Watlow QPAC Modular SCR Power Control Service Bedienungsanleitung PDF herunterladen (Seite 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 (1KΩ 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)

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