GFK-0356Q
Chapter 2 Installation
2-23
2
AC Power Source Connections
AC Input Wiring to AC/DC Power Supplies
Warning
If the same AC power source is used to provide AC power to other baseplates
in a Series 90-30 PLC System, ensure that all AC input connections are
identical at each rack. Do not cross Line 1 (L1) and Line 2 (L2). A resulting
difference in potential can injure personnel or cause damage to equipment.
Each baseplate must be connected to a common ground.
Ensure that the protective cover is installed over all terminal boards.
During normal operation with an AC power source either 120 VAC or 240
VAC is present on the AC Power Supply. The cover protects against
accidental shock hazard which could cause severe or fatal injury to the
operator or maintenance personnel.
Both the Standard (IC693PWR321) and High Capacity (IC693PWR330) AC/DC power supplies
currently have six terminals for user connections. Early versions of some Series 90-30 power
supplies had five terminals (see next figure). The wiring methods for both five-terminal and six-
terminal types is similar, except that step 3 below does not apply to the five-terminal type.
The power supply terminal boards will accept one AWG #14 (2.1 mm
2
) or two AWG #16 (1.3
mm
2
) copper 75
_
C (167
_
F) wires. Each terminal can accept solid or stranded wires, but the wires
in any given terminal should be the same type. The suggested torque for the power supply terminal
board is 12 in-lbs (1.36 Newton-meters). Open the door protecting the terminal board and make
the following connections from the AC power source, and ground connections (system grounding
requirements are described in detail later in this chapter).
1.
These are wide range supplies that can operate from an AC power source within the nominal
range of 100 VAC to 240 VAC at 50/60 Hz. This may vary -15% to +10% for a total
maximum range of 85 VAC to 264 VAC. These are auto-ranging supplies that do not require
jumper or switch settings for selection of power source voltage.
2.
Connect the hot and neutral wires or lines L1 and L2 to the upper two terminals on the
terminal board. Connect the safety ground wire to the ground terminal, which is the third
terminal from the top, and is marked with a ground symbol.
3.
For power supplies with six terminals, the factory jumper between the 3rd and 4th terminals
(see figure below), should be left in place for normal installations. However, this jumper must
be removed and external surge suppressors installed in installations with a “Floating Neutral”
input. Please see the section “Special Instructions for Floating Neutral (IT) Systems” later in
this chapter for details.
4.
After all connections to Power Supply terminal board have been completed, the protective
cover plate should be carefully reinstalled.
