5 ... 40
Filling volume				Heat exchanger		liters	2.5								10
				Reservoir		liters		3.2 … 8.4									3.2 … 8.4
Overall dimensions (WxDxH)						cm		40x55x127									40x55x127
Weight						kg		150							182
All measurements have been carried out at: rated voltage and frequency
ambient temperature: 20 °C						Technical changes without prior notification reserved.

Pump data in relation to fluids with a specific density of 1 kg/dm3

10

								LH 47							LH 50
Mains power connection						V / Hz		207-253 V/3PPE/60 Hz							207-253 V/3PPE/60 Hz
				230 V/3P/60 Hz
Current input				(at 230 V)		A		13							27
Working temperature range						°C		-47 ... 250							-50 ... 250
Temperature stability						K	±0.01 ... ±0.05							±0.01 ... ±0.05
Cooling capacity						°C	200 100// 20				0	-20	-40	200 //		20	0	-20	-40
pump pressure stage 1						kW	3.8		3.3 // 3.2		2.1	1.1	0.32	5.5 //		7.3	4.9	2.6	0.5
pump pressure stage 5						kW	3.7		3.2 // 3.1		2.0	1.0	0.12	5.5 //		7.2	4.6	2.1	0.4
(bath liquid: Thermal / Ethanol)
Cooling compressor							1-stage								1-stage
								air-cooled							water-cooled
Refrigerant								R404A							R404A
Cooling water : Flow rate						l/h	-----							330
at 20 °C inlet temperature
Heater capacity						kW		1.8							6.0
Pressure pump, adjustable						grade	1		2	3		4	5
pressure min ... max. at 0 liter						bar	0.5		0.7	1.1		1.3	1.7
discharge, max. at 0 bar						l/min	16		19	23		26	30
Pressure pump, adjustable						grade								1		2	3	4	5
pressure min ... max. at 0 liter						bar								0.7		0.9	1.4	1.8 2.3
discharge, max. at 0 bar						l/min								17 19 24 27 31
								Viscosity, max. 50 mm²/s (50 cSt)
Noise level, 1 m distance						dBA		72						-----
Ambient temperature						°C	5 ... 40							5 ... 40
Filling volume				Heat exchanger		liters	2.5							10
				Reservoir		liters		3.2 … 8.4							3.2 … 8.4
Overall dimensions (WxDxH)						cm		40x55x127							40x55x127
Weight						kg		150						182
All measurements have been carried out at: rated voltage and frequency
ambient temperature: 20 °C						Technical changes without prior notification reserved.

Pump data in relation to fluids with a specific density of 1 kg/dm3

11

Operator responsibility – Safety instructions

Temperature selection		digital
via Removable control module RD		indication on DIALOG-Display (LCD)
remote control via personal computer		indication on monitor
Temperature indication		VFD-Info-Display
		DIALOG-DISPLAY (LCD)
Resolution	K	0.01 from -9.99 °C to +249.99 °C
Pump pressure display		on VFD-Info-Display in five grades
Liquid level display		on VFD-Info-Display in five grades
Absolute Temperature Calibration
(ATC1)	K	±3
(ATC2)	K	±9
Temperature control		ICC - Intelligent Cascade Control, self-optimizing
		Cascade, parameter can be called-in and modified
Working temperature sensor		Pt 100
Safety temperature sensor		Pt 100

Electrical connections:
Computer interface	RS232 or RS485
Programmer input -100 °C to 400 °C =	0 to 10 V or 0 to 20 mA or 4 to 20 mA
Temperature recorder outputs	0 to 10 V (0 V = -100 °C, 10 V = 400 °C)
	0 to 20 mA (0 mA = -100 °C, 20 mA = 400 °C)
	4 to 20 mA (4 mA = -100 °C, 20 mA = 400 °C)
Stand-by input
External alarm device	24-0 V DC / max. 25 mA
External measurement and control sensor	Pt100, 4-lead technique
Control connector (10) Output voltage:	230 V / max. 0.1 A
S a f e t y i n s t a l l a t i o n s a c c o r d i n g t o I E C 6 1 0 1 0 - 2 - 0 1 0 :
Excess temperature protection >TANK<	adjustable from 0 °C ... 320 °C
Excess temperature protection >RES<	adjustable from 0 °C ... 220 °C
Low level protection	float switch
Liquid level display	optical, 5-graded
Classification according to DIN 12876-1	class III FL
Supplementary safety installations
High temperature warning function	optical + audible (in intervals)
Low temperature warning function	optical + audible (in intervals)
Supervision of the working sensor	plausibility control
Reciprocal sensor monitoring between
working and safety sensors	difference >50 K
Alarm indication	optical + audible (permanent)

