Version: TCM_0450_E80_M_EN_150209_E007
28
Installation
Terminal
Description
5
Frequency output, active, referred to pin 8
6
Status output, active, referred to pin 8
7
Control input, active
“high”, referred to pin 8
8
Ground potential for digital I/O- pins.
The frequency and control outputs are active push-pull outputs with an output resistance of 220
Ω
. They can be
loaded to the positive supply or to ground. For a high output swing the load resistors Rload should not be lower
than 1 k
Ω
.
In case of a load resistor to ground the output voltages are:
V
high
= V
supply
* R
load
/ (220
Ω + R
load
)
V
low
< 1 V
In case of a load resistor to the positive supply the output voltages are:
V
high
> V
supply
– 1 V
V
low
= V
supply
- V
supply
* R
load
/ (220
Ω + R
load
)
The control input requires a high voltage of minimum 6.5 V and a minimum input current of 0.1 mA.
The ground terminals 8 and 51 are internally connected together.
Ground and protective ground are internally connected via a 1
kΩ resistor. The resistor will thermally withstand
a potential difference of up to 30 V between PE and GND but for proper operation this difference should be
limited to 5 V.
3.2.5.
Connecting the Analog Outputs
The TCE 8000 provides two independent passive
4…20 mA current loops CURRENT 1 and CURRENT 2.
The current loops are isolated from each other and from the power supply.
For operation an external supply of
8…30 V (nominal 24 V DC) is required.
The minimum voltage between terminal 1 and 2 or 3 and 4 respectively is 8 V.
The minimum load resistance is 0
Ω, the maximum is determined by the supply voltage.
At a given supply voltage the maximum load resistance can be calculated as:
R
load
(max) = (V
supply
– 8 V) / 22 mA
For +24 V minus 10% supply this gives a maximum value of 620
Ω.
With a given load resistance, the minimum supply voltage can be calculated as:
V
supply
(min) = 8 V + R
load
* 22 mA
