Alfalaval EPC-400 Bedienungsanleitung

Alfa Laval Marine & Power

EPC-400

Control Unit

P000681A

Product No.

Printed

Book No.

31830-6149-1

31830-6149-2

31830-6149-3

31830-6228-1

31830-6228-2

31830-6228-3

Nov 1998

1818053-02 V3

Component

Description

Alfa Laval reserve the right to make changes at any time without

prior notice.

Any comments regarding possible errors and omissions or

suggestions for improvement of this publication would be

gratefully appreciated.

Copies of this publication can be ordered from your local Alfa

Laval company.

Published by: Alfa Laval Marine & Power AB

S - 147 80 Tumba

Sweden

1818053-02

Contents

1 Overview 1

2 Function Description 3

2.1 Application 3

2.2 Working Principle 3

2.3 Design 4

2.3.1 Front Panel 4

2.3.2 Label Inside the Front Panel 5

2.3.3 Control Module 5

2.3.4 Power Supply 6

3 Operation 7

3.1 Process Operation 7

3.2 Parameter Setting 7

3.2.1 Overview 8

3.2.2 Setting Procedure 8

4 Maintenance 11

4.1 Preventive Maintenance 11

4.1.1 Lamp Test 11

4.2 Corrective Maintenance 12

4.2.1 Fuses and Related

Functions 12

4.3 Replacement of

Control Module 13

5 Technical Data 15

5.1 Specification 15

5.2 Dimensions 16

5.3 Circuit Diagram 17

6 Installation 19

6.1 Mounting 19

6.2 Cable Routing 20

6.3 Location of Cable Entries 20

6.4 Terminal Protectors 21

7 Spare Parts 23

1818053-02

1818053-02 1

1 Overview

EPC-400 control unit is used within a

separation system for automatic control of the

separation process.

The unit is microprocessor based and

comprises output functions for control of

ancillary equipment and input functions for

monitoring and alarm. The EPC-400 is

programmable to suit different separator

systems and different operation conditions.

The programming can easily be adjusted to

new conditions or new experience.

1 Overview EPC-400

21818053-02

1818053-02 3

2 Function Description

2.1 Application

The EPC-400 control unit is used in ALCAP

separation systems.

2.2 Working Principle

The EPC-400 is used for monitoring and

control of the separation process. It controls

starting, separation, sludge discharge and

stopping sequences.

The process is monitored via input signals

from sensors, etc., and an alarm is given if

preset values are exceeded.

The unit also contains a PI-controller for

temperature control which can operate an Alfa

Laval Heatpac electric heater or a steam

heater or any other heater with control valve

(for steam / hot water /thermal oil).

The control unit can be programmed for

different separator systems and for different

conditions within the system. The

programming is made by setting parameters,

such as type of equipment, temperature limits,

times, etc. Some parameters are set at

installation whilst process parameters are

easily accessible for adjustment during

operation.

2 Function Description EPC-400

41818053-02

2.3 Design

2.3.1 Front Panel

The front panel of the EPC-400 control unit

provides a display and LEDs (light emitting

diodes) for alarm and process information,

and push-buttons for on/off and manual

process control.

Four push-buttons are located to the right on

the panel. The upper three (1–3) are used for

process functions and the lower (4) is used for

alarm reset. The push-buttons are also used for

parameter selection and setting.

On and off functions corresponding to the

push-buttons are indicated on the LEDs (6–8)

above the display. The LEDs under the

display (9–10) are used for alarm indications.

The five digit display (11) shows process

information during operation and alarm codes

at certain alarms. It is also used for parameter

selection and setting.

The left part of the front panel contains two

rows of LEDs. The upper row (12) indicates

alarms. The alarm source is indicated on the

upper schematic diagram (13).

The LEDs in the lower row (14) indicate when

an output from the control unit is active. The

valve or other unit connected to each output is

indicated on the lower schematic diagram

(15).

The schematic diagrams can be replaced in

case of system changes or updates.

The front panel can be swung open like a door

by opening the lock (16) to the left.

G001145A

G001141A

1. Heater on/off push-button

2. Control program on/off push-button

3. Sludge discharge push-button

4. Alarm reset

5. Function symbols

6. LED for heater (green)

7. LED for control program running (green)

8. LED for stop sequence running (yellow)

9. LED for discharge failure (red)

10. LED for common main alarm (red)

11. Display

12. LEDs for alarm inputs (red)

13. Schematic diagram, alarm inputs

14. LEDs for output functions (green)

15. Schematic diagram, outputs

16. Door lock

EPC-400 2 Function Description

1818053-02 5

An on/off switch combined with a fuse is

located behind the front panel. The power is

intended to be permanently on. When work is

to be carried out in the control unit the mains

supply should be externally switched off.

2.3.2 Label Inside the Front Panel

A label on the inner side of the front panel,

serves as a quick reminder for parameter

setting in the EPC. It shows:

•the positions of the mode switch

•the connection between the display and

the push buttons

•the meaning of some parameters (P)

To make use of the label you must be familiar

with parameter setting, see section

“Operation” in this manual, and parameter

values, see the “Parameter List” manual.

2.3.3 Control Module

All electronic components are grouped on two

circuit boards which are mounted in a hinged

aluminium frame, forming an easily

accessible control module (1) inside the

cabinet. The module is fastened by two

screws, making it easy to remove and service.

Electrical output and input connections to the

module is made by cables terminated with

multi-plugs that fit into sockets on the circuit

board.

The front circuit board controls the operating

sequences. It holds the operating push-buttons

(5, 6), mode switch (3) and display segments

(4).

G001161AP000591A

1. Control module

2. Front circuit board

3. Mode switch

4. Display

5. Push buttons (for parameter setting)

6. Push buttons (for parameter selection)

F1–F3

Fuses

F11.Main switch/main fuse

X-. Terminals

2 Function Description EPC-400

61818053-02

It also contains built-in relays, which are used

e.g. for the output signals to ancillary

components, stop signal to the separator motor

starter and control signals to an optional

heater.

The rear circuit board (2b) monitors the water

transducer and coordinates the monitoring

with the operating sequences for the ALCAP

functions.

2.3.4 Power Supply

Inside the cabinet, behind the control module,

there is a mounting plate with terminals (XA),

power line filter (Z1) and a transformer (T1).

P000612A

1. Control module (folded out)

2b. Rear circuit board

F1, F2 fuses

F11 Main switch/main fuse

T1 Transformer

Z1 Power line filter

XA Terminals

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