6.
6.1
Dimmer Pack Calibration
Ramp Card Calibration
Calibration of COBO Ramp Cards is beyond the scope of this chapter . Calibra-
tion is done in the factory before shipment of the COBO 1.2Kw Pack and should
not be necessary in the field. All field adjustments relating to curve or to maxi-
mum output level should be accomplished with the Power Supply adjustment.
6.2 Power Supply Card Calibration
COBO Ramp Cards require a specific reference voltage from the Power Supply to
generate their 5 Volt reference ramp (5V •s• curve). The Power Supply is then
used to make any required adjustments in dimmer output curve using a true
RMS (AC+OC) meter. Adjustment is made with the Power Supply Card installed
in the
1.2Kw Pack.
60Hz systems require a 10.96VAC RMS reference and 50Hz systems require a
9.13VAC RMS reference from the power supply. For the phase A reference in
1.2Kw Packs, measure this voltage between J2 (Common) and J3 (Ref.) on the
Power Supply Card. For phase B and C, measure this voltage between J2 on
the Power Supply Card and the center tap of the adjustment potentiometer.
Compensation for different line voltages frequencies is by adjusting the Power
Supply, not the Ramp Card.
Phase A Adjust
n
"
"
"
"
:: Card Cage
"
"
"
(on Power Supply Card)
Figure 11. Reference Adjustment Locations
31
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