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Base Loading Control Algorithm
Base Loading Control Algorithm
This feature allows an external controller to directly modulate the capacity of the
chiller. It is typically used in applications where virtually infinite sources of evaporator
load and condenser capacity are available and it is desirable to control the loading of
the chiller. Two examples are industrial process applications and cogeneration plants.
Industrial process applications might use this feature to impose a specific load on the
facility's electrical system.
Cogeneration plants might use this feature to balance the system's heating, cooling
and electrical generation. All chiller safeties and adaptive control functions are in full
effect when Base Loading control is enabled.
If the chiller approaches full current, the evaporator temperature drops too low, or the
condenser pressure rises too high, Tracer AdaptiView Adaptive.
Control logic limits the loading of the chiller to prevent the chiller from shutting down
on a safety limit. These limits may prevent the chiller from reaching the load requested
by the Base Loading signal.
Base Loading Control is basically a variation of the current limit algorithm. During
base loading, the leaving water control algorithm provides a load command every 5
seconds. The current limit routine may limit
the loading when the current is below setpoint. When the current is within the dead-
band of the setpoint the current limit algorithm holds against this loading command.
If the current exceeds the setpoint, the current limit algorithm unloads.
The "Capacity Limited By High Current" message normally displayed while the current
limit routine is active is suppressed while base loading.
Base loading can occur using Tracer or an external signal.
Tracer or an external signal Base Loading: Current Setpoint Range: (20 - 100) percent
RLA.
Base Loading requires Tracer Summit and an optional Tracer Communications Module
(LLID)
CVGF-SVX03B-EN
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