DETAILED OPERATION - Section 4
4-6
MTS-3000 OPERATION AND REFERENCE MANUAL
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FIGURE 4.5 TEST CONNECTIONS FOR SCR OUTPUT TYPE RELAY
4.5
CURRENT MODES
4.5.1
Current Range
The MTS-3000 has two current ranges which determine how the internal current amplifiers are configured
to perform different types of testing. Most testing can be done in the default 0-25A, Low Voltage range.
However, some applications, especially older high burden electromechanical ground protection relays,
may require the 0-12A, High Voltage mode. If a "Output Clip’ng" alarm appears while trying to generate
the required current, select the latter mode by entering the following key sequence: MENU | Settings | ACI
Range | 0-12A, High V |
It’s also possible in either of the above modes to parallel as many current channels as are available to
achieve higher currents than are available from a single channel. It’s important to note that paralleling
current channels will deliver more current and more power to the load, but won’t increase the available
compliance voltage. Parallel operation of multiple current channels requires that the amplitudes and phase
angles of each be set to the same values. See the parallel current mode section 5.2.4 for more details.
* Note that these are all the maximum values available. The individual parameters may peak at different
points, and all vary inversely with load impedance.
** These figures represent an MTS-3030 V/I module with both channels configured for current output.
Maximum Current, Voltage, Power Available*
Number of Channels
High Current Low Voltage
Low Current High Voltage
1
25A, 15V, 150VA
12A, 30V, 300VA
2**
50A, 14V, 250VA
24A, 28V, 400VA
3
75A, 15V, 425VA
36A, 30V, 600VA