Cutler-Hammer - Eaton Canada
Cutler-Hammer - Eaton Canada
Cutler-Hammer - Eaton Canada
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Checking DC Bus Voltage<br />
TROUBLESHOOTING<br />
Step 1. Set a digital volt meter to read DC volts,<br />
and use the 0 to 1000V scale.<br />
Step 2. Connect the digital volt meter between<br />
the ÒAÓ and ÒBÓ terminals of the capacitor<br />
assembly as shown in Fig. 5-1.<br />
Step 3. Monitor the bus voltage until it reaches<br />
zero volts DC.<br />
AF93/IS903 Instruction Manual<br />
5-6<br />
! Danger High Voltage<br />
Internal parts of the drive are at line voltage<br />
when AC power is connected to input terminals.<br />
This voltage is extremely dangerous and can<br />
cause death or serious injury. When the supply<br />
is disconnected from the input terminal block, it<br />
will take up to 10 minutes before the DC bus<br />
capacitors are discharged to a safe voltage.<br />
To ensure the voltage is safe, monitor the<br />
capacitor discharge with a digital voltmeter<br />
connected between the ÒAÓ and ÒBÓ terminals on<br />
the capacitor assembly as described. Do not<br />
work on the drive until the capacitors have<br />
completely discharged. Do not attempt to<br />
discharge the capacitors by short circuiting the<br />
bus.
Change language