Danfoss DHP-R 7Ua User Manual Download

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VU*'+102

user’s manual

COnTrOl sYsTem

DHP-r&DP

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Summary of Contents for DHP-R 7Ua

Page 1: ...VU 102 user s manual CONTROL SYSTEM DHP R ...

Page 2: ...VU 102 2 Danfoss ...

Page 3: ...nformation 21 3 6 Settings 21 3 6 1 Heat pump 21 3 6 2 Heating 23 3 6 3 Extra heater 24 3 6 4 Heat stop 24 3 6 5 Brine control 25 3 6 6 Hot water 25 3 6 7 WCS 26 3 6 8 TWC 26 3 6 9 Shunt groups 27 3 6 10 Cooling 27 3 6 11 Manual override 29 3 7 Expansion modules 29 3 7 1 Slave pumps 30 3 7 2 WCS TWC and Cooling 30 3 7 3 Shunt groups 30 3 8 System settings 30 3 8 1 Serial number 30 3 8 2 Menu navig...

Page 4: ... 76 4 Danfoss ...

Page 5: ...re An outdoor temperature sensor a primary supply temperature sensor and the system primary circulation pump are all connected to the mas ter control system The master can also control auxiliary heating which may be electrical district heating or oil or another kind of burner WM HPC has an operator panel on the front of the heat pump where the user can see and change settings alarms temperature se...

Page 6: ... 76 6 Danfoss ...

Page 7: ...perature is looked up in a curve This curve must be adjusted to fit the tem perature needs of the specific building it is to control The temperature that is looked up is used as a set point for the integral control 2 1 2 Integral control The integral control decides whether the heat pump or several heat pumps should run and also if the auxiliary heater is needed A heat pump can only be either on o...

Page 8: ... multiple heat pumps If all the heat pumps are running but the integral still drops then the auxiliary heater is needed Start extra heater decides how much below the starting va lue for the last heat pump the integral must drop before the auxiliary heater is started When it has dropped to the limit Full extra heater below the start limit or the last heat pump the auxiliary heater will work at maxi...

Page 9: ...r The heater is started when the integral passes the limit for starting the auxiliary heater and is tur ned of when it rises above the limit for starting the last heat pump When the heater is started it is controlled not only by the integral but also by the controller error If the difference between the primary supply temperature and the set point is greater than the value Turn off limit the heate...

Page 10: ...ain circulation pump to stand still for a long time There is therefore a pump exercise function Once every day the circulation pump is started and run for one minute The pump exercise times can be adjusted The auxiliary heater can be blocked earlier at lower temperatures There is a separate outdoor temperature limit and hysteresis for blocking the auxiliary heating but without the time limits 2 1 ...

Page 11: ...ction to start as the integral starts at zero In order to speed up the heating after a restart it is possible to activate forced start conditions If the primary supply temperature falls more than Lim force hp start degrees below the set point the integral is forced to the starting value for the first heat pump unless that limit has already been passed If the controller error falls below Lim force ...

Page 12: ...e ope rating pressure switch is activated When a heat pump stops producing hot water it will instead produce heat for the building if there is a demand for heat 2 2 4 Top Up function Before hot water production is turned off theTop Up function performs a check to see whether it can top up the hot water first If the hot water temperature is lower thanTopuptemplimitdegreesoverthestartlimitStartlimit...

Page 13: ... if heater seldom reaches high tem peratures in normal operation 2 3 Heat pump restrictions 2 3 1 Time restrictions The heat pump has two time conditions that must be met if it is to be allowed to start One states that when stopped it must be standing still for at least five minutes before it can start again The other states that any two starts must be at least 20 minutes apart This time limit can...

Page 14: ...one circulation pump and one shunt valve and measure one temperature The purpose of the shunt module is to control the measured tem perature using the shunt valve The functiona lity can be configured for the cases described below The controller is a PI controller An alarm is ge nerated if the controller error exceeds a setta ble limit 2 4 1 Outdoor compensated curve If the outdoor compensated curv...

Page 15: ...th a cooling system the cold side of the heat pumps are used to generate comfort cooling or cooling for other purposes To control a cooling system the module HPC CM is used 2 5 1 Cooling tank and integral control A cooling tank is used to store chill water The temperature in the tank is me asured and compared to a set point The difference is integrated and just as for heat production the cooling i...

