Watlow QPAC - Manual (Page 26)

26 QPAC User's Guide Appendix
Specifications
QPAC Specifications
Operation
• Modular control base with plug-in card and transformer
• Plug-in control cards
Solid-state contactor, Å (ac) or Î (dc) input
Burst fire control, fixed or variable time base
Phase angle fire control
Phase angle control with soft start and current limiting
• Plug-in transformers (50/60Hz)
• 120, 208, 240, 277, 380, 415, 480, 575VÅ(ac) operation
Power bases
• Single-phase (Q01), 1 pair of SCRs
• Three-phase (Q32), 2-leg control, 2 pair SCRs. Resistive load only, burst
firing only.
• Three-phase (Q33), 3 pair hybrid SCRs/diodes. Recommended for phase
angle only with balanced load.
• 120V~ (ac) through 575VÅ (ac)
• 150 through 1,000 amps per switched leg.
Agency Approvals
• UL 508 listed and cULus up to 1,000 amps on Q01 and Q32 models, File
#E73741.
• UL 508 listed and cULus up to 300 amps only on Q33 models, File
E73741.
SCCR - Short Circuit Rating
• UL witness tested to 200,000A available fault current Q01, Q32 150-1000A
to 480VÅ (ac) Q33 units and over 480VÅ (ac) units not tested
Control Card Inputs
CA Solid-state contactor, ac input
• 120VÅ (ac) @ 30mA minimum
• Å(ac) signal input sources (i.e., triacs or mechanical relay outputs with
noise suppression) require customer supplied resistors across the power
controller Å(ac) command signal input terminals to prevent false firing.
24VÅ (ac) input, 200Ω/10 watts typical;
120VÅ (ac) input, 1kΩ/25 watts typical;
240VÅ (ac) input, two 1kΩ/25 watts in series typical
CD Solid-state contactor, dc input
• On, 4 to 10VÎ (dc) @ 0.5mA; off, 0.5VÎ (dc)
• Built-in noise reduction network
BF Burst firing control fixed time base
• Process input factory set @ 4 to 20mAÎ (dc)
• Input impedance 250Ω (clip resistor for 5kΩ voltage input), or manual con-
trol input
• Time base 4 seconds (clip resistor for 1 sec)
BV Burst firing control, variable time base
• Process input factory set @ 4 to 20mAÎ (dc)
• Input impedance 250Ω (clip resistor for 5kΩ voltage input), or manual con-
trol input
AF Phase angle control
• Process input factory set @ 4 to 20mAÎ (dc)
• Input impedance 250Ω (move jumper for 5kΩ voltage input), or manual
control input
• Soft start approximately 6 seconds upon power-up, 1 second upon set
point change
AL Phase angle control with current limit
• Process input factory set @ 4 to 20mAÎ (dc)