Danfoss AKC 25H1 Description

Also see for AKC 25H1: Instructions

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Danfoss AKC 25H1 Description Manual pdf 15 page image

AKC 25H1 Function description RC.1J.Z4.02 © Danfoss 09/1999 15The controller must be supplied with 230 V a.c., with live connected to terminal No. 2. It is arequirement that the controller has earth connection. It is installed at the terminal next to themains connection.A 1 A slow-blowing Ø5 x 20 mm fuse should be mounted in series with the live.The controller has been factory-set at a network frequency of 50 Hz. If the supply is 60 Hz, thesetting must be changed to this value.Main function Main switch Mains freq ____The controller has two functions that can start and stop the regulation. A function switch insidethe unit that can be set via the control function and an external input that can be connected toa switch.InternalThe switch has three positions:- Normal regulation (setting = +1)- Regulation stopped (setting = 0)- Service function. (setting = -1)Main function Main switch Main switch +1/0/-1If the switch is set in pos. 0 or -1, all the controller’s functions are inactive. An alarm with thetext “Standby mode” is generated to indicate that regulation has stopped. If the switch is inpos. +1, regulation has begun for the functions selected with “ON”.ExternalIf the external function switch is used, a switch for the “Main Switch” input must be connected.If it is not used, the input must be shortcircuited. There are two menu groups that only canbe set when the MAIN SWITCH input is interrupted. The two groups are the following:“Input Configuration” and “Output Configuration”.The combination of internal and external switch is, as follows:- Regulation is only carried out when both switches are in pos. ON (internal = +1 and external= shortcircuited).- Service settings can be made when the internal switch is put in pos. “Service Function”(setting = -1) External = shortcircuited.- All other combinations will stop the regulation.The controller contains a clock function. Setting of days, hours and minutes can be performedhere.AKC 25H1 Adr: -- Clock: day: 1-7 (1=Monday, 7=Sunday)AKC 25H1 Adr: -- Clock: hour: 0-23AKC 25H1 Adr: -- Clock: min: 0-59Note:If the controller is connected to an installation with gateway, type AKA 243/244, the gatewaywill reset the clock function after a power failure.Supply voltageFunction switch(Main Switch)Sensor failureIf a missing signal from one of the connected temperature sensors or pressure transmitters isregistered, an alarm will be given. If it is PO (the pressure transmitter for the suction pressure)that fails, the refrigeration will immediately be stopped. If it is the Pc unit (the pressuretransmitter for the condensing pressure) that fails, the whole condenser capacity will be cut in.Clock function