External Dc Voltage Supply; Sensor Supply; Switching On / Off, Reinitialization - Ahlborn ALMEMO 2470-1S Operating Instruction

7. Power supply
bar indicates the approximate charge status. While the 3 green sections flash
left to right, the rechargeable batteries are being charged. As soon as all 3
sections remain green, the rechargeable batteries are fully charged; however,
the mains adapter can be left connected to the device. If standard non-re-
chargeable batteries are being used, the battery symbol will, as soon as the
mains adapter is connected, flash briefly in red. Standard non-rechargeable
batteries must not be subjected to recharging; charging must be terminated im-
mediately by pressing any key; the device will then be powered by mains only.

7.4 External DC voltage supply

The DC socket (3) can also be used to connect another DC voltage, 5 to 13 V
(minimum 200 mA). It can be connected using ALMEMO plug ZA1000-FSV. If,
®
however, the power supply has to be electrically isolated from the transducers,
then electrically isolated DC cable ZA 2690-UK must be used. It will then be pos-
sible to use the measuring instrument in a 12-volt or 24-volt on-board supply sys-
tem.

7.5 Sensor supply

At the terminals + (plus) and - (minus) in the ALMEMO plug there is a config-
®
urable sensor supply voltage available (self-healing fuse, 500 mA). The sensor
voltage supplied by the device is set automatically, depending on the minimum
supply voltage requirements of the sensors, 6V (400 mA), 9 V (300 mA), or 12
V (200 mA). (see Manual, Section 6.10.5) Other voltages (15 V, 24 V, or refer-
ences for a potentiometer and strain gauge) can also be obtained using special
plugs. (see Manual. Sections 4.2.5 and 4.2.6).

7.6 Switching ON / OFF, reinitialization

The key (6) is located in the middle of the keypad; to switch the
ON OFFr
device ON press briefly and release; to switch the device OFF press and hold
down. When the device switches OFF all saved values and settings are re-
tained intact. (see 7.7) While rechargeable batteries are being charged by a
mains adapter the device cannot be switched OFF (display ´ ´). To switch
noOFF
OFF in these circumstances the device will have to be disconnected. If inter-
ference (e.g. electrostatic) or a malfunction (e.g. battery failure) causes the
device to behave abnormally, it can be reinitialized. To activate a reset press
and hold down key FCT r when switching on - without mains adapter connected.
This will restore all settings - except the device designation - to factory default
status. Programming of sensors in the ALMEMO ® plugs will also remain unaf-
fected.
16 ALMEMO 2470