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61
Reference Manual
00809-0200-4728, Rev RA
Section 4: Electrical Installation
April 2015
Figure 4-3. Powering the Transmitter for Bench Configuration
Note
Signal loop may be grounded at any point or left ungrounded.
A Field Communicator may be connected at any termination point in the signal loop.
The signal loop must have between 250 and 1100 ohms load for communications.
Max torque is 6 in.-lbs (
0
/
7
N-m).
Load limitation
The power required across the transmitter power terminals is 12 to 42.4 Vdc (the power
terminals are rated to 42.4 Vdc). To prevent damaging the transmitter, do not allow terminal
voltage to drop below 12.0 Vdc when changing the configuration parameters.
4.3.3
Ground the transmitter
Sensor shielding
The currents in the leads induced by electromagnetic interference can be reduced by shielding.
Shielding carries the current to ground and away from the leads and electronics. If the ends of
the shields are adequately grounded, only a small amount of current will actually enter the
transmitter. If the ends of the shield are left ungrounded, voltage is created between the shield
and the transmitter housing and also between the shield and earth at the element end. The
transmitter may not be able to compensate for this voltage, causing it to lose communication
and/or go into alarm. Instead of the shield carrying the currents away from the transmitter, the
currents will now flow through the sensor leads into the transmitter circuitry where it will
interfere with the circuit operation.
644 Head Mount and Field Mount
644 Rail Mount
A. Power supply
B. Field Communicator
B
250
≤
R
L
≤
1100
A
Содержание Rosemount 644
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