Xylem IM192R00 FloStandard SIMPLEX PUMP CONTROL PANEL - Manual (Page 7)


ITT
CENTRIPRO
Commercial Water Systems
COmbINaTION sTaRTER aNd
OvERlOad RElaY
FloStandard is furnished with a combination
starter and overload relay to protect the mo-
tor from overload during start-up or operation.
Panels designed for use on three phase power also
incorporate circuitry that will protect motors from
phase loss or phase imbalance, in addition to over-
load during start-up or operation.
Figure 2 – Starter/Overload Relay
The following are field adjustments and indications
are available and can be referenced from Figure 2
above:
• Setting based on Motor Service Factor: For
continuous-rated motors having a service
factor (SF) of 1.0, set the current adjustment
dial to 90% of the motor’s full-load current
(MFLC). For continuous-rated motors having
a service factor of 1.15 to 1.25, set the FLA
dial indicator current to the MFLC.
• Visible Trip Indication: A viewing window on
the front of the solid-state overload relay pro-
vides visible trip indication. A yellow marker
appears when the device is tripped.
When the overload relay detects motor current in
excess of 125% of the current adjustment dial set-
ting, the overload contacts open and the optional
auxiliary contacts change state (N.O. contacts
close and N.C. contacts open). The time required
for the overload relay to trip depends upon:
• Current value.
• Time elapsed since last trip.
The phase loss/phase imbalance circuitry can
detect a phase loss and initiate a trip within three
seconds. Phase loss detection extends to a phase
loss in either the primary or the secondary of a
wye-delta or delta-wye transformer. The circuitry
also detects a phase imbalance and initiates a trip
when any phase current drops 25% below or rises
25% above the average of the three phase cur-
rents.
Reset bar: The overload relay is reset by depress-
ing the reset bar on the front of the device. Since
the overload relay trip function is of the “trip-
free” design, it cannot be overridden by holding
down the reset bar.
Overload Relay power On light: A red LED
indicates that the power necessary to operate the
overload relay protective circuitry is present. This
power is derived from the current flowing in the
motor leads. When sufficient power is extracted to
enable normal operation, the LED blinks. It blinks
faster as the current being monitored increases.
Functional Test: To test for proper operation
of the overload contacts, de-energize the starter
and disconnect the control circuit power. With a
small, flat-blade screwdriver, slide the TEST switch
located on the bottom of the overload relay to the
right. This operates the trip mechanism, opening
the N.C. overload contacts at terminals 95 and 96.
Verify proper operation of the overload contacts,
and then reset the device by depressing the red
RESET bar. Reconnect the control circuit power
and reenergize the starter as required.
Inspecting and Replacing Contacts: Discoloration
and slight pitting do not harm contacts. Do not file
contacts; this wastes contact material. Replace con-
tacts only when worn thin. To inspect or replace
contacts, disconnect all power. Do not remove any
wiring. Loosen the four captive screws holding
the contact actuator to the contact block. Lift the
contact actuator to expose the contacts. Manually
operate the contactor or starter with a screwdriver
by pushing down the contact carrier. There is a
step on the outside of the contact carrier suitable
for this use. Replacement starter contacts may be
obtained from a local electrical supply house.