ABB PFEA111/112 optical disc indenter tension controller

Description

PFEA111/112 For timing tests, the signal generator must be capable of triggering into step-wise

changing of frequency or ramping down to a pre-selected frequency in only a few

milliseconds.

 Connect the Signal Source and PFEA111/112 Timer Start triggers as shown in

FIGURE 7–12: Frequency element testing on page 7–44.

 Set the voltage to rated VT secondary value, the current to rated CT

secondary, and the pre-trigger frequency to the nominal frequency (60

or 50 Hz).

If current sensing is not enabled, it is not necessary to connect the

current signal.

 Set the post-trigger to 0.5 Hz PFEA111/112 below the setting for underfrequency 1.

Reset all targets and relays, if necessary.

 Reset the timer.

 Initiate the frequency step and timer start.

The Interval Timer will record the operating time of element. Compare

this time to the S4 ELEMENTS  FREQUENCY  UNDERFREQUENCY 1

 UNDERFREQUENCY 1 DELAY setpoint value:

Provided that the operate times are not scattered over a wide range, it may be desirable to

repeat this test several times and average the results. If there is a wide scatter, verify the

test setup and ensure the signal source behaves in a consistent manner.

PFEA111/112 Current input function (voltage input disabled):

 If the frequency elements are using the winding 1 phase A current signal

as a source, verify the operation of the element using the instructions

below.

 Using the variable-frequency current source connected to terminals H1

and G1 with no voltage connections, set the frequency to 60.00 Hz (or

50.00 Hz) and the amplitude to the rated CT secondary current.

 Monitor the appropriate trip and auxiliary relays.

 Reset all alarms and indications.

The display should remain unchanged with no trip indications.

 Slowly decrease the frequency until the output relay(s) operate.

Check that the frequency at which operation took place is the selected

frequency setting.

 Slowly reduce the current.

 Note the current at which the output relay(s) reset.

 Check that this dropout current is the minimum operating current

selected in the settings.

Note

If current sensing is not enabled, then the element will continue working all the way

down to a current level of 0.02 × CT A.

 Increase the current back to nominal. PFEA111/112 Verify that the relay(s) operate.

 Check that the Trip and Pickup LEDs are on and one of the following

trip messages is displayed:

LATCHED: Underfrequency 1 or OPERATED: Underfrequency 1

 Slowly increase the frequency until the Pickup LED and output relays

reset.

 Note the dropout level, which should be the pickup plus 0.03 Hz.

 Check that the Trip LED is still on.

The trip message remains on if the UNDERFREQUENCY 1 TARGET

setting is Latched; if set to “Self-Resetting”, the message resets when

frequency is above the setpoint.

For timing tests, the signal generator must be capable of triggering into step-wise

changing of frequency or ramping down to a pre-selected frequency in only a few

milliseconds.

 Connect the signal source and timer start triggers as shown in FIGURE

7–12: Frequency element testing on page 7–44.

 Set the current to rated CT secondary value, no voltage connection, and

the pre-trigger frequency to the nominal frequency (60 or 50 Hz).

 Set the post-trigger to 0.5 Hz below the underfrequency 1 setting.

If necessary, reset all targets and relays.

 Reset the timer.

 Initiate the frequency step and timer start.

The Interval Timer will record the operating time of element.

 Compare this time to the S4 ELEMENTS  FREQUENCY 

UNDERFREQUENCY 1  UNDERFREQUENCY 1 DELAY setting

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