maintenance/
troubleshooting
74
SYNRAD OEM v30 Operator’s Manual Version 2
Troubleshooting
In some cases, it is easier to troubleshoot the laser processing system by disconnecting field wiring from
the DB-9, or RJ45, connector and then installing the DB-9 Quick Start Plug to verify v30 laser operation.
If the laser was not shipped with a Quick Start Plug, you can fabricate one as shown in Figure below.
Pin 1
PWM Positive
Pin 6
PWM Negative
Pin 5
DC Out
Pin 9
Laser Enable
Pin 9
Pin 6
Pin 5
Pin 1
PWM Input BNC
Rear (Solder Side)
of Male DB-9
Quick Start Plug
Figure 5-2
DB-9 Quick Start Plug wiring diagram
Symptom:
■
The following status LED and I/O states exist:
LASE LED – Off
Lase Indicator
– Low (0V)
RDY LED –
Flashing
Laser Ready –
Low (0V)
Laser OK –
Low (0V)
PWR LED – Green
Overtemp Fault –
High (+5V)
Temperature OK –
Low (0V)
DC Voltage Fault – Low (0V)
Voltage OK
– High (+5V)
Possible Causes:
■
Air-/fan-cooled lasers – an over temperature fault has occurred because cooling fans are not provid-
ing adequate airflow to the laser.
Check that all cooling fans are clear of debris and are providing an airflow rate of at least 4.0 m
3
/min (140
CFM) per fan at a maximum static pressure of 13.1 mm H
2
O (0.52 in H
2
O). To allow for proper airflow,
cooling fans must have at least 57.2 mm (2.25 inches) of unobstructed clearance between the outside edge
of the cooling fan housing and any mounting surface or enclosure.
■
Water-cooled lasers – an over temperature fault has occurred because coolant temperature is above
22 °C (72 °F) or there is inadequate water flow through the laser.
Check that the chiller is maintaining a coolant temperature between 18 °C–22 °C (64 °F–72 °F) at a
flow rate of 3.8 lpm (1.0 GPM). If coolant temperature is OK, check the flow rate. If a flow meter is not
available, disconnect the cooling tubing from the chiller inlet (or the drain) and run the coolant for one
minute into a one-gallon container; you should have close to one gallon of coolant. If there is much less
than one gallon in the container, check the cooling path for kinked or pinched cooling tubes and check
the chiller for a clogged or dirty filter.
