Daikin EWTP400MBYN — функциональное описание цифрового контроллера для больших чиллеров [309/452]

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ESIE 05-07 The Digital Controller For Large chillers

Part 2 – Functional Description 2–113

4.4 What happens in Case of an Alarm or a Warning?

Introduction The units are equipped with four kinds of safety devices: unit safeties, circuit safeties, network safeties

and dual pump safety.

For a full list of all possible safeties reffer to overview of fault indications and safeties on page 3-9.

Overview safeties

Remark: How to view the safeties:

Press the

p key when the alarm is activated.

The appropriate safety screen with the basic information appears. Press the q key to see

the detailed information.

If more than one kind of safety is active (indicated by means of ^, v or ÷), use the

g and

h keys to consult them.

Unit safety Description

Safety possible

if unit is off?

1. Inlet Condenser sensor error +Err / -Err read-out by sensor Y

2. Inlet Evaporator sensor error +Err / -Err read-out by sensor Y

3. Reverse phase protector Safety is activated if digital input is closed Y

4. Flow stopped Safety is activated if digital input is longer

open then 5 seconds

Circuit safety Description

Safety possible

if unit is off?

1. Outlet Evaporator sensor error +Err / -Err read-out by sensor Y

2. General module safety Safety is activated if digital input is

opened

3. Freeze-up module safety Safety is activated if digital input is closed Y

Network safety Description

Safety possible

if unit is off?

1. PCB Communication problems Safety is activated if network status is

not OK. (Only possible if a network of

different controllers exist)

Dual pump safety Description

Safety possible

if unit is off?

1. Flow stopped Safety is activated if digital input is

longer open then 5 seconds

ESIE05-07.book Page 113 Wednesday, October 11, 2006 10:42 AM