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Controllers
must have all operational, programmable parameters accessible
via the front panel LCD/Keypad and remotely via simple
Microsoft HyperTerminal program. |
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All operational
sequences such as compressor start/ stop, Lead/Lag,
etc. must be able to be modified by simply changing
appropriate parameters from the front panel LCD/Keypad
and remotely via simple Microsoft HyperTerminal program,
i.e. it should not be necessary to change the control
logic program in order to modify any control sequences. |
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Must be able
to connect via lap top PC directly to the controller
at the site or remotely via modem and access all programmable
and viewable parameters and set/reset parameters. |
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Include
built-in auto dialer capable of dialing up to 4 tel
numbers and/or pagers |
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Must be “connection
ready” for Web based Monitoring and Alarming Systems
such as GE CellCon, etc. |
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Single board
solution instead of slot based controls to withstand
compressor vibration and electrical noise. |
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CSA, UL or Factory Mutual
approved for operation in Class 1, Div. 2, Groups C&D
Electrical Hazardous locations as a complete unit designed
for CNG applications. In other words, the whole controller
as complete assembled unit must be 3rd party approved
for operation in this hazardous location and not individual
components within the controller. |
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Built-in Temperature
compensation for storage fill system and GRI “Accufil”
fast fill dispensing algorithm. |
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All Digital inputs (shutdown
contacts) to be fully programmable for Normally Open
(NO) or Normally Closed (NC) operation. |
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All Analog Inputs to
have separate hi/lo shutdown set points for compressor
start sequence, run sequence and stop sequence. |
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All analog inputs fully
programmable for 0-5 Volt, 0-10 Volt or 4-20mA input
signals. |
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All analog inputs fully
programmable for sensor scaling – High Engineering
Units, Low Engineering Units, High Raw Units and Low
Raw Units. |
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All Inputs and Outputs,
analog and digital to be fully programmable for description
tags from front panel LCD/Keypad or via PC HyperTerminal. |
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NEMA 4 Enclosure with
all field connections accessible on DIN rail mounted
Terminal blocks for easy access. |
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LCD/Keypad and control
switches mounted on inner door panel for additional
protection. |
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Built-in internal enclosure
temperature sensor for enclosure fan and heater controls |
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Built-in ambient temperature
sensor for skid fan control and storage gas temperature
compensation. |
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Built-in gas and fire
detection channels – analog and digital |
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Two serial ports RS232
or RS422. One for PC HyperTerminal Interface(local or
remote via modem) and one for MODBUS RTU protocol interface. |
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Built-in MODBUS RTU protocol
for SCADA interface |
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Built-in Lead/Lag operation
capability for up to 3 compressor lead/lag operation |
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CNG