Watlow QPAC Modular SCR Power Control Service - Manual (Page 7)

WATLOW QPAC Service Manual
7 Overview, Chapter 1
Specifications
Output
• 120VAC through 480VAC (600VAC, consult factory)
• 1, 2, or 3 pole
• 30 through 300 amps per pole
Power
• Frequency 50/60 Hz
• Voltage +/- 10%, 120/208/240/277/380/415/480VAC (600VAC, consult factory)
Power Dissipation (Watts)
• 1.5 watts/amps per controlled leg
Line Voltage Compensation
• 10%
∆
in line, 2%
∆
in load in the 30% to 70% power region (QAF, QAL & QBV)
Isolation
• Command signal to load 1250VAC minimum
Linearity
• 2%, 30% to 70% power region (All units except QAD, QCA & QCD)
Off State Leakage Current
• 20mA @ 480VAC
SCR Protection
• l2t fuses provided, dv/dt 200V/ µsec minimum.
I2t are fast acting fuses designed to protect SCRs and capable of opening
(blowing) inside 1/2 cycle (2.3 msec). They are not designed for protection of
other parts of the heater system and should not be used in place of circuit
breakers or fusible disconnects.
• Q33 units equipped with MOV and snubber. Q01 & Q32 units, snubber only.
• (Q32) 3rd leg fuse kit may be used, but not required, with 3 phase- 2 leg models
Cooling
• Fans provided in 75A to 100A units must be supplied with 120VAC (or 240VAC),
20 watts fan power each
• All fans wired by the customer, Q01: 75A through 300A units, 1 fan; Q32: 30A
through 100A units, 1 fan; 150A, 200A, 300A units, 2 fans; Q33: 30A through
100A units, 2 fans; 150A, 200A, 300A units, 3 fans
• Natural convection only: Q01: 30A and 50A units
Heat Sink Thermostat. SCRs that incorporate a fan for forced air cooling can
reach unsafe temperatures if the fan fails. All Loyola SCRs with fan cooling
incorporate a heat sink thermostat to remove power from the SCR in case of fan
failure, filter blockage, or excess heat in the enclosure.
Agency Approval
• UL recognition to 300 Amps, UL873, File # E43684. Listed under UL508,
File #E73741
Mounting
• Orientation: Heat sink fins must be vertical
Operating Environment
• 32 ˚F to 122 ˚F/0 ˚C to 50 ˚C
• 0 to 90% RH, non-condensing
Weight
• lbs (kg)
Phase
Options
• Manual Control Kit (1K
Ω
potentiometer) #08-5362
• 240VAC fans in place of 120VAC fans
• 600VAC operation, consult factory
Amps 1ø/Q01 3ø,2 leg/Q32 3ø,3 wire/Q33
30 6 (2.7) 8 (3.6) 20 (9.1)
50 6 (2.7) 8 (3.6) 20 (9.1)
75 10 (4.5) 15 (6.8) 50 (22.7)
100 10 (4.5) 15 (6.8) 50 (22.7)
150 15 (6.8) 36 (16.3) 50 (22.7)
200 15 (6.8) 36 (16.3) 50 (22.7)
300 15 (6.8) 36 (16.3) 50 (22.7)