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During start up, the current of the Feed Water Pump Alternating Current Electric Motor surges to "Locked Rotor"
or "Starting Amps" amperage for a fraction of a second after which the Electric Motor begins to rotate. After the
Electric Motor achieves full RPM rotation the current drops to normal running load. This process will take less than
1/2 second.
Therefore, the maximum surge current that the power source must be able to deliver equals the Feed Water Pump
Electric Motor starting amperage listed in the Specification Chapter of this manual. If the AC Power Source (AC
Generator or Dock Power) is insufficient the Ultra Whisper Electric Motor will not gain the full RPM speed needed
for it to switch to running amperage mode, will consume "starting amps" amperage continually, and will either trip
the power source circuit breaker or overheat and short out. Similar results will occur if the Frequency (Hz or Cycles)
drop below the minimum requirement, which will occur from a weak AC Generator that slows down when a load is
applied to it. This is an installation problem (insufficient power supply), it is not an Ultra Whisper problem.
Direct Current Powered Systems:
During start up, the current of the Feed Water Pump Direct Current Electric Motor draws high amperage for a
fraction of a second after which the Electric Motor begins to rotate. After the Electric Motor achieves full RPM
rotation the current drops to normal running load. This process will take less than 1/2 second.
Therefore, the battery bank power source must be fully charged and of sufficient amperage storage capacity to
provide and maintain the full voltage (12 VDC or 24 VDC as appropriate) at the instant of starting the Feed Water
Pump Electric Motor. If the battery bank power is insufficient the Ultra Whisper electronic circuit may "drop out"
due to power loss before the Electric Motor even begins to rotate. This is an installation problem (insufficient power
supply), it is not an Ultra Whisper problem. Low DC voltage to the Feed Pump electric motor will also be caused by
insufficient diameter power cables connected from the battery bank, through the boat's circuit breaker, and on to
the Ultra Whisper controller.
Power Source Requirements:
Check line voltage and frequency to ensure that it agrees with the system nameplate. Grounding and circuit
protection should be done in accordance with National Electrical Code. See connection diagram on nameplate of
motor or refer to the diagrams within this manual.
Voltage
DC Systems
12 VDC
24 VDC
AC Systems
120 VAC
230 VAC
100 VAC
220 VAC
Feed Pump Motor Electrical Specification
12 and 24 VDC
Nominal Operating Amps
Maximum Motor Amps
Starting Amps
Horse Power
Recommended Circuit Breaker
Minimum Size Power Wire AWG
66
HZ (AC)
Min. HZ
N/A
N/A
N/A
N/A
60 HZ
57 Hz
60 HZ
58 Hz
50 HZ
48 Hz
50 HZ
48 Hz
Max. HZ
Min. Voltage
N/A
11 VDC
N/A
22 VDC
62 Hz
108 VAC
62 Hz
207 VAC
52 Hz
90 VAC
52 Hz
198 VAC
UW 400
12V / 24V
21/10.5
28/13.4
45/22.5
0.3
50/25
6/8
Electrical Information
Max. Voltage
15 VDC
30 VDC
132 VAC
253 VAC
110 VAC
242 VAC
UW 600
24V
33/16.5
39/19.5
65/32.5
0.5
70/35
6/8
Ultra Whisper 400-600
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