Page 16: ...on and disconnect the bore hole The brine will then circulate only through the cooling tank and the heat pumps so that maximum heat is removed from the cooling tank 2 5 2 Surplus heat dumping The heat produced when a heat pump is started for cooling is as a first option used to make hot water or to warm the building if such demands exist When these demands are met the heat has to be dumped This ca...

Page 17: ...temperature and relative humidity When connected the dew point con trol can be activated The control system will then calculate the dew point and if necessary raise the cooling circuit set point to avoid condensation 2 5 4 Blocking cooling The cooling circuit can be blocked by low outdoor temperature A tempera ture limit with hysteresis blocks the use of active cooling Another limit blocks passive...

Page 18: ... 76 18 Danfoss ...

Page 19: ...from a menu and to abort editing without saving the value The red alarm LED is lit when an alarm is active If there are alarm that needs to be acknowledged the LED will blink When the operator panel is started it first runs a boot loader software This software waits until it can communicate with the control system and checks if the main program needs to be updated During this time the red LED will...

Page 20: ...el press escape 3 3 Alarms The menu Active alarms shows all the alarms that are currently active if there are any The alarms monitor the occurrence of errors Some alarms indicate se rious malfunctions that may cause the heat pump to be damaged or disabled These alarms are classified as A alarms and the heat pump cannot run as long as an A alarm is active Other alarms are classified as B alarms whi...

Page 21: ... the heat pump and the rest of the system Under Running time run time information is found Under Databases the values stored in databases are listed First select one ca tegory and press Ok then select a value Press Ok to display a graphical plot showing how the value has changed in recent time The seconds category con tains values that changes fast like shunt signals The last 20 minutes of history...

Page 22: ...ting activates and inactivates the control pressostat alarm when the heat pump is producing heat Hot water stop cond This setting decides whether the heat pump should stop making hot water when the hot water temperature limit is reached or whether it should conti nue as long as possible until the control pressostat triggers Return temp limit Alarm limit for high temperature on heat pump return Whe...

Page 23: ...djusted at diffe rent room temperature deviations from the set point Calendar room temp A week schedule that decides at what times the room temperature set point should be adjusted Can be used to lower temperatures at night The setting Calendar offset decides how much the room set point is to be adjusted when the week schedule is active Max system temp The highest value allowed for the primary sup...

Page 24: ...trolled by the system Heat up delay Heat up delay time from when the extra heater blocking is released starting the burner until the shunt valve starts to use heat from the burner subsys tem Burner off delay Delay from when the valve is shut off completely until the burner is turned off Turn on limit An extra heater in the form of an electric heater that can only be on or off is controlled not onl...

Page 25: ...um allowed number of running pumps Brine out min temp Lowest allowed temperature for outgoing brine Brine in min temp Lowest allowed temperature for incoming brine Brine in max temp Highest allowed temperature for incoming brine Time limit Time limit before the number of running pumps is limited 3 6 6 Hot water Start limit Temperature limit for when a heat pump is started to make hot water Delta l...

Page 26: ...should not close completely this setting defines the minimum shunt signal 3 6 8 TWC Start temp out Temperature limit on the hot water outlet for starting the heater Stop temp out Temperature limit on the hot water outlet for stopping the heater Start temp return Temperature limit on the hot water recirculation return for starting the heater Stop temp return Temperature limit on the hot water recir...

Page 27: ... temperatures is set Only for outdoor temp compensated shunt groups Shunt 1 set point Set point for shunt groups keeping a constant temperature Shunt 1 outdoor temp stop Outdoor temperature at which the circulation pump and controller for the shunt group is stopped Shunt 1 hysteresis Hysteresis for restarting the circulation pump and controller Shunt 1 p area P area for the shunt controller Shunt ...

Page 28: ... zero disables the control completely Circulation delay To allow cold water to be pumped up from the bore hole to the cooling tank before the valve is opened this setting defines a delay that begins when a brine circulation pump is started Longer pipes make longer delays necessary 3 6 10 2 Cooling circuit Cool circ set point Set point for the cooling circuit Dew point control Activates and deactiv...

Page 29: ...he manual override sub menu lists all the outputs and some other signals that can be manually overridden In one setting the value to override the controller is chosen and another activates and deactivates the override When a manual override is deactivated the controller instantly takes over the signal In the event that an operator forgets to deactivate a manual override the sig nal will automatica...

