uniphy Phyaction 740 Series, Информация о сервисе

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Service Information Phyaction 740 & 790-series Page 30
is not activated within 40 msec ERROR 65 is generated, with error code 0.
2 Test if the safety relay contacts open. If the above test passes but a closed circuit is detected (Vmf
below 20.7 V, on ADC 3.73 V, ADC-value 02FBh) the same error is generated,
ERROR 65 . This
time the error code is 1 and the error value the measured ADC-value.
This test completes the verification of the safety relay.
150% SAFETY LIMIT CHECK
In this test sequence the 150% comparator circuits are tested. The safety relay is energized and a closed
output circuit is created by switching on the dummy relay. By programming the DAC two currents are
generated one representing a value below 150% (1.5 mA) and one above 150% (8 mA). The limit checks
are done on each half of the output stage.
1
Test with a current below 150% whether no error condition is generated. If the errorline is activated
ERROR 66 is reported, with error code 0.
2 Test one half of the safety circuit (comparator 1) for 150% limit. If the errorline is not activated
with the 150% current ERROR 66 is generated, with error code 1.
3 Test the other half of the safety circuit (comparator 2) for 150% limit. The error messages is also
ERROR 66 , with error code 2.
This completes the verification of the 150% limit check circuits.
MAXIMUM CURRENT SAFETY LIMIT CHECK
This comparator checks for currents above the maximum allowable output current and should report an
error if the output current rises above 110% of the maximum allowable. The maximum current is
simulated by test lines connected to the comparator network.
1
Simulate normal current with test lines TST2. If the errorline is activated ERROR 67 will be
generated, with error code 0. This also checks whether the 11 k
Ω
input resistors are installed.
2 Simulate 110% current with TST1. If the errorline is not activated ERROR 67 is generated, with
error code 1.
This completes the maximum current safety limit check.
OTHER TESTS OF THE CURRENT GENERATOR
1
Test of the dose regulator guard circuit. Test line TST0 is activated, if the errorline is not activated
within 3 msec
ERROR 56 is generated.
2 Dosage regulator at zero, checked by means of the potentiometer switch. If not at zero
ERROR 50 .
After these tests all test lines deactivated, the short circuit relay is switched off and the safety relay on.
5.3.3 Test ultrasound generator
TEST OF THE HEAD TYPES