WEG SRW 01, User Manual

Page: 33 / 148

Installation and Connection
SRW 01 | 3-5
3
ATTENTION!
It is essential that all motor supply conductors that cross the windows of the Current/Voltage
Measurement Unit (UMCT) have the direction indicated in
Figure 3.3 on page 3-4 , seeing that the
input terminals (power supply line) are identified as L1, L2 and L3 and the output terminals (motor) are
identified as T1, T2 and T3.
When using the Current/Voltage Measurement Unit (UMCT), it is possible to monitor the voltage of the power
supply line (power), even with the motor Off. Connect the terminals of the power supply L1, L2 and L3 (or L1 and
L2, for single-phase loads) – after passing by the protection circuit (circuit breakers or fuses) – to the connection
terminals L1, L2 and L3 (or L1 and L2, for single-phase loads) of the Current/Voltage Measurement Unit (UMCT).
Observe the correct connection between the terminals ( L1
→ L1, L2 → L2 and L3 → L3).
ATTENTION!
If the connection T2 - L3 is used with a single-phase motor, then the SRW 01 earth fault protection
will actuate.
3.5 CURRENT MEASUREMENT UNIT (UMC) CONNECTION
The SRW 01 has 6 current measurement units:
„
UMC1 (0.5 – 5 A)
(*)
„
UMC2 (1.25 – 12.5 A)
„
UMC3 (2.5 – 25 A)
„
UMC4 (12.5 – 125 A)
„
UMC5 (42 – 420 A)
„
UMC6 (84 – 840 A)
(*) For the 0.25 -2.5 A range the UMC1 (5 A) with 2 turns in the primary must be used, according to the Figure
3.4 on page 3-5 .
Figure 3.4: 0.25 to 2.5 A current range connection - two turns in the UMC1
The Current Measurement Unit (UMC) or Current/Voltage Measurement Unit (UMCT) is connected to the Control
Unit (UC) by means of a ribbon-cable with a maximum length of two meters (check the cable models in the catalog
available for download on the website
www.weg.net ).
The Current Measurement Unit (UMC) measures the current of the 3 motor phases. The RMS current value of
each phase is transmitted digitally to the Control Unit (UC).
The Control Unit (UC) signalizes through the status led and the “E0085” HMI message, if the Current Measurement Unit
(UMC) or Current/Voltage Measurement Unit (UMCT) is not communicating with the UC.