Connecting The Supply Voltage And Analogue Output - Sika Rcm 880 Betriebsanleitung

RCM 880 / 890

4.4 Connecting the Supply Voltage and Analogue Output

CAUTION
 Connect only voltage-free cables. Incorrect connection may result in damage
to the equipment or personal injury.
IMPORTANT
 Use ESD protective equipment during connection to avoid electrostatic dis-
charge.
The RCM 880 / 890 room condition monitor has an integrated, active 3-channel transmitter
that transmits the measured values as a current or voltage signal to your control system. The
connection options vary depending on the model:
RCM 880 / 890 without integrated galvanic isolation module
•
In this case the supply voltage and the analogue outputs are directly galvanically con-
nected. Interference may occur in EMC-impaired environments or with long cable runs.
As an alternative to direct connection, an additional DC/DC converter with galvanic isola-
tion or an isolation amplifier can be used.
RCM 880 / 890 with integrated galvanic isolation module
•
This variant offers integrated galvanic isolation in the direct connection. It is not neces-
sary to combine it with an additional galvanically isolated DC/DC converter. However, if a
passive output signal is required, or if intrinsically safe isolation is required, it is possible
to use an isolation amplifier for the analogue outputs.
Type
RCM 880 / 890 without integrated
galvanic isolation module
RCM 880 / 890 with integrated
galvanic isolation module
Connect the supply voltage and the analogue output in one of the following ways:
1. Direct Connection Without Integrated Galvanic Isolation Module (see section 4.4.1)
2. Direct Connection With Integrated Galvanic Isolation Module (see section 4.4.2)
3. Connection via an Additional Galvanically Isolated DC/DC Converter
(see section 4.4.3)
4. Connection via an Isolation Amplifier (see section 4.4.4)
Technical changes reserved
Installing and Connecting the RCM 880 / 890
Galvanic Isolation
No
Yes
Approved accessories
• DC/DC converter
• Isolation amplifier
Isolation amplifier
•
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