Digital Inputs; Analog Inputs - GE 469 Instruction Manual

469 Electrical Installation
Motor Management Relay
FIGURE 3–20: Wye Voltage Transformer Connection

Digital Inputs

There are 9 digital inputs designed for dry contact connections only. Two of the
digital inputs (Access and Test) have their own common terminal; the balance of the
digital inputs share one common terminal (see FIGURE 3–12: Typical Wiring
Diagram on page 3–9).
In addition, the +24 V DC switch supply is brought out for control power of an
inductive or capacitive proximity probe. The NPN transistor output could be taken to
one of the assignable digital inputs configured as a counter or tachometer. Refer to
Specifications on page 2–5 for maximum current draw from the +24 V DC switch
supply.
DO NOT INJECT VOLTAGES TO DIGITAL INPUTS. DRY CONTACT
CONNECTIONS ONLY.
CAUTION

Analog Inputs

The 469 provides terminals for four 0 to 1mA, 0 to 20mA, or 4 to 20mA current
input signals (field programmable). This current signal can be used to monitor
external quantities such as vibration, pressure, or flow. The four inputs share one
common return. Polarity of these inputs must be observed for proper operation The
analog input circuitry is isolated as a group with the analog output circuitry and the
RTD circuitry. Only one ground reference should be used for the three circuits.
Transorbs limit this isolation to ±36 V with respect to the 469 safety ground.
In addition, the +24 V DC analog input supply is brought out for control power of
loop powered transducers. Refer to Specifications on page 2–5 for maximum current
draw from this supply.
GE Multilin
3–16
http://www.GEindustrial.com/multilin