Refrigeration and Air Conditioning Controls Technical Leaflet Monitoring, Control and Alarm System m2 REFRIGERATION AND AIR CONDITIONING
Introduction The m2 has been developed to provide a comprehensive, yet simple-to-use means of monitoring and recording refrigeration temperatures and other aspects of refrigeration plant operation. It is intended for use in small to medium food storage operations (for example a small supermarket) where compliance with the Food Hygiene Regulations is to be demonstrated. A variety of ancillary control equipment may be in use in such installations, each with its own specific requirements in terms of interfacing and monitoring, and m2 can be configured to work in such an environment. Designed for operational simplicity, the system once configured can display the status of each input point in turn with the occurrence of any fault condition indicated immediately by means of audible and visual alarms. Further details on any aspect of the operation of the installation are available via the key pad. In addition there is the ability for authorised personnel to make adjustments to the control and/or monitoring settings. Historical data is stored within the system and may be viewed or printed on a regular basis. The data is accessible both on and off-site via the external modem connection and alarm calls can also be generated if required. An RS232 serial interface via a 9-way D type connector is provided which allows either a directly connected IBM compatible Personal Computer (PC) or a Minitel to be connected for operational and configuration purposes or to allow connection to a modem. If a PC is connected either directly or via the modem, the alarms and monitor readings can be read and the set-up details can be changed remotely. Features Up to 16 input monitoring capacity (expansible to 99 inputs) Supports up to 60 EKC controllers via LonWorks network Supports up to 31 'TX' or 'DX' controllers via third party RS485 network (*) Supports m2+ expansion modules via third party RS485 network Visual and audible alarms with dial-out options for each input Printout of logs and/or graphs provides comprehensive historical records Clear graphical and numerical indication of values Up to one year storage of all data (based on 15 minutes sampling) The m2 provides central defrost initiation scheduling for EKC controllers Mains failure alarm with battery back-up Fail safe operation (*) In addition, a number of other monitoring and control devices (fitted with 'Third Party' protocol) are supported. 2 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 m2
System Overview The m2 consists of a central monitoring unit which can monitor up to 16 local sensors or inputs which are usually located adjacent to the equipment in question for example specific refrigerated areas (chiller cabinets, freezers, cold rooms, plant rooms or gas detectors). In addition, 2 networks can be connected to the unit: one LON bus to accomodate up to 60 EKC controllers (210, 301 & 331) plus one 'TP' bus to support up to 31 'Third Party' controllers. The same 'TP' bus can be populated with m2+ expansion or m2- BBM modules, each accomodating additional temperature sensors or contact inputs. Total system capacity is 99 inputs.the precise layout and configuration of these sensors and controllers is specific to each installation, and it is not necessary for a typical operator to be familiar with the operation of the sensors. Alarms The m2 provides audio and visual alarms whenever an input exceeds its pre-set alarm levels. For night operation, the system can be pre-set to dial-out using a digital dialler or via a modem whenever an alarm occurs. Security Security is provided by having passcode access to the protected settings. In the case of mains failure, an alarm is triggered after a delay. The system can be pre-set to dial-out to an external telephone number if required. The m2 will always FAIL SAFE (except for modem dailout). Battery Backup The unit is provided with battery backup to continue historical logging during a power failure. In this case, the display backlight will switch off but the display will keep running. When an alarm occurs, the alarm siren and the red flashing backlight will still operate. The backlight will flash red, once every 5 seconds until the alarm is muted. Note: When a mains failure lasts longer than 1 hour, the unit will cease historical logging and stop alarm checking. However, all existing system settings and historical readings remain in memory and are not lost. Printing If hard copy details of the monitor readings is required, a parallel printer port is provided which can be connected to an Epson compatible parallel printer. Application Overview Application no. 1 m2 fitted with temperature sensors - NTC or PT1000 m2 Sensor Sensor m2 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 3
Application no. 2 m2 m2 fitted with EKC 201/ 301 & 331 controllers via RS485 LON bus Application no. 3 m2 fitted with 'TX' controllers via 'Third Party' RS485 network Application no. 4 m2 fitted with m2+ expansion units 4 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 m2
Application no. 5 m2 fitted with m2-bbm units Application no. 6 m2 fitted with EKC 201/ 301 & 331 controllers via RS485 LON bus, plus 'TX', 'DX' controllers and m2+ expansion modules fitted via 'Third Party' RS485 network m2 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 5
Technical data Supply voltage 230 V + 10/-15% a.c. 50-60 Hz or 115 V +10/-15% a.c. 50-60 Hz (optional) Display Graphic LCD, 240 x 64 Operation Push buttons on front panel Signal inputs Up to 99 inputs total, consisting of any combination of (16 max.): NTC temperature sensor 1 (16 Max.) PT1000 temperature sensor 1 (16 Max.) Digital contact On/Off (16 Max.) 4-20mA. (16 Max.) PLUS: EKC 201/301/331 controllers (60 Max.) m2+ expansion modules (7 Max.) Third Party controllers (31 Max.) Measuring accuracy with PT1000 sensor Refer to EKC 201/301 data. Data collection 8 Mb Max.Capacity 2 Alarm relay 2 - Load: 24 v a.c. 1A Printer connection Parallel (Epson compatible) Battery backup 1 hour 3 Data communication RS 232 'LON' Bus 'Third Party' RS485 Languages 4 English, German, French, Dutch, Italian, Spanish, Norwegian, Danish, Icelandic, Finnish, Hungarian, Polish, Czech, Swedish, Portuguese. Ambient temperature Transport: -20 to +70 C Operation: 0 to +50 C Humidity: 20-80%RH Enclosure IP 20 1. Only NTC's or PT1000's can be used at a time. 2. The data collection capacity depends on the amount of memory installed in the m2 unit. 3. If a power failure lasts longer than one hour, the monitoring unit will stop the collection of data and the alarm monitoring. Already collected data will remain intact. 4. At time of printing the following languages are yet to be completed: Slovenian & Malaysian. Ordering Model Description PT1000 8 Input Master 2Mb 080Z8167 Code no. Thermistor 16 Input Master 2Mb 080Z8152 080Z8153 16 Input Master 6Mb 080Z8118 080Z8127 Accessories D escription Code no. AKS11 sensor 3.5m cable 084N0003 AKS11 sensor 5.5m cable 084N0005 AKS11 sensor 8.5m cable 084N0008 PT1 Sensor 5m Cable NAP40-572 PT2 Sensor 5m Cable NAP40-517 PT3 Sensor 5m Cable NAP40-050 m2 to Parallel Printer cable 3m OBP50-236 080Z8401 m2 to PC or Modem cable 3m 25-way 'D' OBP50-321 m2 to PC or Modem cable 3m 9-way 'D' OBP50-315 080Z8400 Central Station Software OCSWR5030 m2+ Thermistor* 080Z8004 m2+ PT1000* 080Z8005 6 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 m2
Dimensions and weights Weight: 1.65kg m2 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 7
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved. 8 Technical Leaflet RB.8B.A4.02 Danfoss 6-2002 m2