Functional Test - Mitsubishi Electric FR-A800 Series Beginner's Manual

Functional test

4.2 Functional test
For a functional test the inverter is operated with minimum external wiring. The motor should be al-
lowed to run free without any connected load. You need to check whether the connected motor runs
properly and that you can adjust its speed with the inverter. There are two ways to perform this test:
● Controlling the inverter with external signals
The commands for starting the motor in forward or reverse mode are activated with external
pushbuttons. Motor speed is adjusted with the help of the frequencies stored in parameters 4
through 6 (see section 6.2.4). To do this you can either connect switches to terminals RH, RM and
RL of the inverter or connect the appropriate terminals to the PC terminal with a wire jumper.
Speed setting
Some external components like pushbuttons and switches are required for this method but it has
advantages over performing the test with the parameter unit:
– When the inverter is switched on for the first time control with external signals is activated by
default – you don't need the parameter unit to switch to this mode.
– In normal operation inverters are also usually operated via external signals, either by activating
stored parameter values or by sending external analog setpoint values to the inverter.For
example, start commands can be sent by a PLC or executed manually with switches or
pushbuttons.
Testing the system with external signals enables you to simultaneously test the control inputs
for proper functioning.
4 - 2
Motor circuit
breaker
Q1
I
Power
I
supply
I
S1
Reverse
S2
Forward
PE
Inverter
R/L1
U
V
S/L2
W
T/L3
PC
STR
STF
RH Pr. 4 (50 Hz)
RM Pr. 5 (30 Hz)
Pr. 6 (10 Hz)
RL
Start-up