AXEON Marathon Motor - Manual (Page 8)

to Table 3-5 values. Definite purpose VFD motors may
accommodate longer cable lengths. For additional
information contact motor manufacturer.
Table 3-5 Max Cable Lengths General Purpose Motors
These values are based on 3 kHz carrier frequency. Add
suitable VFD output-side filters when exceeding the listed
values.
Frame Size 230V 460 V 575 V
NEMA 56-320 600 ft. 125 ft. 40 ft.
NEMA 360-5011 1000 ft. 225 ft. 60 ft.
IEC 80-200 180 m. 40 m. 12 m.
IEC 225-280. 300 m. 70 m. 18 m.
3.3.5.3 VFD Grounding: Equipment grounding conductors
may be run in the same conduit as the AC motor power leads.
This wire must be used as the equipment ground for the motor and
not as the fourth current carrying wire of a “WYE” motor circuit.
The grounded metal conduit carrying the output power conductors
can provide EMI shielding, but the conduit does not provide an
adequate ground for the motor; a separate grounding conductor
must be used. Grounding the motor neutral (WYE) of a VFD
powered motor may result in a VFD ground fault trip. Improper
grounding of an inverter fed motor may result in frame voltages in
excess of 500 Volts. Refer to Grounding section 3.4.4
3.3.5.4 VFD – Single Phase:
CAUTION : SINGLE PHASE MOTOR FAILURE:
Single Phase motors are NOT suitable for use on VFD power.
Connecting a Single Phase Motor to a VFD voids the warranty.
3.3.5.5 Stray Voltage on Accessory Leads:
VFD’s will couple stray (common-mode) voltage to motor-
mounted RTDs, thermistors, thermostats and space
heaters. The leads of these elements must be properly
insulated and control input circuits must be designed to
withstand this common-mode voltage.
3.3.6 ACCESSORIES / PROVISIONS:
3.3.6.1 General: Carefully read and understand the accessory
manufacturer’s instructions, supplied with motor. Contact the
manufacturer for additional information.
3.3.6.2 Brake Motors :
CAUTION : Vertical Motor Premature Brake Failure
Motors with brakes that are designed for vertical applications are
equipped with springs to support the brake pressure plate.
Mounting a horizontal brake motor vertically shaft up or down may
require a pressure plate spring modification. Failure to modify the
brake for the vertical application may result in premature brake
failure. If in question, consult brake literature or brake
manufacturer.
Brake Solenoid Wiring: Do NOT connect the brake
solenoid to the output of a VFD. The brake solenoids must be
wired to 50/60 Hz line power
3.3.6.3 Space Heaters:
Motors provided with space heaters have two leads that are
brought into the conduit box or into an auxiliary box. These leads
are marked ”H1”, “H2” (”H3”, “H4” if a second space heater is
supplied). See the space heater nameplate on motor for heater
rating.
WARNING: DIVISION 2 EXPLOSION HAZARD
The space heater temperature rating when used in Class I,
Division 2 motors shall
NOT exceed 80% of the auto ignition
temperature of the hazardous gas or vapor. See the space heater
nameplate on motor for heater Temperature Code and heater
rating. Failure to follow this instruction could result in serious
personal injury, death and/or property damage
3.3.6.4 Thermal Protection:
General Information: When thermal protection is provided, one of
the following will be stamped on the nameplate:
1.
“THERMALLY PROTECTED” This motor has built in thermal
protection. Thermal protectors open the motor circuit
electrically when the motor overheats or is overloaded. The
protector cannot be reset until the motor cools. If the
protector is automatic, it will reset itself. If the protector is
manual, disconnect motor from power supply. After protector
cools (five minutes or more) press the reset button and
reapply power to the motor. In some cases a motor is marked
“Auto” and the connection diagram on the motor will identify
T’Stat leads – see “2 ” below. (See warnings on Manual and
Automatic reset protectors - section 1.1)
2. “WITH OVERHEAT PROTECTIVE DEVICE”: This motor is
provided with an overheat protective device that does not
directly open the motor circuit. Motors nameplated with this
phrase have either thermostats, thermisters or RTD’s. The
leads to these devices are routed into the motor conduit box
or into an auxiliary box. The lead markings are defined on the
nameplate (normally “P1”, “P2”) . The circuit controlled by the
overheat protection device must be limited to a maximum of
600 volts and 360 volt-amps. See connection decal provided
inside the terminal box cover. Failure to connect these over
temperature devices (when provided) will void the warranty.
WARNING: EXPLOSION HAZARD
For Hazardous Locations motors provided with thermostats
UL and the NEC require connection of thermostat leads into
the control portion of a manual reset start circuit. Failure to
follow this instruction could result in serious personal injury,
death and/or property damage
Resistance Temperature Detectors (RTD): When winding
and/or bearing RTDs are provided the RTD lead markings are
defined on the nameplate. (Normally “R1”, “R2”, “R3” etc.)
3.3.6.5
RTD Alarm & Trip Settings:
Tables 3-6 & 3-7 are suggested initial RTD alarm and trip settings.
For motors found to operate significantly below these values the
settings may be reduced accordingly.
Table 3-6 Winding RTD – Temperature Limit (ᑻᑻᑻᑻC)
40 ᑻᑻᑻᑻC Max Ambient
Motor Load
Class B Temp
Rise≤ ≤ ≤ ≤ 80ᑻᑻᑻᑻC
Class F Temp
Rise≤ ≤ ≤ ≤ 105ᑻᑻᑻᑻC
Alarm Trip Alarm Trip
Up to 1.0 SF 130 140 155 165
>1.0 to 1.15 SF 140 150 160 165
Table 3-7 Bearing RTD – Temperature Limit (ᑻᑻᑻᑻC)
40 ᑻᑻᑻᑻC Max Ambient
Ambient Alarm Trip
Up to 40 ᑻᑻᑻᑻ C 95 100
> 40 ᑻᑻᑻᑻ C 110 115
Bearings that are
Heat Stabilized to
150 ᑻᑻᑻᑻC
130 135
3.3.7 GUARDS:
WARNING: ROTATING PARTS HAZARD
When devices are assembled to the motor shaft, be sure to install
protective devices such as belt guards, chain guards, and shaft
covers. These devices must protect against accidental contact with
extremities, hair, and clothing. Consider the application and provide
guarding to protect personnel. Remove all unused shaft keys and
loose rotating parts to prevent them from flying off and causing
bodily injury. Failure to follow this warning could result in serious
personal injury, death and/or property damage.