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Installation and start-up 29
Helios Rectifier 25/48 Installation and User Manual
Rectifier meter accuracy
The rectifier's current meter is precise within + 2%.
Start-up and verification
Repeat the following steps for each rectifier in turn.
Procedure 4 - Starting up the rectifier
Step Action
1 Close the AC circuit breaker in the AC service (main) panel.
2 Connect an external meter to test points V- and V+ on the rectifier to be
tested.
3 Switch the AC circuit breaker of the rectifier. The voltmeter will indicate a
float voltage.
Note: If the float voltage remains at 0 V DC, verify that the input voltage is
within the specified range. If it stills remains at 0 V DC, refer to the
troubleshooting section of this manual.
4 Determine the system requirements for Float, Equalize and HVSD limits
found in User Manual 167-7011-010. If the rectifier's factory set limits
have to be changed, proceed as follows, otherwise proceed to step 13.
High Voltage Shutdown ( HVSD ) Adjustment :
5 With the DC circuit breaker OFF, keep the AC breaker on and turn the HVSD
potentiometer fully clockwise.
6 Turn the FLT potentiometer slowly clockwise until the output voltage
reaches the desired HVSD set point.
7 Slowly turn the HVSD potentiometer counterclockwise until the rectifier
shuts down and the float voltage starts to decay down to zero. Turn the
Float potentiometer counterclockwise two turns and reset the rectifier by
switching the AC circuit breaker OFF and then ON.
8 Adjust the Float voltage to the correct level.
Float Voltage Adjustment :
9 To adjust the float voltage use the FLT potentiometer. To increase the
voltage turn the potentiometer clockwise, to decrease it turn it
counterclockwise .
continued