Fema B RTU Series, User Manual, Page: 9 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
9
1.10 Power connections and protective earth
1. Unscrew the screws from the back cover and remove the
back cover (see section 1.8).
2. Pass the power cable through the power cable gland
(see
section 1.7).
3. Prepare the power cables so that the earth wire is 20 cm
longer than the other cables
(see Figure 1).
4. Connect the earth wire to the internal fixed screw ‘PE’
(see Figure 2)
located at the inside of the back cover. The
instrument internally connects the back cover metallic
Phase (+)
Neutral (-)
Earth
20 cm
Figure 1 - Longer earth wire
Power cable gland
Screws
‘PE’ internal fixed screw
Figure 2 - Location of the internal ‘PE’ fixed screw and power cable gland
structure with the front metallic structure through an in -
ternal green-yellow cable.
(dotted cable at Figure 3).
5. Connect phase and neutral (in AC power) or positive and
negative (in DC power) to the internal power terminal.
6. The connections label attached to the outside of the in -
strument has some free space left to write the color or
local code for each cable.
7. To comply with security regulation 61010-1, add to the
power line a protection fuse acting as a disconnection
element, easily accessible to the operator and identified
as a protection device.
Power ‘H’ 500 mA time-lag fuse
Power ‘L’ 1000 mA time-lag fuse
Power Terminal
(orange)
N L
PE
PE
fuse
Figure 3 - Power connections
1. Unscrew the screws from the back cover and remove the
back cover
(see section 1.8).
2. Locate the input signal terminal
(see section 1.7).
3. Pass the signal cable through the signal cable gland (see
section 1.7).
4. Connect the input signal cables
(see Figure 4)
.
5. The connections label attached to the outside of the in -
strument has some free space left to write the color or
local code for each cable.
1.11 Input signal connections
B
A
2 3
GND
Input Signal
1
A RS-485 A wire
B RS-485 B wire
GND Shield
Figure 4 - Signal connections
The 4 pin terminal located beside
the input signal module allows to
replicate a remote version of the
front keypad. Connect 4 cables
for front keys ‘SQ’ (
<
), ‘UP’ (
5
)
and ‘LE’ (
3
) and for the com -
mon. Pass these cables through
the ‘remote keypad’ cable gland
(see section 1.7) .
GND
SQ
UP
LE
1.12 Connections for remote keypad