Operation
For suspected issues regarding SN Spray Unit operation, observing and recording motor current and voltage
during operation is a good starting point. The normal operating values can be referenced from initial Startup &
Operation records and/or from the Wiring document. In addition to motor voltage and current measurements,
with power isolated, continuity (ohm) value measurements are helpful in pinpointing issues.
Check
Reading
Flow Check Visual
Flow Check Auditory
Electric measurements should only be performed
by qualified personnel
Single Phase
Three Phase Only
Source Voltage Reading (while unit is running)
L1:L2
L1:L2
L2:L3
L3:L1
Amperage Reading (while unit is running)
Reference Wiring Full Load / Max Load
L1
L1
L2
L3
Continuity Check (Motor Wi Wire)
Reference Wiring for Line to Line Ohms
L1:L2
L1:L2
L2:L3
L3:L1
Discontinuity Check (Power to Ground)
Should be Open to Ground
L1: GND
L1: GND
L2:GND
L3:GND
Figure 1:
Flow Check
REVERSE
FWD
FWD
Symptom
Possible Issue / Remediation
Motor Amperage is low
Blocked pump inlet screen, clean debris from inlet
Blocked spray nozzle(s), clean spray nozzle(s)
Broken, severely worn coupling between pump and motor,
pump and/or motor replacement
Motor Amperage is high
Low / Unbalanced line voltage, check source power
Phase loss, check source power
Short to ground, check continuity to ground leads, bad electric
cord, splice, or motor failure, replace faulty component(s)
Motor or pump failure, replace motor and/or pump
Fault Message from Three-Phase Motor
Protection device
Reference motor protection device manual for detailed
problems/conditions resulting in fault message.
Rotation Check
-
(Three Phase Only)
If wiring was disconnected during troubleshooting steps, the
motor rotation needs to be checked. With someone observing
the SN Spray Unit, briefly turn the unit on for several seconds
and observe the flow pattern, look for how far out the spray
reaches. Turn unit off, isolate power, and have a qualified
person switch 2 of the 3 motor leads of outgoing power.
Repeat operation again for several seconds and observe the
SN Spray Unit flow pattern again. Determine which wiring
configuration produced the flow pattern that reaches out the
furthest and finalize with that wiring of the outgoing power
leads. See Figure 1 for proper flow direction.
© 2020 Ixom | www.medoraco.com | 866 - 437 - 8076 | info@medoraco.com
Troubleshooting
SN Troubleshooting
1981_10044_20200527
O&M_SN10_10030_10104_20201006 - 9
