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14
General
Information
turning off except during an Emergency Stop condition. If an Emergency
Stop is initiated, the Solution Pump is immediately turned "Off" (relay de-
energized).
Low Ambient Pump Control (Standard)
A Low Ambient Pump "On" Control function (LAPC) allows the pump to run
continuously if the outside ambient temperature falls below a programmable
Low Ambient Pump "On" Temperature (LAPT) Setpoint or if an outside
ambient temperature input failure occurs. An Auto Reset Diagnostic will be
issued and remain as long as the condition exists.
This function will be disabled when an Emergency Stop request is initiated.
During service test operation, if a low ambient condition exists when the
operator attempts to turn the pump "Off", a message will be displayed on the
Human Interface Module advising that the pump cannot be turned off due to
the low ambient condition.
Emergency Stop (Optional)
Is accomplished when a customer provided, field installed binary input
device is connected to the CGM. The unit will immediately shut down when
the contacts are opened. Emergency Stop is a top priority command that will
override all other commands received by the UCM. A manual reset
diagnostic will occur and an indication showing that the unit is shut down due
to Emergency Stop will be displayed at the Human Interface Module.
External Auto/Stop (Optional)
The unit can be Stopped and Started by a remote customer provided field
installed binary input device (such as a time clock) connected to the CGM.
When the input is opened (Stop), the unit will stage the compressors and the
solution pump "Off" in a normal manner and display "Off due to external
stop" at the unit Human Interface. When the input is closed (Start), the unit
will start and run normally.
The External Auto/Stop input operates in the same manner as the STOP/
AUTO keys on the unit mounted Human Interface or the Remote Human
Interface (RHI). However, the Stop key at the unit mounted Human Interface
has priority over both the remote External Auto/Stop and the Remote Human
Interface Auto/Stop.
Note: If the STOP key is pressed at the unit mounted Human Interface, no
remote AUTO (Start) key will start the unit until the AUTO key is pressed at
the unit mounted Human Interface.
A start (AUTO) command is allowed only if no overriding diagnostics or
higher priority function is present.
CSRA-SVX02A-EN
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