Driving High Current Loads; Fig. 5-28: Driving High Current Loads - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

NGA 2000 MLT Hardware
INSTALLATION
WIRING SIGNAL TERMINALS: DRIVING HIGH CURRENT LOADS
5.5.4

Driving High Current Loads

Loads with currents exceeding the rated currents specified for MLT analyzers outputs must not be
driven directly by digital or relay outputs.
Driving such loads requires external relays acting as decoupling devices: The MLT output drives
the external relay, which itself drives the load.
It is recommended to use separate supplies for analyzer and high current loads to minimize
interferences (fig. 5-28).
As described before using suppressor diodes for inductive loads is strongly recommended!
5 - 36
External relay

Fig. 5-28: Driving High Current Loads

Load
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006