Watlow MLS-PM, User Manual

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30 MLS User’s Guide
Installation
Testing Your System
This section explains how to test the controller after installation.
MLS-AIM Test
Use this procedure to test the MLS-AIM before you connect inputs to it.
1. Connect a wire from the A+ terminal for loop 1 to the A- terminal for
loop 1.
2. Turn on power to the MLS-PM.
3. Press the ALARM ACK key to clear the alarm messages displayed
on the MLS-PM's screen.
4. Press the YES key to reach the single loop display for Loop 1. The
MLS-AIM-TB contains an ambient temperature sensor, so Loop 1
should display room temperature. If it does not, contact Watlow-
Anafaze.
RTB Test
1. Turn on power to the MLS.
2. Measure the +5Vdc supply at the RTB:
A. Connect the voltmeter's Common lead to RTB terminal #3.
B. Connect the voltmeter's Power lead to RTB screw terminal #1.
The voltage should be 4.75 to 5.25 Vdc.
C. Connect the Power lead to RTB screw terminal #2. The voltage
should be 4.75 to 5.25 Vdc.
D. Connect the Power lead to RTB screw terminal #4. The voltage
should read 0 volts.
PID Output Test
1. Connect the voltmeter power lead to RTB screw terminal #1.
2. Connect the Common lead to the PID output pin.
3. If you have not connected a load to the output, connect a 500 ohm to
100 Kohm resistor between RTB screw terminal 1 and the PID output
pin.
4. Use the digital output test (in the Manual I/O Test menus) to turn the
digital output on and off. When the output is off, the output voltage
should be less than 1V. When the output is on, the output voltage
should be between 3.75 and 5.5V.