Sierra Not available instruction manual Rear Panel Connections

Series 900 Single & Dual Instruction Manual

The AC power line connector (or power entry module) is located on the back panel. A cordset is supplied with the System Electronics and is compatible with wall outlets in the USA. Be sure System Electronics is wired for the proper power mains voltage, either 115 VAC, 60 Hz or 230 VAC, 50/60 Hz, as indicated on the label. If you wish to change the receptacle configuration, you may use any standard CEEE 22 cordset to accomplish this.

The fuse is an integral part of the AC power connector. To remove the fuse, turn the front panel power switch OFF then remove the cordset from the back panel power connector. With the cordset removed, a small door built into the back panel power connector can now be flipped out exposing the fuse holder. In USA System Electronics there is a single gray fuse holder which can be unclipped and pulled out by hand. The fuse is an AGC type 3 amp rating. Replacement fuses are widely available.

4 REAR PANEL CONNECTIONS

4.1 Power Line and Fuse

The back panel has two 20-pin headers labeled Channel 1 and Channel 2. Each channel is set-up for a specific transducer. Be sure that the serial number on the side of the transducer agrees with the rear panel label. Normally, cables are prewired and the entire system is set-up at the factory. Pin assignments are given in Appendix B.

CAUTION! Do not plug a transducer into the wrong channel, as flow values may be extremely inaccurate and/or damage may result to system electronics and transducer.

The 26-Pin I/O Connector on the back panel is the means to access many of the System Electronics functions such as flow outputs, valve override and monitoring, etc. The following section covers these functions in detail. Refer to Appendix B for pin assignments.

The 26-pin I/O connector provides two analog outputs for each channel. One provides a 0-5 VDC LINEAR analog of the flow value referred to common. The other supplies a 4-20 mA LINEAR analog of the flow value referred to +15 VDC. Both outputs are always present for all channels. Refer to Appendix B for pin assignments.

4.2

20-Pin Connectors for Sierra Flow Meters/Controllers

4.3

26-Pin I/O Connector

4.3.1 Flow Value Output 0-5 VDC and 4-20 mA

The 26-pin I/O connector has connections for Side-Trak controller systems to drive the valve fully closed or fully open. Also, the voltage across the valve may be monitored to help in valve adjustment.

If the VALVE OFF pin for a channel is connected to common, the valve is closed regardless of setpoint. This pin is TTL compatible. Refer to Appendix C for pin assignments.

4.3.2 Valve Off/Purge/Monitor (Side-Trak Controllers Only)

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