Siemens 3PCI Series, Operation Manual

Page: 13 / 54

3PCI SCR Power Controller Series Manual Installation
Version 1.2 (19000325)
s
2-1
CHAPTER 2: INSTALLATION
In This Section:
•
Mounting the 3PCI .......................................................2-1
•
Fan Wiring (Models Rated at 90 A and Higher)...........2-1
•
Wiring Overtemperature Contacts ...............................2-1
•
Input/Output Wiring ......................................................2-1
•
Adjusting the Overcurrent (OC) Feature......................2-1
•
Internal 3PCI Connections ...........................................2-4
2.1. Mounting the 3PCI
Determine the voltage and current ratings from the nameplate of the unit (refer to Table 1-2 on page 2-5).
Then determine space and mounting hole requirements by referring to the appropriate outline drawing
(located at the end of this manual) that applies to your model’s current rating. Mount the unit so that the line
and load connections are at the top and ensure that upward air flow over the heat sink fins is unrestricted. On
high current models, allow adequate clearance for routing the relatively large diameter input and output lines.
Caution! Printed circuit boards contain sensitive components that can be damaged by electrostatic
discharge (ESD). The 3PCI power controllers are shipped from the factory wrapped in static-free
packing materials. Avoid handling the printed circuit board unless ESD protection has been observed.
Details concerning ESD protection can be found in Section 5.3: Static Precautions When Servicing on
page 5-1 in the Troubleshooting section of this manual.
2.2. Fan Wiring (Models Rated at 90 A and Higher)
3PCI models with cooling fans require 120 Vac power which must be supplied by the customer. Power
requirements are shown in Table 1-1 on page 1-3.
The 3PCI terminals available for the 120 Vac fan connections are shown in the drawings at the rear of this
manual. Locate the correct drawing for your model’s current rating.
Caution! The application of fan power should precede, or coincide with, the turn-on of the line voltage
source that is to be controlled by the 3PCI. How this is accomplished and ensured is up to the
customer.
2.3. Wiring Overtemperature Contacts
Normally-open (N.O.) heat sink thermostats are standard on all fan-cooled models (rated 90 A and higher).
These thermostats, which close on high heat sink temperature (200° F), may be used to initiate an alarm,
shunt trip, or other device for SCR protection.
If desired, normally-closed (N.C.) contacts may be ordered rather than normally-open (standard). Heat sink
thermostats are optional on units with current ratings lower than 90 A, and can be ordered with either N.O. or
N.C. contacts.
2.4. Input/Output Wiring
Using appropriately sized and insulated conductors for the voltage and current ratings of your model, make
connections as shown in Figure 2-1 and Figure 2-2. (Refer to Table 2-1 on page 2-2 for wire size
information.) Torque specifications of bolted connections can be found in Table 5-3 and Table 5-4 starting on
page 5-5.