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General description
Instruction manual
IM1002004E September 2015 www.powerquality.eaton.com
IMPORTANT
Save these instructions. Please read this manual before
using equipment.
General description
The Power-Sure™ 700 is a continuous duty electronic
voltage regulator designed to supply reliable, clean
regulated power to critical loads. An efficient design with
state-of-the-art microprocessor controlled solid-state devices
provide immunity to all line disturbances.
The basic design consists of a three-phase triple-shielded
isolation transformer with seven separate voltage taps per
phase. Output regulation is achieved by monitoring the
input and automatically switching taps anytime the input
line sags or surges. The special process of triple-shielded
isolation transformers provide superior common mode and
transverse mode noise attenuation. Automatic switching
occurs during current zero, allowing noise-free switches
for both leading and lagging power factor loads that are
connected to the Power-Sure 700.
Monitor
Monitoring of the Power-Sure 700 is simple, clean, and
effective. Three green light indicators are utilized to
display “POWER ON” (output line to neutral for each
phase) and one red light indicator to display “ALERT.” The
“POWER ON” display is connected directly to the output
that indicates the Power-Sure 700 is operating properly
with just a quick glance. The “ALERT” display represents
an overtemp problem when illuminated, and will shut down
the output, but cooling fans remain on. Overtemp thermal
sensors are strategically located at critical points on the
regulator assemblies and transformer. The main AC input
circuit breaker must be turned off in order to reset the
“ALERT” light.
Protection
Protection is accomplished very effectively to minimize
failures and the cost of repairs. A total of four major devices
protect the Power-Sure 700.
1. The input is protected with an integrally mounted
AC circuit breaker for abnormal current overloads
and provides a convenient means of disconnecting
utility power.
2. The electronic regulating devices are protected
with fast-acting semi-conductor fuses. These fuses
are designed to clear before damage occurs to the
more expensive SCR regulating devices. The main
transformer is protected by fuse links connecting the
SCR regulators together, and are designed to clear in
the event that two or more SCRs should fail. This will
prevent a transformer tap short and the possibility of
transformer failure.
3. Overtemp sensing devices are mounted at critical
points on the SCR regulating assembly and the main
transformer. When an overtemp condition exists,
the “ALERT” light will illuminate and hold until the
overtemp is corrected. There are no automatic shutoff
circuits for the “ALERT” condition. The main AC input
breaker must be turned off in order to reset the
“ALERT” light.
4. Optional dedicated surge protective device can be
installed internally if requested at time of order. This
surge suppression device (SPD) is a CVX 50 kA SPD
for Power-Sure 700 units 50 kVA and below, and
CVX 100 kA SPD for Power-Sure 700 units 75 kVA
and above. This unit provides effective transient voltage
surge suppression and will help to prolong the life of
the Power-Sure 700.
