Azbil ALTJ 9000 Series, Руководство пользователя, Страница: 22 / 68

4-2
Chapter 4 Electrical Wiring
„
Wiring
This device uses a 2-wire system. The power supply wire also serves as a signal wire. 24 V DC
power is required for the power supply circuit. Wire the device while referring to the following.
y
General Wiring
DC power
+
−
Fig. 4-1. General wiring
y
Connection and Wiring of External Meter
+
−
+
−
External meter
*2 *3
+
−
DC power
Fig. 4-2. Wiring when external meter is used
* 1 An external load resistance of 250 Ω or more is needed for communication. If the total load resistance
on the receiving gauge side is less than 250 Ω, insert a resistor of the appropriate size into the loop.
* 2 To connect an external meter, first remove the jumper.
* 3 If an meter with an internal resistance of more than 10 Ω will be used, when ordering, select the
specifications for mounting a field meter (high load resistance), additional specification 1: B07.
SUPPLY-
Load resistance* 1
Grounding
Jumper
Meter+
Meter-
Without jumper
Load resistance* 1
Grounding