Location; Common Installation Procedure; Grounding; Input And Output Cable Connections - MGE UPS Systems 3.5 to 21 kVA N+1 Owner's Manual

2.2.1

Location

The equipment is designed for installation in a protected environment. Factors to be considered in selecting a
location include ventilation, temperature, humidity, and accessibility. Install the unit in a clean, dry location with an
unrestricted air flow. The equipment is cooled by forced air. Allow at least 6 inches of air space around the
equipment for proper cooling.
2.3

Common Installation Procedure

Note: The installation procedure is common with all units.
2.3.0

Grounding

For safety and proper operation of the unit, including maximum attenuation of electrical noise, suitable grounding is
required. A separate grounding electrode conductor should be connected from the ground (GND) terminal to a
nearby grounding electrode, and should be sized per National Electrical Code Article 250-94. The grounding
electrode should be grounded structural metal, a metal water pipe, or a suitable ground rod (National Electrical Code
250-26). The grounding electrode should be as near as possible to the unit. The S4 will accommodate two 1/0
gauge wire. Customer provides grounding system.
Move the "receiver" cabinet to its intended location, using one of the suggested handling methods. After it is in its
final position, remove the blank panels from the front of the "receiver" cabinet. Blank panels are supplied with the
unit so as to prevent damage to the unit during shipment. Remove these blank panels, but do not discard them.
Remove top cover panel on the receiver's "static switch" (cover of the panel with two fans) for access to the wiring
area. The connections to be made are the DC input connections, load connections, AC input connections, and
optional remote alarm connections. The connection terminals and buss bars are located at the static switch area,
which is in the center of the receiver cabinet. For safety, the DC safety ground connection should me connected
first, then DC positive (+) connection made next, then the DC negative (-) last.
2.3.1

Input and Output Cable Connections

2.3.1.1 AC Input Circuit Breaker

If utility line voltage is connected to the system, an appropriately rated AC
circuit breaker MUST be installed between the supplying AC source and the
inverter plant.
installation requirements.
Suggested circuit breaker ratings:
Inverter rating
AC breaker rating

2.3.1.2 DC Input Circuit Breaker

Due to tremendous amounts of short circuit current available (in excess of 1000Amps for as long as several
minutes!) from bank(s) of batteries, that supply electrical power to inverter systems, it is extremely important to
connect a properly sized DC circuit breaker at the DC input cable that feeds the inverter system. The following table
is provided as a guide for selecting the proper circuit breaker.
WARNING
Installation must comply with local/national electrical
3.5 kVA 7 kVA
30A 60A
Installation & Operation
10.5 kVA 14 kVA
100A 125A
Owner's Manual
17.5 kVA 21 kVA
150A 200A
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