Starting Out
6
QPAC User's Manual
Install and Wire, Chapter 2
Current Semi- Minimum Bending Radius Lugs QPAC Fuse
(Amps) conduc- Recom- Accept Model Mounting
tor Fuse mended inches (mm) # Wire Number
Rating Wire Size
(Amps)
30 2ea, 20 10 N/A 18 to 4 Q01 Onboard
2ea, 40 Q32 External
3ea, 40 Q33 External
50 2ea, 30 8 1.5 (38) 18 to 4 Q01 Onboard
2ea, 70 Q32 External
3ea, 70 Q33 External
75 100 4 2 (51) 8 to 0 All External
100 125 1 3 (76) 8 to 0 All External
150 200 3/0 4 (102) 4 to 3/0 All Onboard
200 250 250 MCM 4.5 (114) 6 to 350 MCM All Onboard
300 400 500 MCM 8 (203) 4 to 500 MCM All Onboard
Installation
Chapter 2
How to Install and Wire the QPAC
System Planning
This chapter tells you how to install the QPAC. All mounting and wiring infor-
mation is right here. Watlow power controls are thoroughly tested before
leaving the factory, so the QPAC is ready to install when you receive it.
This chapter is divided into three sections which describe the three steps you
need to do to install the QPAC—mounting, power wiring and control card
wiring. The first section lists the mounting information for each of the three
types of QPACs, which, depending on amperage, use one of five case styles.
The second section describes the power and load wiring of the QPACs and
semiconductor fuses, if required. The last section describes the input signal
wiring to the QPAC Control Card.
Before you begin working, read through this chapter to gain an understanding
of the entire installation. Consider the installation carefully. Plan the power,
load, and input signal wiring before mounting the QPAC. Also refer to any
noise guidelines in the temperature control documentation before proceeding.
Mounting the QPAC ∫
The physical size and mounting dimensions of the QPACs are different for
different current ratings. Find the "Case Style" photo on the next pages which
match your QPAC. The table and figure accompanying each case style will
give you corresponding physical dimensions and mounting footprint. The table
also indicates if the units are equipped with fans and externally-mounted fuses.
External fuse mounting templates also accompany the case style drawings. All
QPACs must be mounted vertically, power connections on top, for proper
cooling. Use the wiring data table below for wire sizes and bending radii.
Table 1 -
QPAC Wiring Data
Mounting
∑
WARNING:
To avoid potential
electric shock and
other hazards, all
mounting and wiring
for the QPAC must
conform to the Na-
tional Electric Code
(NEC) and other lo-
cally applicable
codes.
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