AIR-COOLED FLUID COOLER
32 • Air-Cooled Condenser Manual
7.6.5 If the motor does not operate, proceed to next steps
• Confirm there has been no damage due to water or excessive moisture into the
module’s terminal box.
• Check for signs of water penetration into the motor’s terminal box. Typically, this
can be confirmed by the presence of a white, powdery residue on the inside or
under the terminal box or around the cable gland or threads in any one of the three
ports. Water entry is a result of a loose terminal box cover, loose sealing nuts on
the cable gland, the body of the cable glands not tightened ensuring a seal between
the housing and the cable gland or missing or improperly installed O-rings.
Evidence of water entry may indicate other damage and the motor module should
be replaced.
7.6.6 Confirm Incoming Voltage
• Check the fuses, circuit breakers, motor or any device that controls power to the
motor.
• Confirm the power lead insulation or a loose crimp on a contact tip is not preventing
an electrical connection with the motor terminals.
• Confirm that the correct AC voltage is present on all three phases at the fan
terminals including a good ground connection.
• Check for damage or any short in the power leads to the motor.
• To simplify troubleshooting, all the control wiring at KL3 and alarm relay wiring KL2
should be labeled, capped or taped and removed from the motor. This will prevent
any external issues from effecting the troubleshooting.
7.6.7 Checking DC Outputs from the Motor
• After the correct AC voltage has been confirmed and with the power still applied to
the module, the low voltage DC outputs at KL3 should have the following readings:
• 20V and GND = 20VDC
• 10V and GND = 10VDC
• If either of these readings are not present, there probably is a defect internal to the
motor (the module should be replaced).
• If the readings are correct, the fan can be made to operate at full speed by
connecting a jumper wire between +10V and 0-10V PWM.
To Next Page
Loading...
