MK Plastics RBK IO&M - Manual (Page 5)

Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by moving the motor pulley on the motor shaft, or by
moving the entire motor along the motor mounting bracket. Fig. 8 illustrates correct and incorrect pulley alignment
.
Fig. 8 – Pulley Alignment
A recommended method of inspecting the pulley alignment is shown in Fig. 9. With the shorter leg of a carpenter’s square or
other straight edge lying along the case of the motor, adjust the position of the motor pulley (or the motor) until the longer leg of
the square is parallel to the belt. For more accuracy – use a laser alignment tool, if available. Read the instructions that come
with the kit.
Fig. 9 – Pulley Alignment Method
Wiring Installation
All wiring should be in accordance with local ordinances and the National Electrical Code, NFPA 70. Ensure the power supply
(voltage, frequency, and current carrying capacity of wires) are in accordance with the motor nameplate.
Lock off all power sources before unit is wired to power source.
1. Remove the weather cover as described on page 2. to get access to the motor.
2. Disconnect switch will normally be mounted on the exterior of the fan housing, so the fan should be positioned with the
junction box towards the power supply.
3. Connect supply wiring to the disconnect switch (non-fused standard). Check the wiring diagrams on the motor for
connections. The power leads must be protected at the point of distribution in accordance with the fan data plate.
4. Run the wires from the disconnect switch through the fans cooling tubes on the side and complete the wiring to the
motor.
5. Supply voltage to the power ventilator should not vary by more than 10% of the value indicated on the unit data plate.
Phase unbalance must not exceed 2%.
WARNING: Failure of motor due to operation on improper line voltage or with excessive phase unbalance constitutes product
abuse and may cause severe damage to the unit’s electrical components.
Follow the wiring diagram in the disconnect switch and the wiring diagram provided with the motor. Correctly label the
circuit on the main power box and always identify a closed switch to promote safety (i.e. red tape over a closed switch).
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