Technical information

230V FX Series Positioning Drive Reference Manual

3. Thermo Disc

85°C (185°F) thermal switch

Type 36T21 22228

UL File E19279

Additional protection against motor overload is provided by internal drive diagnostic

features. If normal operating parameters are exceeded, the seven segment diagnostic display

on this drive will indicate one of the fault conditions below, at which time power will be

removed from the motor (see “Troubleshooting” on page 145 for a complete description)

Site Requirements

The FX amplifier normally back-mounts to a standard metal NEMA (National Electrical

Manufacturers Association) enclosure.

AC line power for both the logic power and bridge power is connected to the screw terminals

on the bottom of the FX amplifier. The bridge AC power can be joined by external jumpers

or wired separately (see “Power Line Requirements” on page 17 for AC current

requirements).

If the bridge AC power is wired separately from the logic AC power, the logic AC power

must always be applied first during a power-up.

The internal AC power line protection varies according to the model. The FX-208 through

FX-455 and FX-6200 through FX-8400 provide internal fusing on the Logic AC inputs and

a thermal circuit breaker on the Bridge AC inputs. The FX-490, 4120 and 6120 drives have

internal fusing on the AC Logic inputs and a DC bus fuse for the Bridge AC input protection.

This DC bus fuse protects against failures that occur after the AC voltage has been rectified.

For all FX drives, it is strongly recommended (and required on the FX-208 through FX-6120

drives for UL compliance) that you provide external fusing. The following table shows the

fuse values for the FX-208 through FX-8400 drives.

Code on

Display

Fault Description

1 Indicates that the average current to the motor has exceeded the continuous current rating.

Indicates that one of two thermal switches in the motor (number 1 and number 2 above) has exceeded

the limit.

Indicates that the thermal switch on the power electronics heat sink (number 3 above) in the drive has

exceeded the limit. This may indicate that the drive and motor are undersized for the application.