Applying The Measuring Current - Siemens SENTRON PAC3120 Manual

5.5

Applying the measuring current

The device is designed for connection of current transformers with secondary currents of 1 A
and 5 A. It is only possible to measure alternating currents.
The current measuring inputs can each be loaded with 10 A continuously or with 100 A for
1 s.
Open transformer circuits will result in electric shock and arc flash hazards.
Will cause death, serious personal injury, or equipment damage.
It is only possible to measure the current with external current transformers. Do not use
fuses for circuit protection. Do not open the secondary circuit of the current transformers
under load. Short circuit the secondary current terminals of the current transformer before
removing this device. Follow the safety instructions for the applied current transformers.
NOTICE
Alternating current measurement only
Use the device to measure alternating current only.
Direction of current flow
Please take account of the direction of current flow when connecting the current measuring
inputs. With inverse connection, the measured values are inverted and receive a negative
sign.
To correct the direction of current flow, it is not necessary to reverse the input terminals.
Instead, change the interpretation of the direction in the device settings.
You will find information about device settings in chapter Basic parameters (Page 72).
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
DANGER
Commissioning
5.5 Applying the measuring current
59