Troubleshooting Most Common Problems; Battery Replacement - WEG SCA06 User Manual

Troubleshooting and Maintenance

7.3 TROUBLESHOOTING MOST COMMON PROBLEMS

Problem
Display will not turn
on
Differential circuit
breaker trips
Servomotor will not
spin
Motor speed varies
(oscillates)
Motor speed too high
or too low
Servomotor with
excessive vibration
Encoder simulation
output informing
pulses even with the
servomotor stopped
7
Real clock time
unadjusted

7.4 BATTERY REPLACEMENT

In order to replace the battery, remove the slot protecting cover 2 (or an accessory, according to
ACCESSORIES on page
control of the SCA06 must be energized at the moment of installing the battery in the control card.
Battery consumption with the servo drive energized: 1.5 µA.
„
Battery consumption with the servo drive de-energized: 22 µA.
„
Battery approximate duration with the servo drive de-energized: 01 year *.
„
* Consumption just for reference. For a precise estimate, contact the battery manufacturer.
7-2 | SCA06
Table 7.1: Troubleshooting most common problems
Item to be Checked
Control supply voltage (X5)
Differential circuit breaker
RFI filter
Wrong wiring
Analog reference (if used)
Wrong programming
Error
Motor blocked
Loose connection
Defective reference potentiometer
External analog reference variation
Speed regulator gains too low
Wrong programming (servomotor
model and reference limits)
Reference control signal (if used)
Motor nameplate data
Wrong programming (servomotor
model)
Speed regulator gains too high
Wrong programming (servo drive
model)
Speed regulator gains too high
Battery
8-2) located in front of the servo drive and then turn and remove the battery cover. The
Corrective Action
1. Check if the value is between 20 and 30 Vdc
2. Check if the polarity is correct
1. Check if the circuit breaker tripping current is too low
1. Disconnect the RFI filter inside the servo drive by removing the screw
on the side of the SCA06.
1. Check all the power and control connections. For example, the DIx
digital inputs programmed as enabling or external error must be
connected to +24 V.
1. Check if the external signal is properly connected
2. Check the state of the control potentiometer (if used)
1. Check if the parameters have the right values for the application
1. Check if the servo drive is not blocked due to a detected error condition
(see previous line).
2. Check if there is no short circuit between terminals X1:10 and 12 (short
circuit on the 24 Vdc supply).
1. In the servomotors with brake option, check its supply
2. Check if the machine does not have mechanical problems
1. Block servo drive, shut down supply and tighten all the connections
1. Replace potentiometer
1. Identify cause of variation
1. Review the setting of the speed regulator gains in real load condition
1. Check if the contents of P385 (servomotor model), P00121 (speed limit)
comply with the motor and application.
1. Check the level of the reference control signal
2. Check programming (gains and offset) of analog inputs
1. Check if the motor used is suitable for the application
1. Check programming of P385
1. Review the setting of the speed regulator gains in real load condition
1. Check the content of P385
1. Decrease a little the speed regulator gains (review speed regulator
setting).
1. See section 7.4 BATTERY REPLACEMENT on page 7-2
section 8.2