Watlow QPAC - Manual (Page 12)

12 QPAC User's Guide Chapter 2: Install & Wire
QPAC-01 Output Wiring
for 150 to 1,000A Units.
∫
WARNING: Shock Hazard
Heatsinks are electrically
Live.
ç
CAUTION:
Check terminals for
tightness before ap-
plying power and then
recheck terminals after
one day of operation.
Loose connections can
damage the SCR.
NOTE:
A circuit breaker is re-
quired in addition to the
semiconductor fuses.
All semiconductor fuses
are mounted on board
the QPAC models 400 to
1,000. Where third-leg
fusing is selected, addi-
tional space is required.
NOTE:
QPAC models Q01, Q32
and Q33 up to 300A and
575V
Å (ac) are agency
listed. QPAC models Q01
and Q32 up to 1,000A
and 480V
Å (ac) are
agency listed. Q33 400
to 1,000A are not agency
listed.
∫
WARNING:
To avoid damage to
property and equipment,
and/or injury or loss of
life, use National Electric
Code (NEC) standard
wiring practices to install
and operate the QPAC.
Failure to do so could
result in damage and/or
injury or death.
Output Wiring
*1 NOTE: On 120V Å
(ac) or 277V Å (ac), L2 is
neutral and cannot be
broken.
*2 NOTE: A contactor is
required if a high limit
control is used.
*3 NOTE: A separate
disconnect is required
for the fan(s) if used.
*4 NOTE: Use 14- to 16-
gauge wire for control
power only.
Circuit
Breakers
or
Disconnects
Contactors
If Required
On-board,
factory
installed
semicon-
ductor
fuses
Heater
Load
L1 L2
Fan 120VÅ (ac)/20W
L2
L1
T1
*1
*2
*3
*4
1A Fuse
L1
L2
G
Circuit
Breakers
or
Disconnects
Contactors
If Required
On-board
factory-
installed
semi-
conductor
fuses
Heater
Load
Fan 120VÅ (ac)/20W
L1
L2
L2
L1
L1 T1
L2
L3 T3
L3
1A
fuse
*2
*3
*4
G
QPAC-32 Output Wiring
for 150 to 1,000A Units.