Technogym Forma Service Maintenance Manual page 54

(2) Disconnect the filter supply cables and place the tester probes across them. The measured
voltage should be 220 VAC.
(3) Disconnect the filter output cables and place the tester probes across the filter terminals. The
measured voltage should be 220 VAC.
This error may be generated even by brief drops in the line voltage due to overloads or
other causes. Therefore, it can be very useful to check the value of the mains voltage
recorded in the inverter memory at the time when the error occurred. To obtain the
mains voltage, the displayed value must be divided by 0.141 .
Page 6.14
FORMA: Service & Maintenance manual - rev. 3.0