Handbook - Eurotherm Ltda

T820 HANDBOOK2.5.2Electrical InstallationNote. Before carrying out any wiring, please read the Safety and EMC Information.WarningVoltages of greater than 40V (peak), relative to the safety earth potential, must never be applied to any of the dc inputterminals (positive or negative), as under such circumstances, the unit may become hazardous to the touch.It is recommended that external 2 Amp fuses are fitted in each positive supply line.CautionAlways ensure the power is isolated prior to removing the rear cover and before configuring the hardware.A Polycarbonmonofluoride Lithium battery is also fitted in the unit. When fully charged this will maintain the SRAMand Real-Time Clock (RTC) data for approximately 1.5 years discontinuous use.POWER RING CONNECTIONThe unit can be connected as part of a Power Ring to a maximum of 16A.1. Connect the input supply to the + and - terminals,ensuring the correct polarity.2. Connect the output from the remaining + and -terminals.REDUNDANT POWER CONNECTIONRedundant Power can be supplied via two independant sources.Note. Remove the Redundant Power Supplywire link, Figure 2.3, to enableRedundant Power Supply facility.10/100TERMUNTERM5W3WLK1 LK2+ + - -24VRedundant PowerSupply wire link1. Connect the first input supply to the + and -terminals. Ensure the correct polarity.2. Connect the second input supply to the + and- terminals. Ensure the correct polarity.Input Supply+-+ -Second Input supply oroutput to next instrumentFigure 2.5.2Power Supply connections2.5.3Safety earth connectionAs shown in Figure 2.3, an earth stud connection is provided. This stud should be bonded to a good local earth usingmultistrand tri-rated 1.5mm 2 (21A) green/yellow earth cable, with ring terminals for security.Chapter 2Page 2 - 10HA029131Issue 3 Feb 08