GE E4H-CE - Manual (Page 5)

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1.0 OVERVIEW
The GE Osmonics E4H-CE and E8-CE water treatment systems consist of modular equipment that
is designed to work together with the reverse osmosis (RO) machine at the heart of the system.
The Programmable Logic Controller (PLC) and Operator Interface Terminal (OIT) are pro-
grammed to control a complete, integrated system. A water purification system may consist of the
following modular equipment:
· Media Filter(s)
· Chemical Injection System
· Clean-In-Place (CIP) System
· Permeate Storage Tank
Your system may or may not contain all of the modular equipment listed above. To accommodate
the variations possible, the control system is designed to allow the user to operate with any of the
components list above.
1.1 Hardware
A SIEMENS S7-222 PLC, located in the control enclosure, controls the system. Operator
interface is done with a SIEMENS TP070 OIT mounted on the enclosure door. A Hanna
Instrument 983320 Conductivity Meter and a 981411 pH Meter provide display of oper-
ating conditions as well as alarm and control set points.
Electrical enclosure door mounted lights and switches are as follows:
POWER ON: A clear light which indicates that the control voltage is applied to the
enclosure panel.
E-STOP: A latching push-button switch that will interrupt power to the PLC
outputs and inputs causing the system equipment to immediately
shut down. In case of an emergency, using this push button will
bypass the normal shutdown procedure required to safeguard the
equipment. The E-STOP switch must be pulled out and the E-STOP
RESET button and the alarm reset button on the OIT pushed to
restore power to PLC inputs and outputs and restart the machine.
The E-STOP is lit when it is engaged and the control relay is not
powered.
E-STOP RESET: A momentary push-button switch that will restore power after the E-
STOP switch has been pushed (latched) and pulled out (unlatched).
1.2 Software
The SIEMENS S7222 PLC is programmed with SIEMENS Step 7-Micro Programming
Software. The SIEMENS TP070 OIT is programmed with SIEMENS STEP 7-Toolbox
Programming Software.