12

E n v i r o n m e n t a l c o n d i t i o n s a c c o r d i n g t o I E C 6 1 0 1 0 - 1 :

Use only indoor.

Altitude up to 2000 m - normal zero.

Ambient temperature: see Technical specifications

Air humidity:

Max. rel. humidity 80 % for temperatures up to +31 °C,

linear decrease down to 50 % relative humidity at a temperature of +40 °C

Max. mains fluctuations of ±10 % are permissible.

Overvoltage category II

Pollution degree 2

Caution:

The unit is not suitable for use in explosive atmosphere

Protection class according to IEC 60 529: IP31

The unit corresponds to Class I

Standards for interference resistance according to EN 61326-1

This unit is an ISM device classified in Group 1 (using high frequency for internal purposes) Class A (industrial and commercial range).

13

Operator responsibility – Safety instructions

2.5.Cooling water connection

Cooling water pressure (IN / OUT )		max.	6 bar
Difference pressure (IN - OUT )			3.5 to 6 bar
Cooling water temperature			<20 °C
Notice:	Cooling water circuit

Risk of oil leaking from the refrigeration system (compressor) of the recirculating cooler into the cooling water in case of a fault in the cooling water circuit! Observe the laws and regulations of the water distribution company valid in the location where the unit is operated.

Notice:

Danger of corrosion of heat exchanger due to unsuitable quality of cooling water.

Due to its high content of lime, hard water is not suitable for cooling and causes scale in the heat exchanger.

Ferrous water or water containing ferrous particles will cause formation of rust even in heat exchangers made of stainless steel.

Chlorinated water will cause pitting corrosion in heat exchangers made of stainless steel.

Due to their corrosive characteristics, distilled water and deionized water are unsuitable and will cause corrosion of the bath.

Due to its corrosive characteristics, sea water is not suitable.

Due to its microbiological (bacterial) components, which settle in the heat exchanger, untreated and unpurified river water and water from cooling towers is unsuitable.

Avoid particulate matter in cooling water.

Avoid putrid water.

Recommended quality of cooling water:

pH	7.5 to 9.0
Sulfate [SO4 2- ]	< 100 ppm
Hydrocarbonate [HCO 3-]/sulfate [SO4 2-]	> 1 ppm
Hardness [Ca 2+, Mg 2+]/[HCO 3-]	> 0.5 dH
Alkalinity	60 ppm < [HCO 3-] < 300 ppm
Conductivity	< 500 μS/cm
Chloride (Cl -)	< 50 ppm
Phosphate (PO4 3-)	< 2 ppm
Ammonia (NH3)	< 0.5 ppm
Free chlorine	< 0.5 ppm
Trivalent iron ions (Fe 3+)	< 0.5 ppm
Manganese ions (Mn 2+)	< 0.05 ppm
Carbon dioxide (CO2)	< 10 ppm
Hydrogen sulfide (H2S)	< 50 ppm
Content of oxygen	< 0.1 ppm
Algae growth	impermissible
Suspended solids	impermissible

14

Operating instructions

3.Safety notes for the user

3.1.Explanation of safety notes

In addition to the safety warnings listed above, warnings are posted throughout the manual. These warnings are designated by an exclamation mark inside an equilateral triangle. “Warning of a dangerous situation (Attention! Please follow the documentation).”

The danger is classified using a signal word. Read and follow these important instructions.

Warning:

Describes a possibly highly dangerous situation. If these instructions are not followed, serious injury and danger to life could result.

Caution:

Describes a possibly dangerous situation. If this is not avoided, slight or minor injuries could result. A warning of possible property damage may also be contained in the text.

