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USER’S MANUAL

You enter a current and/or time limit into Display #1 while placed in the

appropriate function using the and buttons and then acti-

vate/deactivate the protection with the button. These functions are

primarily provided as a means to protect sensitive devices against accidental

overheating.

The output will be cut off when the applied current exceeds the specified limit

by a 10 per cent. While the Tlim protection applies to the time for which the

output is ON, The Ilim protection works only with the current taps, not with the

voltage taps Out1 or Out2.

Testing Instantaneous Overcurrent

Instantaneous elements trip usually before the PTE-100-C PRO’s digital

ammeter stabilizes itself on the Display #2, thus being impossible to know

the real current value that has caused the relay to operate.

Furthermore, some instantaneous protections are set to such a high current

value that it might damage the relay if sustained during the time that it

usually takes to regulate with a reasonable accuracy.

If you meet any or both of these situations when testing instantaneous over-

current relays, use the

I max, I lim and T lim functions as follows:

1) Check first that the unit’s output is deactivated and the variac is

placed at its minimum “0” position.

2) Connect the current input from the relay to the current output tap

that best accommodates the intended injection values. Flag the se-

lected output by means of the button. Connect also now

the relay’s trip contact to the PTE-100-C PRO’s black/green moni-

tor inputs, so that the unit can detect the relay’s operation and stop

the test appropriately. Refer to the Timer control section above for

details on how to setup the various timer start/stop modes.

3) Select the

Imax

function and activate it by pressing briefly.

Its LED indicator will toggle from slow to fast blinking. In the

Imax

mode, the PTE-100-C PRO’s ammeter works upwards only, i.e., it

shows the maximum injected current since the last time the output

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SMC Networks PTE-100-C PRO User Manual

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