Page 30: ...lly the same module HPC EM The functionality is selected by dip switches on the front and if these are set wrong the module will be shown in the wrong sub menu list These modules will not work until activated 3 7 3 Shunt groups Up to eight shunt modules can be connected and active in one system All shunt modules are listed in the shunt menu You not only select whether a shunt module is to be activ...

Page 31: ...arms are allowed to be sent during a 24 hour period This limit is there to prevent badly set alarm limits and frequently reoccurring errors from spending too much money on SMS When the max limit has been reached a final SMS is sent informing the receiver that no more SMS will be sent until the SMS alarm is acknowledged Up to four phone numbers for SMS receivers can be defined Remember that the com...

Page 32: ...e that uses Ethernet to upgrade software in the controller After 30 minutes the web passwords are reset to the values you get when you buy the web license regardless what they were before 3 8 13 Restore passwords Restore passwords resets the passwords for web access to the passwords you get when buying a web licence This command can be used when the pass words have been changed and forgotten The p...

Page 33: ...heat pump In each heat pump regardless of whether it is a master or slave configura tions have to be set as to whether it is connected to make hot water or not In the menu Settings Heat pump you will find the setting Hot water production 8 1 2 where this is defined In the same menu you will also find the setting Pressure flow guard 8 1 9 which tells the controller system what kind of guard is inst...

Page 34: ...e if the sensor wiring is faulty The first step is therefore to check and get rid of all alarms However not all sensors have alarms and the absence of an alarm is not a guarantee that a sensor has been correctly installed and is working You should therefore check that all sensors display reasonable readings You can do this in the menu Information under Temperatures All temperatures in the system c...

Page 35: ...he settings regarding heat and hot water Among the important things to do is to adjust the set point curve for heat so that it corresponds to the needs of the specific building The last step would be to activate the slave pumps using their respective ope rator panels For each slave pump the setting Operational mode in the menu Operation mode should also be changed to auto It is also possible to ac...

Page 36: ...ature compensation curve is a kind of P factor for the controller Incorrectly set room temperature compensation can cause the primary supply temperature to oscillate and due to the high inertia of a building heating system this can be a very low frequency oscillation Too weak compensation on the other hand does not do a very good job at all at keeping the room temperature constant The main factor ...

Page 37: ...e to relevant personnel also becomes more common E mail thus becomes another way to connect WM HPC to superior supervisory systems 5 3 Control by external PLC In some cases there may be a need to control the heat pump from another control system than the one in the WM HPC The alarms and protective func tions built in to the heat pump should still be active and there is therefore a special mode in ...

Page 38: ...s 5 4 The sum alarm relay output The heat pump control system has an alarm output that sends out 24 VAC as soon as any A or B alarm is active This signal can be used to send information to a superior control system ...

Page 39: ...me Sensor supply temp B X A fault in the heat pump s supply temperature sensor has been detected Sensor return temp B X A fault in the heat pump s return temperature sensor has been detected Broken outdoor temp B X A fault in the outdoor temperature sensor has been detected The control system assumes the outdoor temperature is zero Sensor hot water B X A fault in the temperature sensor for hot wat...

Page 40: ...ctrl err B X Large controller error on shunt group 6 Shunt 7 sensor B X Temperature sensor for shunt group 7 is faulty Shunt 7 ctrl err B X Large controller error on shunt group 7 Shunt 8 sensor B X Temperature sensor for shunt group 8 is faulty Shunt 8 ctrl err B X Large controller error on shunt group 8 Wcs sensor error B X Faulty temperature sensor at the WCS module Wcs controller error B X Lar...

Page 41: ...nd outputs are connected to DIGITAL OUT Usage DO1 Start stop compressor DO2 Start stop brinepump DO3 Start stop rad pump DO4 Channel 36 DO5 Block extra heater DO6 Sum alarm DO7 System pump DIGITAL IN Usage DI1 High comressor current DI2 High pump current DI3 Control pressostat DI4 Högtryckspressostat DI5 Lågrtryckspressostat DI6 Flowsensor DI7 DI8 External brine start Discharge pipe temp ...

Page 42: ... V6 42 Danfoss ...

Page 43: ...76 Danfoss 43 8 Menu overview ...

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