Rockwell Automation SB3000 AC Power Modules - Manual (Page 48)

4-10 SB3000 Power Modules (Rittal)
4.3.2.11 PMI Fan Loss Warning
The PMI Fan Loss Warning bit (bit 12) is set in the Warning register (203/1203) if there
is no airflow through the PMI rack.
4.3.2.12 Rail Communication Warning
The Rail Communication Warning bit (bit 13) is set in the Warning register (203/1203)
if a rail communication problem occurs and is logged in registers 4, 10, 16, or 22.
4.3.2.13 CCLK Not Synchronized Warning
The CCLK Not Synchronized Warning bit (bit 14) is set in the Warning register
(203/1203) if the CCLK counters in the PMI Processor and UDC module are
momentarily unsynchronized.
4.3.2.14 PMI Communication Warning
The PMI Communication Warning bit (bit 15) is set in the Warning register (203/1203)
if a fiber-optic communication error occurs between the PMI Processor and the UDC
module. Communication errors in two consecutive messages will result in a fault.
4.4 Replacing the Power Module Cabinet
Use the following procedure to replace an SB3000 Power Module cabinet:
Step 1. Turn off and lock out the AC input power at the input reactor/pre-charge
control cabinet.
Step 2. Wait ten minutes to allow the DC bus voltage to dissipate.
Step 3. Look at the built-in DC Bus Voltage meter. When the DC bus potential is
down to approximately zero volts, open the SB3000 Power Module cabinet's
doors and measure the DC bus potential across the DC bus bars, 1247
A,B,C (+ bus) and 1145 A,B,C (- bus), with an external voltmeter before
working on the unit. See figure 4.1.
Step 4. Disconnect the AC input leads from terminals 181 (L1), 182 (L2), and 183
(L3). Disconnect the GND wire from the ground terminal. See figure 3.4.
Step 5. Disconnect the AC input line (two-wire 110 VAC) from the L and N terminals.
See figure 3.4.
Step 6. Disconnect the DC bus from terminals 45 and 47. See figure 3.4.
Step 7. Remove the SB3000 Power Module cabinet.
!
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait ten
(10) minutes for the DC bus capacitors to discharge, then look at the
built-in DC bus voltage meter. When the voltage is down to approximately
zero (0) volts, open the cabinet doors and check the voltage across the
DC bus bars, 1247 A,B,C (+ bus) and 1145 A,B,C (- bus), with an external
voltmeter to ensure the DC bus capacitors are discharged before
touching any internal components. Failure to observe this precaution
could result in severe bodily injury or loss of life.