Bedienungsanleitung Graupner Ultramat 17 (Seite 18 von 33) (Deutsch, Englisch, Französisch)

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13. User settings

Initial power-on program

NiCd delta-peak (-

∆∆

∆

peak) trigger voltage

___________ _____

power-on program

NiCd automatic

DECINC

You can select the charge program which is to be activated

automatically when the charger is connected to the car batte-

ry. The following charge programs are available: NiCd-

manual, -automatic, NiMH-manual, -automatic, LiIo manual

and Pb-manual, -automatic.

The charger monitors the charge curve and assesses the peak, or maximum point, on the curve. This

indicates extremely accurately when the battery is fully charged.

When a battery is placed on charge, its voltage initially rises continuously; however, when the battery

is full the cells’ temperature rises, and this causes a slight reduction (DV) in the battery voltage. The

charger detects and measures this drop. It is possible to adjust the sensitivity, or trigger voltage (in

mV per cell!) of the automatic termination circuit for NiCd batteries. A practical range has proved to be

10 ... 30 mV / cell. If the trigger voltage is set higher, there is a danger of overcharging the battery; if set

lower, there is a danger of premature termination. We recommend that you carry out a series of test

charges to establish the ideal trigger value for your batteries.

NiMH delta-peak (-

∆∆

∆

peak) trigger voltage

___________ _____

NiMH delta-peak-

voltage = 15mV

DEC

INC

It is possible to adjust the trigger voltage (in mV per cell!) of

the automatic termination circuit for NiMH batteries. Howe-

ver, compared with NiCd cells NiMH batteries have a less

pronounced voltage drop, and a practical range has proved

to be 5 ... 25 mV / cell. If the trigger voltage is set higher, there

is a danger of overcharging the battery; if set lower, there is a

danger of premature termination. We recommend that you

carry out a series of test charges to establish the ideal trigger

value for your batteries.

cell voltage

charging time

Initial-

program

NiCd

NiMH

Lithium

NiCd -

∆∆

∆ Peak

- 10 mV

- 30 mV

NiMH -

∆∆

∆ Peak

- 5 mV

- 25 mV

Car battery

cut-off

- 10,5 Volt

- 11.8 Volt

Button click

OFF

-ON

Summer

OFF - 10 sec.

- no limit

max.

current

N iC d 0,1... 5A

NiMH 0,1... 5A

Pb 0,1... 5A

MODE

User

settings

MODE MODE MODE MODE MODE

MODEMODEMODEMODE

NiCd / NiMH

safety

timer

10 ... 300 min.

NiCd / NiMH

charge termin-

delay

AUS,

0...9 min.

MODE

Erase

user

settings

**erased**

Initial

current

N iC d 0,1... 5A

NiMH 0,1... 5A

Lith. 0,1... 5A

Pb 0,1... 5A

or automatic-current

Pb capacity test program

Pb discharge program

Pb trickle charge current

___________ _____

Pb capacity

C:2.5A D:2.5A

DECINC

ENTER

___________ _____

Pb discharge

2.5A 10.8V

DECINC

DEC

INC

ENTER

___________ _____

Pb trickle chg.

current 100mA

DECINC

The typical purpose of this program is to determine the residual

capacity of a drive battery.

In this program the charger discharges the pack using the set

discharge current (0.1 ... 3.0 A or automatic) until its voltage falls

to the set final discharge voltage (0.5 ... 37.0 V or automatic).

To obtain a realistic capacity reading, i.e. one which actually

reflects the battery’s condition, the discharge current should be

set substantially below 1C (capacity of the battery = 2 Ah —> C

= 2 A), and the final discharge voltage should be set to around

1.55 V per cell.

This program determines the capacity of a lead-acid battery.

The program first charges the battery using the set charge cur-

rent stated on the left of the screen (0.1 ... 5.0 A), and then

discharges it again using the set discharge current stated on

the right of the screen (0.1 … 3.0 A). At the end of the process

the screen displays the battery’s capacity.

The recharge phase exploits the unit’s ability to select and redu-

ce the charge and discharge current and voltage automatically,

as described previously for the Pb manual program.

During the discharge phase the battery is discharged at the

current you have selected. To obtain a realistic capacity reading

the discharge current should not be above 1C (capacity of the

battery = 2 Ah —> C = 2 A).

Lead-acid batteries exhibit slightly lower charging efficiency than

NiCd or NiMH batteries, so you should not be surprised if the

useful capacity of the battery only amounts to 60 to 70% of the

charged-in capacity.

When a Pb charge program is used and the battery reaches the

final charge voltage, the charger automatically switches to mainte-

nance mode, i.e. trickle charging.

In trickle mode the charger automatically reduces the final char-

ge voltage to around 2.2 to 2.3 V per cell, which effectively

prevents excessive gassing of the battery even if it is left on

charge for a fairly long time.

This menu is purely for setting the trickle charge rate, and has no other independent function.

In the final stage the charger automatically continues to charge

the battery at the current set in the menu “Pb - trickle charge

current” until you disconnect it from the charger. During this

period the screen displays the letter “T” instead of the charge

current to indicate that it is trickle charging.

___________ _____

Pb-Man. 226:

*T* 03627 7.21

The screen displays the message “MAX.”, alternating with the reduced charge current to indicate that the

charger is limiting the current.

The ULTRAMAT 25 now charges the battery using the maximum possible current until its voltage rises to

around 2.3 to 2.35 Volts per cell. The charger then switches to a lower current to bring the battery gently

up to full charge; this process reliably fills the battery “to the brim”.

The unit cuts off the charge process automatically when the battery reaches a voltage of around 2.45 to

2.5 Volts per cell. The effect of the automatic charge current adjustment system is to complete a full charge

safely in much less than the usual 14 to 16 hours.

___________ _____

NiCd delta-peak-

voltage = 20mV

DEC

INC

The automatic charge termination cir-

cuit (“battery full” detection) works on

the principle of the Delta Peak process;

this method, sometimes known as the

Delta-U or Delta-V process, has pro-

ved its worth in millions of battery char-

gers over many years.

Graupner Ultramat 17 Seite 18

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