3
Functional Description
3.1
Instrument Construction
SMC 144
Power Analyzer
ETH
N
L1
L2
L3
L4
l1 k1 l2 k2 l3 k3 l4 k4
X1
X2
O-
O+
R A1 A2 G B
A
G B/1 A/2
COM1
COM2 / DI
1
2
3
4
5
6
7
8
9
Figure 11: Description of the SMC 144 instrument.
1. Input connector for auxiliary power supply voltage
2. Galvanically isolated digital relay or impulse output (optional)
3. Green instrument status LED
4. Two red configurable alarm LEDs
5. Primary communication RS-485 interface
6. Secondary RS-485 of M-Bus interface (optional) or two digital inputs (optional)
7. RJ-45 ethernet connector (optional)
8. Current inputs for externally connected current sensors
9. Voltage inputs for four measured voltages
3.2
Control
SMC 144 device has no control buttons. It simply works while connected to proper auxiliary voltage (see
Technical specifications). Communication using ENVIS software on your PC, which is the only way, how to
control SMC 144 device, was described in chapter 2.
3.2.1
Machine Status
SMC 144 can be in one of three basic states indicated by green LED. Function of green LED in conjunction with
10 seconds power-up interval and fixed baud rate communication was previously described in 2.2.1.
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