Table of Contents
Advertisement
Chapter 2. Connection to Main Power
The standard voltage input to the 3745 Models 130, 150, or 170 is single-phase,
200 to 240 volts 60 Hz, or 200 to 240 volts 50 Hz.
The power requirement is 1.1 kVA.
Note for the U.S.A., Canada and Japan: If the customer's power supply is 120
volts, you must refer to the IBM 3745 100/120-Volt Connection RPQ 7L1184,
Installation and Maintenance Information, SY33-207B. This book is shipped with
the RPQ package.
Note for other countries: This product allows connection to an impedance
grounded (impedance "terre" or IT) power system. (An IT power system is a
power distribution having no direct connection to earth, the exposed conductive
parts of the electrical installation being grounded.)
Warning: Check that the 3745 ac power rating plate data is consistent with the
voltage and current values available at the customer's receptacle. If not, stop
the installation and notify the sales representative.
Measuring the Customer's Primary Power
CEs are not allowed access to the customer's main power receptacle. The cus-
tomer or
a
customer-appointed electrician may have to do some of the work
involved in the following procedures, ana the CE must ensure that all the steps
have been completed.
Step
1.
Ask the customer to place the 3745 branch circuit breaker to the
ON position. Perform the following voltage measurements. (It is
recommended to use high voltage probes- to make these measure-
ments. All voltage values should be less than 1.0 Vac.)
a. __ Measure the voltage between the ground pin of the custom-
er's receptacle and the building ground.
b. __ If applicable, measure the vOltage between the exterior shell
of the customer's receptacle and the building ground.
c. __ (World Trade only) Measure the voltage between the neutral
of the customer's receptacle (if present) and the building ground.
If the voltage is greater than 1.0 Vac, notify the customer and do not
proceed until the problem is corrected.
Step
2. __ Measure the customer's phase-to-neutral or phase-to-phase
voltage. Continue only if the measured value is in accordance with
the following table:
Nominal Voltage
Acceptable Voltage Limits
200 or 208 Volts
180 through 220 Volts
220 Volts
193 through 240 Volts
240 Volts
210 through 260 Volts
Step
3. __ Place or ask the customer to place the branch circuit breaker
that feeds the 3745 to the
OFF
position.
Step
4. __ On the front side of the primary power box, set the voltage
selection switch SW1 (see Figure 2-1 on page 2-2) according to the
following table:
©
Copynght I BM Corp. 1989, 1991
Note: This adjustment reduces to a minimum, alarms due to external
voltage variations, and regulates the blower rotation speed (noise
reduction).
2-1
Advertisement
Table of Contents
