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www.tescom-ups.gr
USER MANUAL
DS 300H Series � 3/3 � 30 kVA � UPS CONTROLLED UPS
VIII. FAULTS AND TROUBLESHOOTING
8.1 General Procedure For Fault Checking And Troubleshooting
UPS contains complicated electronic control circuits. In order to locate any fault occurring circuits, an
advanced knowledge about the circuitry and its operation principles must be known. The aim of this section
is to give the knowledge required at the first intervention.
There is no practical way to locate any possible fault. Most of the faults do not occur as a performance
decrement. Generally, the UPS operates normally or switches into by-pass mode. But in order to determine
any change in load or the system the parameters must be recorded regularly as mentioned previously.
Generally, the output voltage can deviate %2 from the predefined values. If values differ more than this
percentage then reasons must be investigated.
The following general structure must be systematically followed while trying to indicate the error:
Fault determination: First step is to record the messages, indicator panel LEDs, operating parameter
values and last status of switches. This must be done before
Fixing interventions: After recording all indications, check the meaning of the fault and alarm
messages using “The operator control indicator panel”. If anything related, follow the related procedure.
Reporting the fault: Service personal must clearly report the work done. Hence, if any other error
occurs there will be enough information to fix it.
8.2 Before Calling Service
Please check and note the following:
1- Did you read the user manual carefully and applied the procedures accordingly?
2- Are the switches and circuit breakers of UPS in their normal position?
3- Is there electric power at the UPS line connection distribution panel?
4- Did you turn the battery switch on (to “1“ position) when UPS started to operate in normal mode?
5- Which of the warning lights on front panel is (are) on?
6- Is there any change in the load level at the output of UPS?
7- Did any overload condition happen or not?
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IX. UPS REMOTE MONITORING AND CONTROL
Following external connections are available for DS300H Series UPSs.
• Communication by serial port connection.
• Dry contact (interface board) connections.
• Remote monitoring panel.
Using one of above communication options is satisfactory for remote monitoring and control in most of the
systems. But in some systems may use 2 or 3 of above options at the same time. In this case accessories
group produced by Tescom may help to make appropriate solutions.
9.1 Using Serial Port
Two serial communication port is included on DS300H Series UPS cabinet (com1 and com2). Both of them
may be used for user communication. But in service status duty of com2 port is changed and set as service
port in Options Menu.
All data of UPS can be accessed by this communication way. All the voltage and current values measured
by UPS, alarms, warning and status messages can be monitored.
Because the communication system is designed in an interactive manner, UPS may get commands from
monitoring and control units. These commands are listed below:
• Switch to BYPASS
• Switch to INVERTER
• SOUND on/off
• Adjust UPS time and date
• Quick BATTERY TEST
• BATTERY TEST until battery low alarm
• CANCEL battery test
• Turn off UPS output voltage immediately (SHUTDOWN)
• Turn off UPS output voltage after delay (WAITING SHUTDOWN)
• Turn off UPS output voltage (SHUTDOWN) and turn on UPS output voltage (WAITING RESTART)
• CANCEL SHUTDOWN
• RENAME UPS
These commands are evaluated only if REMOTE CNTRL: ON option is selected in
OPTİONS/COMMUNICATION OPTIONS menu and if user password is sent from this (com2) port.
Otherwise UPS doesnʼt perform these commands and only information can be obtained from the ports.
Special softwares are required in order to use the serial communication ports. Some of the commands
above have special functions and they can only be activated and used by operating TMON program groups
on a PC that is serially connected to UPS.
TMON program group includes softwares developed by TESCOM.
Additionally, remote monitoring and control is provided in every kind of operating systems, by using
worldwide known and continuously devoloping software programs. These softwares can be supplied from
TESCOM.
9.2 Serial Communication Port Connection Cable
The maximum length for RS232 communication cable should be 25 meters. For remote panel and UPS
connection the same pin configuration is valid. Connection terminals of RS232 cable is shown below for
com1 and com2 ports:
UPS Side Panel Side
9 Tx 2 Rx
7 Gnd 5 Gnd
6 Rx 3 Tx
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