Notice:

Describes a possibly harmful situation. If this is not avoided, the product or anything in its surroundings can be damaged.

3.2.Explanation of other notes

Note!

Draws attention to something special.

Important!

Indicates usage tips and other useful information.

3.3.Safety instructions

Follow the safety recommendations to prevent damage to persons or property. Further, the valid safety instructions for working places must be followed.

Only connect the unit to a power socket with earthing contact (PE – protective earth)!

The power supply plug serves as safe disconnecting device from the line and must be always freely accessible.

Place the instrument on an even surface on a pad made of non-inflammable material.

Do not stay in the area below the unit.

Make sure you read and understand all instructions and safety precautions listed in this manual before installing or operating your unit.

Set the safety temperature.

Never operate the unit without bath fluid in the bath.

15

Safety notes for the user

Pay attention to the thermal expansion of bath oil during heating to avoid overflowing of the fluid.

Prevent water from penetrating into the hot bath oil.

Do not drain the bath fluid while it is hot!

Check the temperature of the bath fluid prior to draining (by switching the unit on for a short moment for example).

Employ suitable connecting tubing.

Avoid sharp bends in the tubing, and maintain a sufficient distance from surrounding walls.

Make sure that the tubing is securely attached.

Regularly check the tubing for material defects (e.g. for cracks).

Never operate damaged or leaking equipment.

Always turn off the unit and disconnect the mains cable from the power source before performing any service or maintenance procedures, or before moving the unit.

Always turn off the unit and disconnect the mains cable from the power source before cleaning the unit.

Always empty the bath before moving the unit.

Transport the unit with care.

Sudden jolts or drops may cause damages in the interior of the unit.

Observe all warning labels.

Never remove warning labels.

Never operate equipment with damaged mains power cables.

Repairs are to be carried out only by qualified service personnel.

Some parts of the bath cover and the pump connections may become extremely warm during continuous operation. Therefore, exercise particular caution when touching these parts.

Caution:

The temperature controlling i.e. of fluids in a reactor constitutes normal temperature system practice.

We do not know which substances are contained within these vessels. Many substances are:

inflammable, easily ignited or explosive

hazardous to health

environmentally unsafe

i.e.: dangerous

The user alone is responsible for the handling of these substances!

16

The following questions shall help to recognize possible dangers and to reduce the risks to a minimum.

Are all tubes and electrical cables connected and installed? Note:

sharp edges, hot surfaces in operation, moving machine parts, etc.

Do dangerous steams or gases arise when heating? Is an exhaust needed when working?

What to do when a dangerous substance was spilled on or in the unit? Before starting to work, obtain information concerning the substance and determine the method of decontamination.

Caution:

Escape of vapors / gas

The necessity of degassing requires that a closed system is not entirely sealed. Especially at increased working temperatures vapor / gas may escape.

Ensure sufficient ventilation at the place of installation!

Notice:

When you have finished the application, it is recommended to keep on circulating the liquid in the bath or the external system for some time. Simultaneously set the working temperature to +20 °C to allow the temperature in the system to decrease slowly.

Thus fractional over-heating of the bath liquid is prevented.

Notice:

Please check the safety device from time to time.

Excess temperature protection according to IEC 61010-2-010

With a screw driver turn back the adjustable excess temperature protection until the shut-down point (actual temperature).

Low level protection

To check the function of the float of this unit it cannot be operated manually. The 5-graded level display should therefore be observed whenever refilling. If the bath liquid thickens or cracks, the instrument should be cleaned and checked by qualified personnel.

