Carrier Pro-Dialog CONTROL 4 Bedienungsanleitung PDF herunterladen (Seite 4)

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Contrast control

wheel

Back to the previous

screen

On/o key

- Unit stopped

- List of available operating

modes (only in local mode)

Green LED

Unit has stopped

Unit starts up

Unit in operation

Red LED

No alarm

Warning

Circuit or complete unit error

Up/Down key

- Navigation

- Modication

Enter key

- Validation

- Access to the operating mode selection

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The control system consists of an NRCP2-BASE board for

single-circuit units (up to two compressors) and two NRCP2-

BASE boards (one master and one slave board) for units

with three or four compressors.

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All boards are supplied from a common 24 V a.c. supply

referred to earth.

CAUTION: Maintain the correct polarity of the power

supply connection of the boards, to ensure that they are

not damaged.

If the power supply fails, the unit restarts automatically

without the need for an external command. Any faults active

when the supply is interrupted are saved and may in certain

cases prevent a circuit or unit from restarting.

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All boards continuously check and indicate the proper

operation of their electronic circuits. A light emitting diode

(LED) on each board lights when it is operating properly.

• The red LED ﬂashes for a two-second period - one

second on, one second off - to indicate correct operation.

A different rate indicates a board or a software failure.

• The green LED ﬂashes continuously on all boards to

show that the board is communicating correctly over its

internal bus. If the LED is not ﬂashing, this indicates a

LEN bus wiring problem.

• The orange LED of the master board ﬂashes during

any communication via the CCN bus.

All boards communicate via an internal LEN bus. The

NRCP2-BASE boards continuously manage the informa-

tion received from the various pressure and temperature

probes. The NRCP2-BASE master board contains the

program that controls the unit.

The user interface includes an alphanumeric eight-line

display, two LEDs with ﬁve navigation keys as well as a

contrast control wheel.

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