Sargent EC155 User Manual

EC155 Power Control System

Issue 2 Page 1 of 11 June 2013

Important Version Identification

Please be aware that there are two revisions of the EC5x series control panels.

The older revision 1 panels have a green power LED and a black circuit board and are covered by the old
issue 1 instructions (see www.sargentltd.co.uk).

These issue 2 instructions only apply to the later revision 2 control panels which have a blue power LED
and a green circuit board.

1 Key Features

150W (~12A) combined Power Converter / Battery Charger - Converts the 230V mains supply into 12V
DC power to run the leisure equipment and charge the battery.

Low current switching reduces voltage drop in the circuit and improved circuit fusing provides better
protection for the harness and equipment.

Links to the EC5x series LED Control Panel to provide simple but intelligent control of the 12V
equipment and built in over discharge software protects the leisure and vehicle batteries.

2 System Overview

The following diagram shows the typical configuration of the EC155 system. The key component is
the EC155 power supply unit (PSU), which is the hub of the system and provides connectivity to the
ancillary components and the EC5x series control panel.

EC50 / 51 Control Panel

12v LEISURE

BATTERY

12v VEHICLE

BATTERY

12v

EQUIPMENT

230v

EQUIPMENT

230v

IN

SENSOR

INPUTS

Mains Control

Equipment

EC155 Power Supply Unit

150W

Charger /

Power Supply

Relay Module

EC51 Model Only

12v LEISURE

BATTERY

12v LEISURE

BATTERY

12v VEHICLE

BATTERY

12v VEHICLE

BATTERY

12v

EQUIPMENT

230v

EQUIPMENT

230vIN230v

IN

SENSOR

INPUTS

Mains Control

Equipment

EC155 Power Supply Unit

150W

Charger /

Power Supply

Relay Module

EC51 Model Only

EC155 Power Control System

Issue 2 Page 2 of 11 June 2013

3 Power Supply Details

For the safe operation of all electrical equipment within your Leisure Vehicle it is important that you
read and fully understand these instructions. If you are unsure of any point please contact your dealer
/ distributor for advice before use.

The following diagram shows the EC155PSU layout.

WARNING

Under heavy loads the EC155PSU case may become hot. ALWAYS ensure the ventilation slots have
a clear flow of air. Do not place combustible materials against / adjacent to the EC155PSU. The PSU

will shutdown if overheated and will restart automatically when cool.

3.1 Battery Charger / Power Converter

The EC155PSU incorporates a fixed voltage battery charger / power converter. The battery charger /
power converter also powers the leisure equipment when the mains supply is connected. This module
supplies 13.8V DC to the leisure equipment up to a maximum of 12 Amps (155 Watts), therefore the
available power is distributed between the leisure load and the battery, with the leisure load taking
priority as per the following example:

Leisure load Available power for battery charging

3A 9A

6A 6A

9A 3A

12A 0A

Power

Switch

RCD &

3 MCB’s

DC

Fuses

EC155 Power Control System

Issue 2 Page 3 of 11 June 2013

3.2 Residual Current Device & Miniature Circuit Breakers

The Residual Current Device (RCD) is basically provided
to protect the user from lethal electric shock. The RCD will
turn off (trip) if the current flowing in the live conductor
does not fully return down the neutral conductor, i.e. some
current is passing through a person down to earth or
through a faulty appliance.

To ensure the RCD is working correctly, the test button
should be operated each time the vehicle is connected to
the mains supply (see section 5.1)

The Miniature Circuit Breakers (MCB’s) operate in a similar
way to traditional fuses and are provided to protect the
wiring installation from overload or short circuit. If an
overload occurs the MCB will switch off the supply. If this
occurs you should investigate the cause of the fault before
switching the MCB back on.

The following table shows the rating and circuit allocation for the three MCB’s

MCB Rating Wire Colour Description

1 10 Amps White 230V Sockets

2 10 Amps White (Yellow for heater) Extra 230V Sockets / Heater

3 6 Amps Black (Blue for water heater) Fridge / Water Heater / 12V Charger

(internally connected)

3.3 Fuses

WARNING

When replacing fuses always replace a fuse with the correct value. NEVER replace with a higher value /

rating as this could damage the wiring harness. If a replacement fuse ‘blows’ do not keep replacing the

fuse as you could damage the wiring harness. Please investigate the fault and contact your dealer.

