OPERATION SUMMARY - Section 3
3-14 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
3.3.5.5 TARGET/SEAL-IN TEST.
To check the target and seal-in features of a DC current-operated target:
1. Connect the relay, as shown in Figure 3.5. Select I4-DC current mode, and static operation mode.
2. Use the current preset feature to preset the DC current to the appropriate value (usually 0.2A or 2.0A).
This is done by setting [PREFAULT] off, pressing and holding the [CURRENT] button, and adjusting
the [MODIFY] knob. Release the [CURRENT] button when done.
3. Turn [PREFAULT] on.
4. Manually rotate the induction disk fully on the relay, and hold the main contacts closed. The target and
seal-in unit should operate. This can be verified on the MTS-1710 by observing the DC current jump
from basically zero to a new value, and seeing the [TONE] button LED turn off.
5. Release the induction disk, and the seal-in unit should continue to allow the DC current to flow.
6. Turn [PREFAULT] off and observe the seal-in unit drop out. The DC current suddenly will drop to
zero, and the [TONE] button LED will turn on.
The connections to the external stop trigger inputs are only to give visible/audible indication of the
contact status here. When the contacts are open, a DC voltage (from the DC current output) appears
across the contacts. This is sensed and the [TONE] LED (and tone, if enabled) is on. When the contacts
close, the DC voltage drops to near zero, and the [TONE] LED is off.