MEP-7xxx Direct-Coupled Actuators (up to 320 in-lb.)
9
Applications Guide, AN1113A Rev. D
Troubleshooting
Auxiliary Switch Does Not Work
•
Check the auxiliary switch setting. See the
CME-7001/7002 Auxiliary Switches Installation
.
.
Fail-Safe Does Not Work
• After initial connection or reconnection to power,
proper fail-safe operation might be delayed up
to 20 seconds for the MEP-725x/755x or up to 40
seconds for the MEP-785x (until the capacitors
are fully charged).
• Check the Fail-Safe Direction switch. See
Feedback Does Not Work
• Check the feedback
.
.
No Rotation
• Check that the direction switch (Switch 2) is fully
engaged in the proper position. See
• Check that the shaft moves freely. (Press and
hold the gear disengagement lever and manually
rotate the shaft.)
• Check for a tripped circuit breaker to the trans-
former (or power supply).
• Check polarity and strength of input signal.
• Check for proper supply voltage from the trans-
former (or power supply) and that it has enough
capacity (VA) for all connected devices. See their
respective data sheets and
24-Volt Power Application Note (AN0604D)
.
For direction, feedback, and auto-mapping setup,
see the
MEP-7200/7500/7800 Series Installation
NOTE:
Before Jan. 2014,
MEP-7xx2 proportional
models had (besides the 4-20 mA input)
a
0–10 VDC input
and
0–5 or 0–10 VDC
feedback
. From 2014 through July 2015,
they had a
2–10
VDC input and
1–5 or 2–10
VDC feedback instead. Starting in August
2015,
all
these options were available and
selectable via a jumper and slide switch.
NOTE:
When the
0
–10 VDC input is selected (with
the jumper), selectable (with a switch)
feedback options are
0
–5 or
0
–10 VDC.
When the
2
–10 VDC input is selected,
feedback options are
1
–5 or
2
–10 VDC.
Configuration
