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Chapter 12 Helpful information
How to avoid high inrush currents, example - SMPS
Besides high leakage currents Switched-mode Power Supplies can also cause high inrush
currents. One method how to overcome this issue is described in the section
Problems" in step 2 of this chapter.
The following UPS units can be switched from IT-mode (Network mode) to Industrial-mode in
order to reduce the impact of high inrush currents:
Lenovo RT5kVA 3U Rack or Tower UPS (200-240VAC), 5594-5KX
•
Lenovo RT6kVA 3U Rack or Tower UPS (200-240VAC), 5594-6KX
•
Lenovo RT8kVA 6U Rack or Tower UPS (200-240VAC), 55948KX
•
Lenovo RT11kVA 6U Rack or Tower UPS (200-240VAC), 5594-9KX
•
IBM RT5kVA 3U Rack or Tower UPS (200-240VAC), 5594-5KX
•
IBM RT6kVA 3U Rack or Tower UPS (200-240VAC), 5594-6KX
•
IBM RT8kVA 6U Rack or Tower UPS (200-240VAC), 55948KX
•
IBM RT11kVA 6U Rack or Tower UPS (200-240VAC), 5594-9KX
•
What to do if circuit breaker still trips when changing UPS operation mode
The UPS units mentioned in the at this chapter have a
start the UPS in bypass mode, switch it to UPS conditioning. This will help overcome the
startup of the SMPS causing a trip.
Steps on the LCD menu
From the Main Menu scroll to
Scroll to
Go to Bypass
Once in bypass the menu entry will change to
Types of MCB based on Number of Poles
Another practical way of distinguishing MCBs is by way of the number of poles supported by
the circuit breaker. Based on that, following types exist:
1. Single Pole (SP) MCB: A single pole MCB provides switching and protection only for
one single phase of a circuit.
2. Double Pole (DP) MCB: A two Pole MCB provides switching and protection both for a
phase and the neutral.
3. Triple Pole (TP) MCB: A triple/three phase MCB provides switching and protection only
to three phases of the circuit and not to the neutral.
4. 3 Pole with Neutral [TPN (3P+N) MCB]: A TPN MCB, has switching and protection to
all three phases of circuit and additionally Neutral is also part of the MCB as a separate
pole. However, Neutral pole is without any protection and can only be switched.
198
and press ↲ ( Enter)
Control
and press ↲ ( Enter)
Start On Bypass
Normal, select it and press ↲ ( Enter)
Go back to
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
"Most Common
function, that is in case
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