ABB REF 542plus, Operator'S Manual, Page: 75 / 134

75
Connector Meaning
X72 Mainmodule RS232 service or debug interface
X73 HMI connection
X74 Time synch input
X75 HSTS Input
X76 HSTS Input
X77 HSTS Output
X80 Analog inputs
X81 Sensor 1
X82 Sensor 2
X83 Sensor 3
X84 Sensor 4
X85 Sensor 5
X86 Sensor 6
X87 Sensor 7
X88 Sensor 8
19.1. Analog Inputs
REF 542plus can have a maximum of 8 analog input channels. These inputs are
divided into three measurement groups:
*
Measurement Group 1: channel 1, channel 2, channel 3
*
Measurement Group 2: channel 4, channel 5, channel 6
*
Measurement Group 3: channel 7, channel 8
Group 1 and group 2 have to be homogeneous, which means they can measure 3
currents or 3 voltages. For example, measurements of 1 current and 2 voltages are
not allowed.
Group 3 can get any type of signals: 2 currents, 2 voltages, 1 current and 1 voltage
and so on. Group 1 and group 2 can be used for homogeneous current or voltage
measurements both from instrument transformers and non-conventional sensors.
Group 3 can be used in a heterogeneous way.
Channel 7 and 8 in group 3 can be used for earth-fault current with CT type input;
residual voltage, or for the synchrocheck function with VT or sensor type input.
The input CT 0.2A is commonly used with a toroidal transformer for sensitive earth-
fault current measurement.
Instrument current transformers can have secondary windings ratio /1 A or /5 A. The
primary nominal current (for example 400 A) is selected with the Operating Tool.
The secondary current (for example /5 A) is automatically selected connecting the
right wire to the analog input module.
Multifunction Protection and Switchgear Control Unit
Operator's manual
REF 542plus REF 542plus
1MRS755869