Eclipse UDC2500 Limit, Manual, Page: 35 / 128

Installation
8/05 UDC2500 Universal Digital Limit ControllerProduct Manual 25
2 Wire Transmitter
_
+
INPUT 1 AUXILIARY OUTPUT
250
Ω
xxxx
26 +
27 -
12 +
13 -
Configure:
AUXOUT = OUT
Auxiliary Output Calibration
ZEROVAL = 4095
SPANVAL = 4095
If necessary, install a zener diode here to reduce voltage at the
transmitter. A 1N4733 will reduce the voltage at the transmitter to
approximately 25 Vdc. 1
1
Figure 2-14 Transmitter Power for 4-20 mA — 2 Wire Transmitter
Using Auxiliary Output
2.8 Limit Control Application Diagram
Limit Controller Wiring
Figure 2-15 shows the RIGHT and WRONG way to wire your Limit Controller.
PROCESS
CONTROLLER
LIMIT
CONTROLLER
PROCESS
CONTROLLER
LIMIT
CONTROLLER
CONTROL
RELAY/
SOLENOID
POWER
1 2
The Limit Controller CANNOT protect
against a failure of the Control relay
LOAD
POWER
1
2
CONTROL
RELAY/
SOLENOID
LOAD
POWER
POWER
The Limit Controller
CAN
protect
against a failure of the Control relay
WRONG RIGHT
Figure 2-15 Limit Controller Application Diagram