17

Operating controls and functional elements

4.Operating controls and functional elements

Front view

LH47

LH50

air-cooled

water-cooled

18

1

2

3

4

5

6

Mains power switch, illuminated

Local operating board

Socket board - description see page 20

Removable control module RD

Filling funnel (hinged)

	Motor protection circuit breaker for compressor motor
1

0

2 Mains circuit breakers (resettable) 10 A for the pump-motor 4 Mains circuit breakers (resettable) 16 A

7	Venting grid, removable
8	Drain with drain port
2	Local operating board
2.1	VFD-Info-Display
	Header: Control indicators see section 2.2
	Line 1:	Actual value	Int or Ext
		To swap, press the key		(see below)
	Line 2:	Working temp. setpoint, constantly S xxx.xx
	or	indication of the safety temperature (TANK)
	Line 3:	Miscellaneous values
		To swap, press the key		(see below)
	or	indication of the safety temperature (RES)
2.2	Control indicators in the header:
	Heating / Cooling / Alarm / Remote control
	Temperature indication Internal or External actual value
	Temperature indication in °C or °F
	Display for the adjusted pump pressure stage (five grades),
	adjustable via the key .

Liquid level display (five grades) for the reservoir.

19

Operating controls and functional elements

2.3

2.4

Int

2.5

2.6

2.7

Key to swap line 3 on the VFD

ID	xx	Identification no. of control module RD
L	xx	Capacity in %

E xxx.xx or I xxx.xx Actual value (external or internal)

P x.xx

Pump pressure in bar

Key to swap line 1 on the VFD

Actual value Int or Ext alternating with line 3

Key to indicate the safety temperature on the VFD

Line 2: TANK - Safety temperature in internal bath Line 3: RES - Safety temperature in internal reservoir

Adjustable excess temperature protection (safety temperature) Used for setting the safety temperature in the internal bath, called "TANK" on the display

Adjustable safety temperature.

Used for setting the safety temperature in the internal reservoir, called "RES" on the display

2.8

3	Socket board
3.1

REG+E-PROG

3.2

STAND-BY

3.3

ALARM

3.4

EXT. Pt100

3.5 SERIAL

3.6

RD

Key for automatic filling and air purge of the unit as well as the connected external system.

Programmer input and temperature recorder output

Stand-by input (for external emergency switch-off)

Alarm output (for external alarm signal)

Connector for external measurement and control sensor

Interface RS232/RS485

Connector: control cable of control module RD

20

4

4.0

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

Control module RD

Setp: 120.00°C

IntAct 21.00°C

ExtAct: 20.00°C

Control: Intern

>Setp.: 120.00°C Overt.:255.00°C Subtmp:-55.00°C St.Pump: 2

>Configuration Control param. Profile Start Int. Programmer

DIALOG-DISPLAY (LCD)		Standard indication
Line 1:	Setpoint	in °C
Line 2:	Internal actual value	in °C
Line 3:	External actual value	in °C
Line 4:	Control type: internal / external control
	Indicating messages (e. g. warnings)

Start / stop key

To switch the circulation pump, heating element and cooling unit.

SET Menu Key - Indicating and setting setpoint values

Set the following values:		Setp.:
in Line 1:	the working temperature
Line 2:	the high temperature limit	Overt.:
Line 3:	the low temperature limit	Subtmp:
Line 4:	the pump pressure stage	St.Pump:

Control type: internal / external control

To swap, the unit has to be in the STOP MODE. Indicated in line 4 on the DIALOG-DISPLAY (LCD)

MENU key - for selecting the menu functions (Menu see page 42)

Cursor keys - Select menu items

P-key	Selecting parameters
Escape key		1)	Cancel entries
		2)	Return to a higher menu level
Enter key		1)	Store value / parameter
		2)	Next lower menu level

Numeric keypad: numerals 0 to 9; minus / decimal point

....

21

Operating controls and functional elements

Rear

22

10							Control connector
							230 V / max. 0.1 A

11	Si1	Si3	4 Mains circuit breakers (resettable) 16 A
	16	16
	A	A	F1 and F3  Compressor
	M	M
	P	P	F2 and F4 Heater, Pump
	A	A
	16	16
	M	M
	P	P
	Si2	Si4

11a
	1
	0

12

13 + 14

15

Motor protection circuit breaker for compressor motor

Mains power cable with plug

Pump connectors	Return	Feed	M16x1
Overflow connector	M16x1

16			Connector for expansion vessel		M16x1
17 + 18			Cooling water connectors LH41		G3/4" external thread
			IN - inlet	OUT - outlet
			Castor without brake (at the back)
19
19a			Castor with brake (at the front)

23