MR MESSKO MTRAB - Page 99

10 Maintenance, inspection and care
99BA6820378-03 EN
Starting a long test in normal operation
ü Device is not in the regeneration process (the silica gel is not being heat-
dried; the yellow LED is off).
1. Press the test button for a longer period and then release (hold down for >
3seconds).
2. The long test can only be interrupted within the first minute of starting the
long test by pressing the key for at least 5seconds. In this case, the inter-
ruption will be signaled by a flashing green LED and the device will be re-
set to its original status.
ð The long test will be signaled by the LEDs for the duration of the test
(approx. 10minutes) as shown in the figure above.
ð A heating test will be performed. In addition, the heating signaling re-
lay will be activated.
ð A 4...20mA signal will be issued cyclically at the analog outputs for
the duration of the test.
3. In the control room, check whether the heating signaling relay is ener-
gized.
4. Check whether the heat-drying process starts on the device.
5. Using a measuring device in the control room, check whether the signal at
the analog outputs rises from 4mA to 20mA and then drops to 4mA
again within one minute.
Figure72: Analog signal
6. In the control room, check whether the device error signaling relay is
deenergized and then energized again.