Operating Mechanism Maintenance
1HSB515409-100 en rev2 21
1. Connect a time-meter across the signal contacts 20, 29, 291 and 292 in
accordance with the circuit diagram.
2. Measure the times t
1
, t
2
and t
3
3. Turn the switch “Local/Remote” to the “LOCAL” position.
4. Connect the time-meter across terminals X1:190 and X1:192.
5. Turn the switch “On/Off” to the “OFF” position and then the “ON” position.
6. Note down the times t
1
, t
2
and t
3.
7. Disconnect the time-meter.
8. Turn the switch “Local/Remote” to the “REMOTE” position.
Figure 4-1. Time measurement, contact travel.
Contact travel
Arcing contact
Closed
Auxiliary contact
Open
t
2
t
3
t
1
Time
t
1
ms Proportional to the contact’s opening speed.
t
2
ms Time that determines contact damping.
t
3
ms Proportional to the contact’s closing speed.
B20018
Contact travel
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