ABB RET 541, Product Manual

Page: 33 / 68

Table 10: Digital inputs
Power supply version PS1/240 V (High) PS1/240 V (Medium),
PS2/240 V
PS1/48 V (Low),
PS2/48V
Input voltage, dc 220 V 110/125/220 V 24/48/60/110/125/
220 V
Nominal treshold voltage, dc
- operating range, dc 155 V
155…265 V 80 V
80...265 V 18 V
18...265 V
Current drain ~2…25 mA
Power consumption/input <0.8 W
Pulse counting (specific digital inputs),
frequency range 0…100 Hz
Time synchronization (specific digital
inputs) synchronization rate once per minute or once per second
Table 11: RTD/analog inputs
Supported RTD sensors 100

Platinum TCR 0.00385 (DIN 43760)
250

Platinum TCR 0.00385
1000

Platinum TCR 0.00385
100

Nickel TCR 0.00618 (DIN 43760)
120

Nickel TCR 0.00618
250

Nickel TCR 0.00618
1000

Nickel TCR 0.00618
10

Copper TCR 0.00427
120

Nickel TCR 0.00672 (MIL-T-24388C)
Max lead resistance
(three-wire measurement) 200

per lead
Accuracy ±0.5% of full scale
±1.0% of full scale for 10

Copper RTD
Isolation 2 kV (inputs to outputs and inputs to protective earth)
Sampling frequency 5 Hz
Response time

Filter time + 30 ms (430 ms...5.03 s)
RTD/ Resistance sensing
current max 4.2 mA RMS
6.2 mA RMS for 10

Copper
Current input impedance 274

±0.1%
Table 12: Analog outputs
Output range 0...20 mA
Accuracy ±0.5% of full scale
Max load 600

Isolation 2 kV (output to output, output to inputs and output to
protective earth)
Response time

85 ms
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
33
Table 13: Signal outputs
Max system voltage 250 V ac/dc
Continuous carry 5 A
Make and carry for 0.5 s 10 A
Make and carry for 3 s 8 A
Breaking capacity when control circuit time-constant
L/R <40 ms, at 48/110/220 V dc 1 A/0.25 A/0.15 A