Fema C Series User Manual

Also see for C Series: Quick installation guide

Fema C Series User Manual Manual pdf 11 page image

FEMA ELECTRÓNICA . Series C . C40-D11• Measuring process signalsThe instrument accepts the measure of process signals in4/20 mA and 0/10 Vdc. The instrument provides excita-tion voltage to power up transducers.• ScalingThe instrument allows to scale the reading to 4 digits (9999 / -1999)with configurable decimal point to any position. The ‘second scaling’function can also be used (see section 1.25).• Maximum oversignal‘Maximum oversignal’ is the maximum signal accepted by the instru-ment. Higher signal values may cause instrument damage. Lower val-ues are non destructive but may be out of accuracy specifications.• Response timesThe response time to a signal step is 300 mSeconds, independent ofthe signal range selected.• Terminal 5 ‘multifunction’ - ‘Vexc’ or ‘External control’To configure the +15 Vdc excitation voltage at terminal 5, set internaljumper ‘T’ at position 1-2 (see section 1.9). Transducers with a con-sumption of up to 30 mA can be powered from this terminal.To configure the ‘EK’ external contact function at terminal 5, set inter-nal jumper ‘T’ at position 4-5 (see section 1.9). See section 1.9 for a listof available functions.1.16 Process measures• Start-up, connections and jumpersFor instrument start-up follow the steps listed at section 1.7. Signalconnections are indicated at section 1.5. Location for internal jumpersis indicated at section 1.9.See below a list of typical connections :• signal 4/20 mA active• signal 4/20 mA passive • signal 0/10 Vdc passivesignal ( mA-)+15 Vdc (mA+)1 2 3 4 5+Vdccommon+15 Vdc1 2 3 4 5• signal 0/10 Vdc activemA +mA -1 2 3 4 5+Vdccommon1 2 3 4 5Rangesof measureScaleby defaultScalable Jumper ‘S’(see section 1.9)Jumper ‘T’(see section 1.9)Accuracy(% FS)Max.oversignalConnection(terminals)Zin4/20 mApassive(needs Vexc.)0/100.0 de 9999a -1999D 1-2 <0.15 % 25 mA2 (signal)5 (Vexc) 4.7 Ohmactive 4-5 2 (mA+)4 (mA-)0/10 Vdcpassive(needs Vexc.) A 1-2 <0.20 % 25 Vdc2 (+Vdc)4 (comm.)5 (Vexc) 1 Mactive 4-5 2 (+Vdc)4 (comm.)Table 15 - Ranges of measure for process signals1.17 Measuring frequency• How the instrument measures frequencyThe instrument measures frequency from an AC voltage(Vac) or AC current (Aac) signal. The instrument detectseach ‘0’ crossing of the signal, either ‘0 Vac’ or ‘0 Aac’. Allavailable Vac and Aac signal ranges are accepted as frequency inputsignal.• How to configure the instrument to measure frequencyTo measure frequency from a Vac signal, select the internal jumpers forthe desired AC voltage range (see section 1.9), connect the signal forthe selected voltage range (see section 1.10), and configure the instru-ment to measure frequency (see section 1.29.1). The same applies tomeasure frequency from Aac signals. See example at section below.• ScalingThe default resolution is 0.1 Hz. The instrument allows to scale thereading to 4 digits (9999 / -1999) with configurable decimal pointto any position. The ‘second scaling’ function can also be used (seesection 1.25).• Maximum and minimum signalFrequency signals below 15 Hz are measured as ‘0’. Frequency sig-nals higher than 100 Hz are out of accuracy. Signals higher than1000 Hz will read ‘display overflow’ ‘d.oVr’ error.Rangesof measureScaleby defaultScalable AC signal(see section 1.9)Jumper ‘T’(see section 1.9)ResponsetimeAccuracy(% reading)15 Hz to100 Hz 0/100.0 from 9999to -1999select Vac orAac range 4-5 70 mSec. <0.15% ofreadingTable 16 - Ranges of measure for frequency• ExampleTo measure the 50 Hz frequency from a 230 Vacpower line, select jumpers ‘GI’ for 600 Vac signalrange (see section 1.9), connect signal to termi-nals ‘1’ and ‘4’ (see section 1.10), and configure‘frequency’ at the input signal configurationmenu (see section 1.29.1).