Chapter 3. Site Preparation
24
Installation Planning Guide
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3.2 Uninterrupted Power Supply (UPS)
If your site experiences frequent and short (less than 10 minutes) power outages, you may
want to consider a UPS. UPS systems are limited in how long they can supply power when
house power is out. Consider the placement of a UPS when planning your lab. If you want
to use one UPS, it must have output for 120 Vac and it must be installed such that both the
NMR console and the host computer can use it. Sites in Europe might want a UPS that
includes a 220 Vac output for test equipment.
To determine the power rating for the UPS (in kW), refer to
the values (kW) for the accessories with your system.
3.3 Electrical Outlets
lists the electrical outlet requirements of system components. The sections below
details the requirements of each component.
Host Computer and Peripherals.
The host workstation and accessories require a
minimum of six 120 Vac (or 220 Vac—they are autoswitching), single-phase power outlets.
Locations with ac voltages over 132 Vac should check with their local Varian service center
for power outlet requirements. Locations with ac voltages over 125 Vac might need at least
one step-down transformer. To minimize ground loop interference, these outlets should all
be on the same 20 A service. It is strongly recommended that surge protection be provided.
MERCURY-VX NMR Console
requires a dedicated single-phase, continuous-duty 117
±
15 Vac, 50/60 Hz power line. The basic system draws less than 1 kW for 117 Vac, so a 15
A circuit is adequate. Terminate the line within 2.7 m (9 ft) of the rear of the electronics
cabinet with a duplex receptacle connected to a fused, quick-disconnect switch box or
circuit breaker. Run a separate, insulated, low-resistance earth ground to the main electrical
service entrance ground. The console’s input power cable is terminated with a NEMA 5-
15P plug.
Accessories and Test Equipment
requires at least six ac outlets within 2 m (6 ft) of the
host computer, electronics cabinet, and magnet. The outlets must have ground connections
and should provide a minimum of 2.30 kVA at the local single-phase line voltage (115 Vac
at 20 A, or 230 Vac at 10 A).
SMS Autosampler System
requires two 120 or 220 Vac, single-phase, continuous-duty
50/60 Hz power line, 15 A minimum service, within 2.7 m (9 ft) of the magnet.
Table 11. Electrical Outlet Requirements
Equipment
Number of
Outlets
Electrical Requirements
Host computer and peripherals
6
120/220 Vac
MERCURY-VX NMR console
1
120 Vac, 15A
SMS autosampler
2
120 or 220 Vac, 15A
Accessories and test equipment
6
120 Vac, 20A or
230 Vac, 10A