Contrast Adjustment; Alarms; Controller I/O Module - Black Box CRCW-12 User Manual

Cold row chilled water (cw)

Table of Contents

Chapter 4: E2 Controller

4.1.2.2 Contrast Adjustment

Press and hold the Alarm (

) and Prg (

) keys, then use the Up

and Down

keys to adjust the contrast.

Alarm conditions activate a red LED indicator that backlights the alarm function key. As an option, an alarm condition may also be

enunciated by an audible alarm signal. An alarm is acknowledged by pressing the alarm key. This calls up alarm display screen(s)

that provide a text message detailing the alarm condition(s). After an alarm condition is corrected, the alarm can be cleared by

pressing the alarm key.

The controller is a microprocessor-based I/O module mounted inside the A/C system electric box (see Figure 4-2). The controller

I/O module contains the software that manages the operating parameters of the A/C system.

Figure 4-2. Controller I/O module.

Controller I/O Module Layout

The controller I/O module contains the logic and input/output terminals. See Figure 4-2 for details of the controller I/O module

layout. The item numbers that follow coincide with the call-outs in Figure 4-2.

1. Connection (J10) for interface display panel

2. Connection for pLAN (J11)

3. Hatch for BMS or network card

4. Power on LED (Yellow)

5. Signal LEDs (Red, Yellow, Green)

6. Hatch for expansion I/O module(s)

7. Power connector (J1)

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