Page 40
WELD SENTRY 2
VOLTAGE MEASUREMENT CHECK
If desired, the following procedure can be used to check the accuracy of the voltage measurement result.
Required Equipment
1. Stable DC Voltage Source (calibrated)
2. Precision Shunt (.01 to 10 milliohm resistance)
(2)
Setup Welder
1. Setup an appropriate weld schedule.
AC Welders: .5 - 1 Cycle, 20% Current (lowest transformer tap)
DC Welders Single Pulse, < 50 Watt*seconds Energy
Setup Sentry
2. Use
▼
to move to the Sentry Program line and enter:
Measurement Unit: Volt*Seconds
Lower
Limit:
None
Upper
Limit:
None
Sentry:
ON
3. Press [PROGl again to display the Sentry Program screen and enter:
Voltage
Gain
:
1
Current
Gain
:
4
Delay
Time
:
0.000ms
Measurement
Time
:
10
ms
4. Press [SAVE] to save the schedule and program in memory.
Test Procedure
1. Use weld cables to connect each end of the shunt to each output terminal of the power supply or
transformer.'
2. Attach the voltage pickup leads to the output of the Voltage Source.
3. Attach the current coil around one weld cable.
4. Set the voltage source to output 9 volts DC.
5. Fire the welder to trigger the Sentry.
6. The Weld Sentry measurement should equal 90 millivolt*Seconds ±: 2%.
7. If the voltage measurement is not correct, refer to Section 5.02 and adjust the voltage
input.
* If the current coil calibration will not be performed, you can fire the weld head across a length of
weld cable or any standard load of measured resistance.
Содержание WELD SENTRY 2
Страница 5: ......
