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Chapter 5 Installing the Tracer MP581 programmable controller
72 BAS-APG001-EN
1. Make sure that the actuator is connected but powered off.
2. Set the multi-meter to measure Vac, then measure the voltage across
the analog output at the signal and common screw terminals.
The measured voltage should be less than 0.1 Vac. If the voltage is
greater than this, the load may turn on and off unexpectedly. Check
for the following problems:
• A shared power supply may be incorrectly connected. Check along
the wire to make sure that no additional connections have been
made.
• The wire may have an induced voltage somewhere along its
length.
3. Set the multi-meter to measure Vdc, then measure the voltage across
the analog output at the signal and common screw terminals.
The measured voltage should be less than 0.1 Vdc. If the voltage is
greater than this, a shared power supply may be incorrectly con
-
nected. Check along the wire to make sure that no additional connec-
tions have been made.
CAUTION
Equipment damage!
Continue to step 4 only if you completed steps 2 and 3 successfully.
Measuring resistance may damage the meter if the voltage is too high.
4. Set the multi-meter to measure resistance. If you completed steps 2
and 3 successfully, measure the resistance across the analog output at
the signal and common screw terminals.
The resistance should be greater than 500 Ω. (The analog output will
not be able to reach 10 Vdc if the load resistance is less than 500 Ω
.)
Checking 0–20 mA analog outputs
To check 0–20 mA analog outputs for proper operation:
1. Make sure that the actuator is connected but powered off.
2. Set the multi-meter to measure Vac, then measure the voltage across
the analog output at the signal and common screw terminals.
The measured voltage should be less than 0.1 Vac. If the voltage is
greater than this, the load may turn on and off unexpectedly. Check
for the following problems:
• A shared power supply may be incorrectly connected. Check along
the wire to make sure that no additional connections have been
made.
• The wire may have an induced voltage somewhere along its
length.