MYERS MP Series, Installation, Operation & Maintenance Manual

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2.4.3 Troubleshooting
The normal operation of the MP2000E is to allow a qualified utility line to pass through the
BBS system to the output load. If the line drops out of tolerance then the MP2000E will
assume the load until the utility line is re-qualified or the batteries are depleted.
Oscilloscope traces are included at the end of this section illustrating what typical in
tolerance waveforms should look like. Following are some general troubleshooting
guideline to isolate a problem within the BBS system.
1. MBPS (Manual Bypass Switch)
The Manual ByPass Switch is used when the MP2000E requires servicing. During
normal operation the MBPS is set to UPS mode. This will allow the utility input line to
pass through the MBPS to the PTS input as well as allowing the PTS output to pass
through to the load.
a) To check the MBPS when it is set to UPS mode:
•
Verify that the position of the MBPS is in UPS mode (See Figure 9).
•
Measure the voltage on position 2 of the MBPS with respect to neutral. Note: All
neutral wires in the system are common, so the neutral wire can be found on the
input terminal block of the PTS, on the input block in the cabinet, or on the
MP2000E input terminal block.
•
If the utility voltage is not present then check the wiring from the utility entrance
to the MBPS.
•
If the utility voltage is present measure the voltage on position 1B of the MBPS
with respect to neutral. If the voltage is not present then the MBPS switch is
defective.
•
If the utility voltage is present measure the voltage from the line out terminal block
on the PTS. If the voltage is not present there is a problem with the PTS or
MP2000E. See troubleshooting the PTS or MP2000E.
•
If the utility voltage is present measure the voltage on terminal 1 of the MBPS with
respect to neutral. If the utility voltage is not present the MBPS switch is
defective.
•
If the utility voltage is present on terminal 1 with respect to neutral but not present
at the load then check the wiring between the MBPS and the load.
b) To check the MBPS when it is set to Bypass mode:
•
Ensure the MBPS in UPS mode first by following steps above.
•
Verify that the position of the MBPS is in UPS mode.
•
Measure the voltage on position 2B of the MBPS with respect to neutral. Note:
All neutral wires in the system are common, so the neutral wire can be found on
the input terminal block of the PTS, on the input block in the cabinet, or on the
MP2000E input terminal block.
•
If the utility voltage is present measure the voltage on position 2A of the MBPS
with respect to neutral. If the voltage is not present then replace the jumper wire
between position 2B and position 2A.
•
If the utility voltage is present measure the voltage on position 1 of the MBPS with
respect to neutral. If the utility voltage is not present the MBPS switch is
defective.