CM572-DP 1SAP170200R0001 ABB Communication module robot drive

Description

CM572-DP Terminals A1 (+) and A2 (–) are provided for the input of a current signal, from one of the

following: 0 to 1 mA, 0 to 5 mA, 0 to 20 mA, or 4 to 20 mA transducer outputs. This current

signal can represent any external quantity, such as temperature, CM572-DP current or voltage. Be

sure to observe polarity markings for correct operation. Both terminals are clamped to

within 36 volts of ground with surge protection. As such, common mode voltages should

not exceed this limit. Shielded wire, CM572-DP with only one end of the shield grounded, is

recommended to minimize noise effects. The A2 (–) terminal must be connected to the A5

(analog output common) terminal at the 745.

3.2.10 Tap Position Input

Terminals A3 (+) and A4 (–) are provided to monitor the position of an onload tap changer

from a stepped-resistance position indicator device. Terminal A3 is connected internally to

a 4.3 mA current source. This current is used to measure the value of the external

resistance. The 745 uses the measured resistance value to calculate the tap position. See

Dynamic CT Ratio Mismatch Correction on page 5–6 for more details on the tap position

input.

The maximum total resistance the tap CM572-DP changer input can measure is 5.1 kΩ. For example,

the maximum resistance increment per tap for a 33-position tap changer should not

exceed 151 Ω.

3.2.11 RTD Driver/Sensor

Terminals B10 (RTD hot), B11 (RTD compensation) and B12 (RTD return) provide for the

connection of various types of RTD devices. This connection may be made using two or

three wires to the RTD. Terminal B10 is connected internally to a 5 mA current source for

energizing the RTD. Terminal B11 is connected internally to a 5 mA current source for the

purpose of cancelling out the resistance of the wires connecting the RTD to the 745.

Terminal B12 is the return path for the two CM572-DP current sources.

In the three-wire connection scheme, the connection from terminal B11 to B12 is made at

the RTD. The three-wire connection scheme compensates for the resistance of the wiring

between the 745 and the RTD.

In the two-wire connection scheme, the connection from terminal B11 to B12 is made at

the terminal block on the rear of the 745. This connection must not be omitted. The two

wire connection scheme does not compensate for the resistance of the wiring between the

745 and the RTD.

3.2.12 Output Relays

Eight output relays are provided with the 745. Output relays 2 through 5 have form-A

contacts while output relays 6 to 8 and the self-test relay, have form-C contacts. Since

output relays 2 to 5 are intended for operating a breaker trip coil, the form-A contacts have

higher current ratings than the form-C contacts. Note that the operating mode of the self

test relay is fixed, while the other relays can be assigned through the Protection Elements

menu, or programmed by the user via the FlexLogic™ feature.

A high-speed solid state (SCR) output is also provided. This output is intended for

applications where it is necessary to key a communications channel.

3.2.14 Analog Outputs

The 745 provides 7 analog CM572-DP output channels whose full scale range can be set to one of the

following ranges: 0 to 1 mA; 0 to 5 mA; 0 to 10 mA; 0 to 20 mA; and 4 to 20 mA. Each analog

output channel can be programmed to represent one of the parameters measured by the

relay. For details, see Analog Outputs 1 to 7 on page 5–43.

As shown in the typical wiring diagram, the analog output signals originate from Terminals

A6 to A12 and share A5 as a common return. Output signals are internally isolated and

allow connection to devices which sit at a different ground potential. Each analog output

terminal is clamped to within 36 V of ground. To minimize the effects of noise, external

connections should be made with shielded cable and only one end of the shield should be

grounded.

If a voltage output is required, a burden resistor must be connected at the input of the

external measuring device. Ignoring the input impedance, the burden resistance is:

(EQ 3.1)

If a 5 V full scale output is required with a 0 to 1 mA output channel, RLOAD = 5 V / 0.001 A =

5 KΩ. Similarly, for a 0 to 5 mA channel this resistor would be 1 KΩ; for a 0 to 10 mA

channel, this resistor would be 500 Ω; and for a 4 to 20 mA channel this resistor would be

250 Ω.

Details: If you need urgent delivery orders, please feel free to contact us, and we will try our best to meet your needs.
Price problem: If you find that other suppliers offer cheaper prices for the same product, we are also willing to provide you with reference prices and give you further discounts.
Contact us:+86 180 6092 3929
Mail: 2235954483@qq.com
Contact: Chen