Siemens SENTRON PAC4220 - 5.5 Applying the Measuring Current

5.5 Applying the measuring current
The device is designed f
or 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
second.
DANGER
Open transformer circuits will result in electric shock and arc 󹪞ash hazards
W
ill cause death, serious injury or property 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.
• The safety information for the current transformers used must be followed.
NOTICE
Alternating current measurement only, otherwise the device will become non-functional
Use the de
vice to measure alternating current only.
Direction of current 󹪞ow
Please t
ake account of the direction of current 󹪞ow 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 󹪞ow, it is not necessary to reverse the input terminals.
Instead, change the interpretation of the direction in the device settings.
You will 󹪝nd information about device settings in the Basic parameters (Page81) section.
See also
Safety information (Page43)
Measuring inputs (Page21)
Commissioning
5.5Applying the measuring current
PAC4220
Equipment Manual, L1V30827278B-01 63