8’ - 24’ POWERFOILPLUS™, POWERFOIL™, & WICKERBILL FANS
WWW.BIGASSFANS.COM ©2010 DELTA T CORP. DBA BIG ASS FAN ALL RIGHTS RESERVED
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WWW.BIGASSFANS.COM ©2010 DELTA T CORP. DBA BIG ASS FAN ALL RIGHTS RESERVED
8’ - 24’ POWERFOILPLUS™, POWERFOIL™, & WICKERBILL FANS
Additional Input Power Considerations
This section is meant to point out additional requirements that may need to be met for the fan system to operate properly. If addressed
prior to installation, the user can further guarantee a trouble free fan system.
Input Voltage Irregularities
The fan controllers are suitable for direct connection to input power within the rated voltage of the fan controller (see pp. 30, 73-76), but
are sensitive to rapid changes in supply voltage. Listed below are certain input power conditions that may cause nuisance tripping, such
as Overvoltage and Undervoltage faults. If any of the conditions exist as described below, you can install one of the devices listed under
the heading “Corrective Action” on the input side of the fan controller.
CAUTION: One device is required for each fan controller.
Input Power Condition
Corrective Action
Low Line Impedance (less than 1% reactance)
Install Line Reactor (consult your Big Ass Fans representative
for recommended part number)
Line has Power Factor Correction Capacitors
Line has frequent power interruptions (voltage sags or swells)
Line has intermittent noise spikes in excess of 6000V (lightning)
Phase to ground voltage exceeds 125% of normal line to line voltage Remove MOV jumper to ground or Install Delta/Wye Isolation
Transformer with grounded secondary (1:1 turns ratio).
Ungrounded distribution system
Supply transformer exceeds established kVA limit (see table below)
Install Line Reactor
More than one controller one per branch circuit
Supply Transformer kVA Limits
Controller Model #
kVA Limit
Controller Model #
kVA Limit
AB 120-1-1-1.0
N/A
AB 460-3-1-1.5
50 kVA
AB 230-1-1-1.0
30 kVA
AB 575-3-1-1.5
50 kVA
AB 230-3-1-1.0
30 kVA
AB 230-1-1-2.0
50 kVA
AB 460-3-1-1.0
30 kVA
AB 230-3-1-2.0
50 kVA
AB 575-3-1-1.0
30 kVA
AB 460-3-1-2.0
50 kVA
AB 120-1-1-1.5
N/A
AB 575-3-1-2.0
50 kVA
AB 230-1-1-1.5
50 kVA
KBDA 230-1-1-2.0
50 kVA
AB 230-3-1-1.5
50 kVA
KBDA 230-3-1-2.0
50 kVA
ATTENTION: Fan controllers found to be damaged by any of the above mentioned conditions may not be covered by Big Ass
Fans warranty policy.
Delta Secondary
There are many different arrangements available for industrial and commercial power distribution in the United States. The three most
common are:
• 480/277V Three Phase (Wye secondary)
, which provides 480V between phases, and 277V from each phase to Neutral / Ground.
• 208/120V Three Phase (Wye secondary)
, which provides 208V between phases, and 120V from each phase to Neutral / Ground.
• 240/120V Three Phase (Delta Secondary)
, which provides 240V between phases for three phase loads, 120V from phase “A”
and “C” to Neutral / Ground, and 208V from phase “B” to Neutral / Ground as shown below. In this transformer arrangement, phase
“B” is commonly referred to as a “Wild Leg” or “High Leg,” and shall be marked accordingly with an orange finish or other effective
means per NEC 110.15.
