Mitsubishi Electronics FR-A500L

PROTECTIVE FUNCTIONS

Operatio

n Panel

Display

(FR-DU04)

Paramete

r Unit

(FR-PU04)

Name

Description

E.CTE 

Operation panel power

short circuit

When the operation panel power (P5S of the PU connector) is shorted,

this function shuts off the power output. At this time, the operation

panel (parameter unit) cannot be used and RS-485 communication from

the PU connector cannot be made. To reset, enter the RES signal or

switch power off, then on again.

 

Brake resistor overheat

protection

Inverters of 7.5K or less contains a brake resistor. When the

regenerative brake duty from the motor has reached 85% of the

specified value, pre-alarm (RB indication) occurs. If the specified value

is exceeded, the brake circuit operation is stopped temporarily to protect

the brake resistor from overheating. (If the brake is operated in this

state, regenerative overvoltage shut-off will occur.) When the brake

resistor has cooled, the brake operation is resumed.

E.MB1 to

MB7  Brake sequence error

This function stops the inverter output if a sequence error occurs

during the use of the brake sequence function (Pr. 278 to Pr. 285).

E.14 E.14 DC fuse blown The inverter output will stop if the DC fuse blows.

E.15 E.15 Main circuit error

Brake unit cooling fin overheat, control board ambient temperature error,

output overcurrent, cooling fan power supply error, capacitor

overcurrent, cooling fin overheat, gate power supply error.

Refer to the next page (page 27) for details.

Note: 1. If Pr. 195 (A, B, C terminal function selection) is as set in the factory.

2. The terminals used must be allocated using Pr. 190 to Pr. 195.

3. External thermal relay operation is only activated when "OH" is set in any of Pr. 180 to Pr. 186 (input

terminal function selection).

4. Indicates that the stall prevention operation level has been set to 150% (factory setting). If this value

is changed, stall prevention is operated at the new value.

5. Resetting method

When the protective function is activated and the inverter stops its output (the motor is coasted to a

stop), the inverter is kept stopped. Unless reset, the inverter cannot restart. To reset the inverter, use

any of the following methods: switch power off once, then on again; short reset terminal RES-SD for

more than 0.1 seconds, then open; press the [RESET] key of the parameter unit (use the help

function of the parameter unit). If RES-SD is kept shorted, the operation panel will show "Err." or the

parameter unit will show that the inverter is being reset.