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Device handbook SIRAX BM1450
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4.2.1 Possible cross sections and tightening torques
Terminals 1 … 14
Single wire: ≤ 4,0mm2 or multiwire with end splices: 2 x 1,5mm2
Torque: 0.5 … 0.6Nm rsp. 4.42 … 5.31 lbf in
Terminal A, B, G
Single wire: ≤ 1,5mm2 or multiwire with end splices: 2 x 0,75mm2
Torque: max. 0.5 Nm rsp. 4.42 lbf in
4.2.2 Inputs
All voltage measurement inputs must originate at circuit breakers or fuses rated by 1 Amps.
For safety reasons, the panel must be properly grounded in accordance with local regulations.
Vdc+
Vdc-
L N
AUX
SUPPLY
7 9
13 14
4 6
1 3
8 11
2
V+ V-
I1-
I1+
I2-
I2+
I3-
I3+
I4-
I4+
5
LO
AD 1
LO
AD 2
LO
AD 3
LO
AD 4
4.2.3 Power supply
A marked and easily accessible current limiting switch has to be arranged in the vicinity of the device for turning off the power
supply. Fusing should be 10 Amps or less and must be rated for the available voltage and fault current.
4.2.4 Modbus interface RS485
Via the optional Modbus interface measurement data may be provided for a superior system. However, the Modbus interface cannot be used for
device parameterization.
MASTER
+3.3 / +5V
Rx/Tx+,A
RS485 Bus
Rs
Rt
Rs
Rx/Tx-,B
GND
1)
Rt
A B G
A B G
A B G
1) One ground connection only. This is
possibly made within the master
(PC).
Rt: Termination resistors: 120 Ω each for
long cables (> approx. 10 m)
Rs: Bus supply resistors,
390 Ω each
The signal wires (A, B) have to be twisted. GND (G) can be connected via a wire or via the cable screen. In disturbed environments shielded
cables must be used. Supply resistors (Rs) have to be present in bus master (PC) interface. Stubs should be avoided when connecting the
devices. A pure daisy chain network is ideal.
You may connect up to 32 Modbus devices to the bus. A proper operation requires that all devices connected to the bus have equal
communication settings (baud rate, transmission format) and unique Modbus addresses.
The bus system is operated half duplex and may be extended to a maximum length of 1200 m without repeater.