Power Measurement At A Machine - Beckhoff EL34 Series Documentation

Application examples
7.2

Power measurement at a machine

WARNING: Risk of electric shock!
Bring the Bus Terminal system into a safe, voltage-free state before starting mounting, disassembly or
wiring of the Bus Terminals!
Attention! Risk of device damage!
Avoid confusing the current and voltage circuit during connection, since the direct connection of mains volt-
age to the terminal points for the current transformers (typical input resistance 100 mΩ) would destroy the
power measurement terminal!
EL3443
• The voltage is measured via connections L1, L2, L3 and N.
• The current is measured via three current transformers [} 29] and the connections I
point of the current transformers).
Fig. 163: EL3443, power measurement at a machine
Negative power values
If negative power values are measured on a circuit, please check whether the associated current
transformer circuit is connected correctly.
EL3453
• The voltage is measured via connections L1, L2, L3 and N.
• The current is measured via 4 current transformers [} 29] and the connections I
point of the current transformers).
262
WARNING
NOTE
Version: 1.5
, I , I and I (star
L1 L2 L3 N
, I , I and I (star
L1 L2 L3 N
EL34xx