Double limit switch FCD25 Programmable double limit switch Analogue input 0(4) - 20 mA Selectable min- or max limits Start-up and reaction timer Supply voltage 24 VDC Programmable inputs Made in accordance with the and EMC regulations FCD25 is a double limit switch for monitoring of current signals, f.inst. from 2-wire transmitters with 4-20 mA output or other units with current output. Analogue input The analogue input is programmable for either 0-20 mA or 4-20 mA. The input range is adjustable too, down to 10 mA for 100% input range. Digital inputs The digital inputs are programmable for either positive or negative logic. The inputs are programmed for either active low or active high. At positive logic, input signals from 5-30 VDC are accepted. At negative input, the input is connected to ground f.inst. with a contact or an NPN output from a sensor. Relay outputs The unit is supplied with 2 relays, one for each limit. Both relays have NO-contacts, and both of them are programmable for either activation or release, when the set limit is exceeded. The alarms can be reset with the "Mode" button or input "S1". Setpoints The unit have two independent setpoints, programmable as either min. or max. setpoint. The setpoints are selected as a percentage of the range. It is possible to cancel the monitoring with the input S2. Start up timer The start up timer is used if the start-up of a process is unstable and you do not want an alarm during start-up. It is activated when the input signal exceeds approx. 5 % of the metering range. If the start-up timer is set at 0, this function is cancelled. Reaction delay For each setpoint you can program a reaction delay in order to avoid alarm in case of only a short exceeding of the setpoint. Hysteresis The hysteresis can be used on both limits. The hysteresis band is always above a min-limit and under a max-limit. If the hysteresis function is used, an internal auto-reset function is used. If you use the hysteresis at a min. setpoint, at the input signal goes to zero, you can reset the alarm by pressing the "Mode" button or activate input S1. Technical data: 24 VDC +/- 10% max. 60 mA -15°C to +50°C 0 - 90% RH, non-condensing 1-pole: 5 A - 250 VAC, ohmic load 0(4) - 20 mA, 70 Ohm pos. logic: 5-30 VDV neg. logic: 0 V External reset Alarm blocking 200 g 58 x 36 x 86 mm Supply voltage: Current consumption: Operating temp.: Humidity: Max. load, relays: Analogue input: Digital inputs: Indput S1: Input S2: Veight: Dimensions: EMC og safety regulations. Emmision: EN 50 081 - 1 Immunity: EN 50 082 - 2 Safety: EN 60 730 Approvals: The units are produced in accordance with the CE og low voltage regulations.

Selection of parameters. In the scheme you can see the 11 user programmable parameters. To get into the programming mode, press ‘Mode’ until the ‘Setup’-LED is on and the display shows ‘P00’. Then you used the ‘Up’ and ‘Down’ for selection of the wanted parameter followed by ‘Mode’. Now the wanted parameter is selected, and you can change the value by pressing ‘Up’ and ‘Down’. The new value is stored by pressing ‘Mode’, and then you can select a new parameter. To end the programming mode you select Par. no. 00 and when you press ‘Mode’ you return to normal function. Start-up timer Reaction delay...