Watlow QPAC Modular SCR Power Control Service Bedienungsanleitung PDF herunterladen (Seite 6)

6 WATLOW QPAC Service Manual

Overview, Chapter 1

Specifications

QPAC Specifications

Operation

• Modular control base with plug-in card and transformer

• Plug-in control cards

• Solid state contactor, AC or DC input

• Burst firing (zero cross) control, fixed or variable time base

• Phase angle control with soft start and current limiting, or digital input

• Plug-in transformers (50/60Hz)

• 120 VAC operation

• 208/240 VAC operation

• 380 VAC operation

• 415 VAC operation

• 480 VAC operation

• 600 VAC operation, consult factory

• Power bases

• Single phase (Q01), 1 pair of SCRs

• Three phase (Q32), 2 leg control, 2 pair SCRs.

Resistive load only, balanced or unbalanced, burst firing (zero cross) only

• Three phase (Q33), 3 pair hybrid SCRs/diodes

Recommended for phase angle only with balanced load.

Control Cards

• (QCA) Solid state contactor, AC Input (08-5285)

• 120 VAC @ 30mA minimum

• AC signal input sources (ie., Triacs or mechanical relay outputs with noise

suppression) require customer supplied resistors across the power control

AC command signal input terminals to prevent false firing.

• 24 VAC input, 200Ω/10 watts typical

• 120 VAC input, 1KΩ/25 watts typical

• 240VAC input, two 1KΩ/25 watts in series typical

• (QCD) Solid state contactor, DC Input (08-5286)

• ON, 4 to 10VDC; OFF, 0VDC

• Built-in noise reduction network

• (QBF) Burst firing (zero cross) control Fixed Time Base (08-5289)

• Process input factory set @ 4-20mA

• Input impedance 250Ω (clip resistor for 5KΩ voltage input)

• Time Base 4 seconds (clip resistor for 1 sec)

• (QBV) Burst firing (zero cross) control , Variable Time Base (08-5342)

• Process input factory set @ 4-20mA

• Input impedance 250Ω (clip resistor for 5KΩ voltage input)

• Bias and Gain card optional

• (QAF) Phase angle control (08-5288)

• Process input factory set @ 4-20mA

• Input impedance 250Ω (clip resistor for 5KΩ voltage input)

• Soft start 10 sec (approximately)

• (QAL) Phase angle control with current limit: (08-5411)

Some heater elements change resistance during their operation, (i.e., silicon

carbide). In order to control at a slow ramp, it is often advantageous to limit the

current. Sensing the current is via a current transformer. This is NOT a means

of protecting the SCR.

• Process input factory set @ 4-20mA

• Input impedance 250Ω (move jumper for 5KΩ voltage input)

• Soft start 10 sec (approximately)

• Current transformer included

• Current Limiting.

• (QAD) Phase angle control with digital input (08-5314)

• Remote digital phase control

• Interface, Centronics® parallel, 8 lines

• Power steps, 256

1 2 3 4 5 6 7 8 9 10 11 ... 42 43

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