6 SYSTEM CONFIGURATION
In this section we will look at how to configure parameters for various loads on the basis of the type of installation to be
controlled.
6.1 Compressors
Ech 200 BD can control systems consisting of one cooling circuit with 1 or 2 compressors.
If there is a capacity step, it will be considered as a compressor.
Each compressor is piloted by a device relay.
Compressors will turned on or off depending on the temperatures detected and the temperature control functions that
have been set (refer to the section on Compressor controls – regulation algorithm)
6.1.1 Compressor configuration
The first compressor must be connected to output NO1;
The second compressor, if there is one, must be connected to output NO3, with the following parameter settings:
• Pa H48=2 (2 compressors per circuit)
• Pa H23=2 (output NO3 configured as compressor/capacity step) or Pa H25=0 (open collector output for the
second compressor/capacity step).
If the open collector output is used, an external relay will be required for compressor management.
If NO3 is configured as a second compressor/capacity step output, polarity may be selected using the parameter
Pa H51, polarity of compressor 2/ capacity step output (on relay 3 only).
• 0= relay ON if compressor 2/ capacity step ON,
• 1= relay ON if compressor 2/ capacity step OFF.
The polarity of NO1 is unvariable:
• relay ON if compressor 1/ capacity step ON
6.1.2 Compressor on/off sequence
The order in which the compressors come on may be modified using parameter Pa H50, compressor on sequence:
• Pa H50=0 compressors come on depending on the number of hours of operation (balancing hours of operation)
• Pa H50=1 compressor 1 is turned on first, followed by compressor (or capacity step) 2 (unvaried sequence).
If Pa H50= 0, the compressor with the least hours of operation comes on first, unless it is subject to:
a current compressor shutdown alarm (refer to table of alarms)
safety timing in progress.
If Pa H50= 0, the compressor with the most hours of operation is turned off first.
If Pa H50=1:
compressor 2 (capacity step) is turned on only if compressor 1 is already on.
compressor 1 is turned off only if compressor 2 (capacity step) is already off. If there is a compressor 1 shutdown alarm,
compressor 2 will be turned off immediately.
6.1.3 Compressor timing
The turning on and off of compressors must comply with safety times which may be set by the user using the parameters
specified below:
There is a safety interval between the time a compressor goes off and the time the same compressor comes back on
(compressor on…off safety time, controlled by parameter Pa C01);
This interval of time must elapse when the “ECH 200 BD” is turned on.
There is a safety interval between the time a compressor is turned on and the time it is turned on again (compressor
on...on safety time, controlled by parameter Pa C02) .
COMPR: compressor Time: seconds x 10
Pa C01: ON-OFF safety time Pa C02: ON-ON safety time
Power step
Polarity NO3
Balancing hours of
operation
Unvaried sequence
Safety timing
Of
-on timing
On-on timing
Off-on and on-on
comp. diagram
ON
OFF
Pa C01
Pa C02
Time
COMPR
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