Emerson ZX, Руководство пользователя

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12.1 Compressor/Unit Setting
Each ZX unit model has an unique compressor model and this has to be programmed in the
set-up of the E2 controller. For this purpose a Compressor Rotary Switch is located near the
bottom left hand corner of the E2 board. ( See Diagram in previous page) This is Factory Set and
should not be re-set after the leaving the Factory. Any tampering with this Compressor Rotary
Switch may result in any warranty claims becoming null and void.
12.2 Compressor Motor Protection
The E2 protects the compressor motor against the following:
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Over current
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Voltage imbalance (between phases)
•
Loss of any one phase
•
Incorrect phase rotation
If the compressor motor current exceeds a pre-defined current limit (non-adjustable), then the E2
shuts down the unit and generates an error signal to the LED’s on the board.
For this function to operate, two of the main phase supply lines to the compressor (compressor via
the contactor) are routed through the Current Abnormality Coils.
12.3 Compressor Pressure Protection
12.3.1 High Pressure
A sensor is registered by the E2. The sensing device is a non-adjustable, low voltage
pressure switch that will open in event of an abnormally high discharge pressure (above 2.8Mpa).
•
The unit will stop and then restart automatically after a 3-minute delay.
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After 5 successive HP cut-outs over 1hour, the unit will lock-out.
•
Unit reset procedure is as described in the previous table (above).
[Note: Unit lock-out can activate a telephone dialer and buzzer plus signal on the LED’s of
the Diagnostic Module (option), if this option is available on your unit.]
12.3.2 Low Pressure
In a similar way to the high pressure sensor, the E2 registers the switching action of a
non-adjustable, low voltage pressure switch that will open in event of an abnormally low suction
pressure (below 0.1Mpa).
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The unit will stop and then restart automatically after a 3 minute delay.
•
There is NO lock-out for this Switch.
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