The following table shows the fuse allocation for the 12 fuses fitted to the EC155PSU.

Fuse Rating Fuse Colour Wire Colour Description

1 15 Amps Blue Red / Yellow Fridge (none compressor type)

2 10 Amps Red Grey Front Lights

3 5 Amps Tan Yellow/Green Hob and Heater Igniters Supply

4 10 Amps Red Green / Blue Water Pump / Toilet

5 10 Amps Red Black/Blue Ventilation Fans

6 10 Amps Red Pink Rear Lights

7 10 Amps Red Yellow / White 12V Sockets / TV Amplifier / Entertainment

8 5 Amps Tan Brown / Yellow Permanent Supply (Radio / Fridge)

9 20 Amps Yellow Brown / Green Vehicle Battery

10 20 Amps Yellow Brown / Blue Leisure Battery

11 10 Amps Red Black/Red Heater Fan

12 15 Amps Blue ---- Charger

The following table shows details of the fuse(s) located at the Leisure battery.

Battery 1 20 Amps Yellow Brown / Blue Fuse remotely located near battery

Test

Button

RCD MCB’s

EC155 Power Control System

Issue 2 Page 4 of 11 June 2013

3.4 Battery

A) Type / Selection

For optimum performance and safety it is essential that only a proprietary brand LEISURE battery is
used with a typical capacity of 75 to 120 Ah (Ampere / hours). A normal car battery is NOT suitable.
This battery should always be connected when the system is in use.

The EC155PSU is designed to charge standard lead acid leisure batteries, however it may be used
with Gel batteries depending on their composition. Please consult the battery documentation for
further advice.

The battery feed is fitted with an inline fuse between the battery and the electrical harness, and is
usually located immediately outside the battery compartment or within 500mm of the battery. The
maximum rating of this fuse is 20A per battery.

B) Installation & Removal

Always disconnect the 230V mains supply and turn the EC155PSU charger switch to the OFF (0)
position before removing or installing the battery.

When connecting the battery, ensure that the correct polarity is observed (black is negative [-] and red
is positive [+]) and that the terminals are securely fastened. Crocodile clips must not be used.

WARNING

Explosive gases may be present at the battery. Take care to prevent flames and sparks in the vicinity

of the battery and do not smoke.

C) Operation / Servicing

Under normal circumstances it should not be necessary to remove the battery other than for routine
inspection of the terminals and “topping up” of the battery fluid where applicable. Please see
instructions supplied with the battery.

Note: Do not over discharge the battery. One of the most common causes of battery failure is when
the battery is discharged below the recommended level of approximately 10V. Discharging a battery
below this figure can cause permanent damage to one or more of the cells within the battery.

To prevent over discharge, the EC155PSU in conjunction with the EC5x series control panel
incorporates a battery protect circuit that warns and then disconnects the batteries when they fall
below the following conditions:

Battery

Voltage

cut off

Action after cut off Notes

Vehicle 10.9V

Battery selection is

changed from Vehicle

battery to Leisure

battery. If the leisure

battery is below 9v
then a further warning
will occur (see below).

This cut off level is designed to protect the vehicle

battery from over discharge. The 10.9V level

ensures there is sufficient power in the battery to

run the vehicle electronics and start the vehicle.

This cut off only applies to power drawn from the

battery by the leisure equipment; it will not protect

the battery if you leave the vehicle lights on.

Leisure 9V Power is turned off

This is an emergency cut off level to protect the

battery from severe damage. You should not rely

on this cut off level during normal operation, but

manage your power consumption to a discharge

level of 10V.

This cut off only applies to power drawn from the

battery by the leisure equipment that is controlled

by the control panel power switch; it will not protect

the battery from discharge by the radio or other

permanently connected equipment.

Note: the system also incorporates an over voltage cut-out which turns the system power off if either
battery voltage exceeds 15V (indicated by the level display top LED flashing).