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MAINTENANCE BYPASS
BEFORE ACTIVATING ANY KIND OF EXTERNAL BYPASS SWITCH, UPS MUST BE SET IN INTERNAL STATIC BYPASS
MODE. IF NOT INVERTER OUTPUT OF THE UPS WILL BE SHORTED WITH AC MAIN INPUT. THAT SITUATION COULD
PRODUCE PERMANENT DAMAGE IN THE UPS.
From time to time, all UPS require maintenance that can only be performed if UPS is powered-off. In that case, UPS must be set in
bypass to keep system running by feeding it from the AC input service even UPS is powered-off.
•
OPTIMA-T10 tower models have their own Maintenance Bypass Switch (MBS) located on rear panel.
•
OPTIMA RT models require an external MBS switch. XMART can provide an optional MBS accessory named MBS-10K-TB
MBS from XMART has a safety plate. As soon as this plate is removed, MBS sends a signal to the UPS, so UPS adopts static bypass
mode to prepare UPS for the imminent external MBS activation. In tower Optima T10 models, this signal is wired internally. For RT models,
the XMART MBS-10K-TB external accessory also has this safety plate. Its related status signal cable must be connected from MBS to
UPS.
IMPORTANT NOTES:
- Other XMART UPS models like RT9W do not have input status port for safety plate detection signal so operator MUST change UPS to
static bypass mode before actuating external MBS.
- Meanwhile UPS in under maintenance bypass mode, load is powered by AC input service so any problem in main service will affect
directly to the load.
PROCEDURE FOR ACTIVATING EXTERNAL BYPASS
1)
Confirm bypass mode is allowed in UPS configuration. Check input voltage is in the acceptable input range for bypass mode.
2)
Set UPS in static bypass mode by pressing OFF button in front panel. Ups will adopt bypass mode only in bypass is allowed by
configuration and input is inside bypass range. Check bypass LED in front panel is ON and online LED is OFF.
3)
Activate External BYPASS switch to bypass position to connect AC input directly to the load.
4)
Once the load is powered by AC main input service, UPS can be powered off for maintenance. If there are external batteries,
proceed to open DC switches on XBAT to disconnect batteries from the UPS.
COMING BACK FROM MAINTENANCE BYPASS MODE TO NORMAL MODE
1)
Power AC input lines and switch-ON input breaker located on rear panel of UPS. If UPS has external batteries, connect them to
the UPS switching-on DC switches on XBAT rear panels.
2)
Verify UPS enters in static bypass mode. Bypass LED must be ON and online LED must be OFF
3)
Actuate external bypass switch to UPS and re-install its safety plate.
4)
Turn UPS on by pressing ON button on front panel. Keep ON button pressed during 2s or longer.
GENERIC EXTERNAL BYPASS SWITCH: In case user decides to install a generic external bypass switch, this bypass should be designed
and connected to assure that UPS output never will be connected to AC input. This kind of Bypass switches usually has 2 inputs - 1 output
and they are connected as indicated in below image:
www.xmart-ups.com
USER MANUAL – OPTIMA-T10 6K/10K (UL)
VER.190731-GA2UL (ENG)
INDEX
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