Endress+Hauser Proline Promass E TB2 HART, Руководство по эксплуатации

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Proline Promass E TB2 HART Electrical connection
Hauser 27
8.
NOTICE!
Housing degree of protection voided due to insufficient sealing of the housing. Screw
in the thread without using lubricant. The cover threads are coated with a dry lubricant.
Screw the connection compartment cover closed and tighten the securing clamp.
To remove a cable from the terminal, use a slotted screwdriver to push the slot between the
two terminal holes while simultaneously pulling the cable end out of the terminal.
mm (in)
≤ 3 (0.12)
2 1 3 4
A0013835
7.2.2 Connecting to the supply unit
Requirements for the supply unit
Supply voltage
Order version,
output
U
S
*
(supply voltage)
I
max
(output current)
8E2B**-** C ******** 18 to 30 V DC 22.0 mA
*
Supply voltage range without load. For information on the supply voltage with a load (
®
ä 27)
Load
Minimum terminal voltage
Depending on the current value, the following minimum values for the terminal voltage (U
ter
) must
be observed:
• For 22 mA: U
ter
³
14 V
• For 3.6 mA: U
ter
³
18 V
Calculation of the maximum load
The following dependencies on the external supply voltage (U
S
) apply when calculating the
maximum permitted load (R
B
) including a power resistor for the HART protocol:
• For U
S
= 18 to 18.8 V: R
B
£
(U
S
- 18 V)
:
3.6 mA
• For U
S
= 18.8 to 25 V: R
B
£
(U
S
- 14 V)
:
22 mA
• For U
S
= 25 to 30 V: R
B
£
500
W
Sample calculation
For U
S
= 19.5 V, the maximum load is: R
B
£
(19.5 V - 14 V)
:
22 mA = 250
W