2481

2481

• embase PAR sur CI 9244

Description

The relay 2481 is a measuring instrument for the direct voltage and current supplied by a battery pack. It is made to check the charge and the discharge of the batteries.

Dimensions

Connection

Operation principle

FIVE FUNCTIONS ARE PROVIDED BY THIS RELAY :

1. Measure and display of the battery voltage :

- LCD display with 4 digits and 1/2 - 20.000 points.
- Display shape :
  * for 210 V : ###.#
  * for 24/28/110 V : ###.##
- Display accuracy :
  * 16 to 70 V : +/- 0,1 V
  * 70 to 250 V : +/- 0,2 V
  * 170 to 250 V : +/- 0,5 V
- The LCD display is guaranteed in the range 0 to 70°C
- the display and the voltage and current relays should not give false data in the range between the discharge end and 30% of the nominal value.

2. Detection of the discharge end voltage:

- Voltage threshold relay, set by multi-revolution potentiometer with access by screwdriver from the box outside.
- Setting ranges :
  * 26 to 33 V : 19,5 to 30 V
  * 38 to 53 V : 34 to 52 V
  * 100 à 137 V : 84 à 131 V
  * 190 to 250 V : 150 to 243 V
- Output relay : 2 dry inverters
- Relay 1813 directly soldered on the PCB
- Relay OFF for voltage < threshold
- A LED on front face displays the relay state. This LED is in series with a NC contact.
- Escape rate < 1,12
- Threshold accuracy : +/- 0,5% of the setting.

3. Detection of the discharge beginning :

- The discharge current detection id made with a 100 mV shunt in series with the battery. The threshold is set in factory at 10 mV.
- Detection circuit holds 2 V during 1 sec.
- Output relay : 2 dry inverters
- Relay 1813 directly soldered on the PCB.
- Relay ON for U shunt > 10 mV
- A LED in front face displays the relay state. this LED is in series with a NO contact
- Escape rate < 0,8
- Threshold accuracy : +/- 0,5% of the setting
- The relay is ON after a time delay of 120 sec. (+/- 15%). Time delay modifiable in factory.
- Time delay repetitiveness : +/- 5%.

4. Auto-test :

- the relay 2481 sends a current of some mA through the shunt. Then an electronic threshold circuit permits to detect if the current checking circuit is correctly connected.
- In case of link breaking, the discharge beginning relay is ON after a time delay of 2 min.
(So the discharge beginning relay has two functions : discharge current detection and checking of the link between shunt and 2481 relay).

5. Test of the switching relays and the voltage threshold :

Relays test :
A push-button "discharge end" permits to de-energise the related relay. A push-button "discharge beginning" permits to energise the related relay.

Voltage threshold test :
2 EXT + and - terminals permit to connect a power supply equal to the 2481 range (between 50 ad 100% of the power supply setting). This power supply energises a relay which switches the measure circuits on this one. It permits to check the LCD display and the threshold (and, if necessary, its setting).

Technical features

Coil data

Versions

Voltage ranges :

- 26 à 33  V
- 38 à 53 V
- 100 à 137 V
- 190 à 250 V