Ablerex 3 MS series - Chapter 4: Trouble Shooting Guide For MSIK; 4.1. Utility Normal, UPS on Battery

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Chapter Four: Trouble Shooting Guide For MS1K
4.1. Utility is Normal, but UPS on Battery Mode
FIG. 4.1
Check Items Trouble-shooting
Utility Voltage is out of windows(<80Vac or
>140Vac for 120Vac system;160Vac or >280Vac
for 230Vac system)
Your Utility quality is too bad. You are
recommended to install an AVR in front of the
UPS.
Input AC fuse is broken. Replace a new fuse with same rating one.
Input Power Cord is loose in connection. Please re-connect the loose Input Power Cord
properly back to its position.
Input detecting circuit is out of
order.
Please check
whether the U1(LM324) or
D1(1N4148) Of MS-D9917-x are defective.
Over-voltage Trip-off circuit is out of order.
1.Refer to fig4.1. Please check those items of
MS-D9917-x Boards are defective:
2. The transformer T3 is open.
3. C69 is 11-13V?
4. D34, and Relay K1