GE BAKER HUGHES Masoneilan SVi 1000 Quick Start Manual

Masoneilan SVi1000 Positioner Quick Start Guide =| 59© 2019 Baker Hughes, a GE company, LLC. All rights reserved.General Configuration NotesThe SVi1000 supports two identical contact outputs, SW #1 and SW #2 (Digital Output switches),that can be logically linked to status bits.The switches are polarity sensitive and must be connected only to a DC circuit. The switch (+) ter-minal must be electrically positive with respect to the (–) terminal. If the (+) terminal is electricallynegative with respect to the (–) terminal, then the switch will conduct, regardless of switch state.If the switch is connected directly across the power source, the current will be limited onlyby the capacity of the power source and the switch can be damaged.This section discusses the necessary precautions when configuring a system.Without a load, when the switch is on (closed) the external voltage would be dropped across theswitch. This damages the switch (Figure 32).Figure 32 Switch Installation Drawing without Load: Configuration Not AllowedSwitch OFF Switch ONVSWITCH 30 VDC max.  1 V (Switch saturation voltage)ISWITCH  0.200 mA (Switch leakage current) 1 A max.Incorrect polarity connection results in aneffectively closed connection.SVi1000SwitchOutputExternalVoltageSourceNOT ALLOWEDFull voltagedrop isoccurringacross theswitch (nocurrent limit inplace)+--+CAUTIONAppendix B. Optional Switch Load Limits