Fema C Series User Manual

Also see for C Series: Quick installation guide

Fema C Series User Manual Manual pdf 7 page image

FEMA ELECTRÓNICA . Series C . C40-D71.11 Measuring DC voltages and DC currents• Measuring DC signal rangesThe instrument accepts the measure of DC voltagesand currents, with ranges from 60 mVdc up to 600 Vdc,covering applications with current shunts, tachometricdynamos, batteries, process, etc. DC currents signals upto 5 Adc are accepted, and it has a range of 20 mAdc.• Bipolar rangesAll signal ranges are bipolar, and the instrument can measure boththe positive and the negative signal.• 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 in-strument. Higher signal values may cause instrument damage. Low-er values are non destructive but may be out of accuracy specifica-tions.• Response timesThe response time to a signal step is 300 mSeconds, independent ofthe signal range selected.• Terminal 5 ‘multifunction’ - External controlTerminal 5 remains configured as ‘EK’ external control function. Seesection 1.9 for a list of available functions.• 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 jump-ers is indicated at section 1.9.Vdc ranges Scaleby defaultScalable Jumper ‘S’(see section 1.9)Jumper ‘T’(see section 1.9)Accuracy(% FS)Max. oversig-nalConnection(terminals)Zin±600 Vdc 600from 9999to -1999G4-5 <0.20 %800 Vdc 1(+) 4(-) 12 M±200 Vdc 200.0 - - - 800 Vdc 12 M±20 Vdc 20.00 A 150 Vdc2(+) 4(-)1 M±2 Vdc 2.000 B 100 Vdc 100 K±200 mVdc 200.0 C 30 Vdc 10 K±60 mVdc 60.0 E <0.25 % 3 Vdc 1 MTable 7 - Measuring ranges in VdcAdc ranges Scaleby defaultScalable Jumper ‘S’(see section 1.9)Jumper ‘T’(see section 1.9)Accuracy(% FS)Max. oversig-nalConnection(terminals)Zin±5 Adc ±5.00 from 9999to -1999- - - 4-5 <0.25 % 7 Aac(max. 7 sec.) 3(+) 4(-) 20 mOhm±20 mAdc ±20.00 D <0.15 % 25 mAdc 2(+) 4(-) 4.7 RTable 8 - Measuring ranges in AdcApplications... with shunts ...measure of DC currents through a cur-rent shunt of 60 mV, 100 mV or 150 mVand scaled reading... direct measure ... direct measure of currents up to 5 Adcand voltages up to 600 Vdc... with batteries ... measure of the battery voltage at12 Vdc and 24 Vdc... with tachometric dyna-mos ...read the speed in RPM from a tacho-metric dynamo voltage signal... with speed variators ...measure the voltage signal from thevariator, proportional to the RPM speedof the motorTable 9 - Applications with DC signalsSee below a list of typical connections :±5 Adccommon1 2 3 4 5±600 Vdccommon1 2 3 4 5±60 mVdccommon1 2 3 4 5• ±5 Adc• ±600 Vdc• ±200 Vdc• ±20 Vdc to ±60 mVdc• ±20 mAdc