26
15272 Newsboy Circle
Huntington Beach,
CA 92649
Phone: 714-751-0488
Fax: 714-372-7930
E-Mail: techservice@newmarpower.com
PoweringTheNetwork.com
7. TROUBLE SHOOTING
7.1 For MBS Module
Problem
Possible Cause
Remedy
No output available from
MBS.
External AC circuit breaker may be OPEN.
Close the external AC input breaker.
Line AC power is not available.
Check if utility is available with the AC
voltmeter and contact Utility Company.
Wiring error on MBS terminal blocks.
Correct wirings on MBS.
MBS fault.
If utility power voltage is present at AC IN “L”
and “N” on the MBS terminal blocks, replace
the MBS.
MBS is not allowed to
transfer to battery mode.
UPS output power is not connected to MBS.
Verify if power cord from “UPS OUT” on MBS
is properly connected to the AC output
terminal blocks on UPS.
“UPS INPUT” circuit breaker on MBS is open
status.
Reset breaker.
Black and red control wires from MBS are
not connected to MBS control connector of
UPS.
Connect black and red control wires from
MBS to MBS control connector of UPS.
48V DC signal not available at the MBS
control connector on the UPS.
Replace UPS.
MBS fault.
Replace MBS
UPS does not return back
to Line mode.
Line power is missing.
Verify if power cord from “UPS IN” on MBS is
properly connected to the AC input terminal
blocks on UPS.
Verify if the “UPS INPUT” circuit breaker on
MBS is closed status.
Verify if AC input circuit breaker on UPS is
closed status.
Ensure that Line input is present.
No output.
AC input and output circuit breakers are off. Turn on input and output circuit breakers.
No line power input.
Turn on AC input breaker.
Red LED is lit solid on front panel indicating
fault.
Read fault event under Event Log in LCD
display. Manually restart UPS. Contact the
factory if fault persists.
Output LED is off.
Line power or battery power is not available. Apply qualified input power and make sure
if battery breaker is closed.
UPS fault.
Return to repair center.
UPS does not transfer to
battery mode during a
power failure or backup
time is shorter than
expected.
Battery is not connected.
Connect batteries (48V DC/24 V DC
nominal).
Battery circuit breaker is off.
Turn on battery breaker
Battery is not fully charged.
Recharge the battery and then test
discharge time.
Dead battery.
Replace with new batteries.
UPS fault.
Return to repair center.
Alarm LED is lit.
Abnormal conditions are detected.
Solve the problem according to alarm
information in Figure 21.
7.2 For UPS Module