3500/92-04-01 Bently sensor (part of turbine monitor)

Description

3500/92-04-01 The procedures for verifying channel values and corner frequencies require that

you use the following formulas to calculate the verification frequency.

Find the center of the Band-pass frequency range. Input the configured high

pass filter corner frequency and the 3500/92-04-01 low-pass filter corner frequency into the

formula below:

Frequency = (0.89 × HPF) + (0.1575 × LPF)

HPF = High-pass Filter Corner Frequency

LPF = Low-pass Filter Corner Frequency

If no filtering is configured, set the frequency of the function generator to 100 Hz.

3500/92-04-01 If a low-pass filter is configured and no high-pass filter is configured, use the

following to determine the HPF to use in the formula:

– If the units are integrated or rms, use a HPF of 10 Hz. For any other

configuration, use a HPF of 3 Hz.

If a high-pass filter is configured and no low-pass filter is configured, use the

following to determine the LPF to use 3500/92-04-01 in the formula:

– If the configuration is a single channel with no integration, use a LPF of

30 kHz.

– If the configuration is a single channel with integration, use a LPF of 14.5

kHz.

– If the configuration is a dual channel pair, 3500/92-04-01 use a LPF of 9.155 kHz.

The procedures for verifying channel values and corner frequencies required that

you use the following formulas to calculate the input voltage for full-scale. To

find the full-scale input voltage, use appropriate table for integrated or non

integrated units.

3500/92-04-01 The general approach for testing OK limits is to input a DC voltage and adjust it

above the Upper OK limit and below the Lower OK limit. This should cause a not

OK condition and cause the OK Relay to change state. The Upper and Lower

OK limits are displayed in the Verification screen on the test computer.

1. Disconnect PWR, COM, and SIG field wiring from the channel terminals on

the I/O module.

2. Connect test equipment and run software as described in Section 5.1.9.1

(Test Equipment and Software Setup – Acceleration).

3. Bypass all other configured channels.
4. Adjust the power supply voltage to -7.00 Vdc.
5. Press the RESET switch on the Rack Interface Module (RIM). Verify that the

monitor OK LED is on and that the Channel OK State line in the Channel

Status section of the Verification Display screen reads OK.

6. Verify that the OK relay on the Rack 3500/92-04-01 Interface I/O Module indicates OK

(energized). See 3500/20 Rack Interface Module manual, part #129768-01.

7. Increase the power supply voltage (more negative) until the OK LED just

goes off (upper limit). Verify that the Channel OK State line on the

Verification screen reads not OK and that the OK Relay indicates not OK.

Verify that the Upper OK limit voltage displayed on the Verification screen is

equal to or more positive than the input voltage.

8. Decrease the power supply voltage (less negative) to -7.00 Vdc.
9. Press the RESET switch on the Rack Interface Module (RIM). Verify that the

OK LED comes back on and the OK relay energizes. Verify that the Channel

OK State line in the Channel Status section reads OK.

10. Gradually decrease the power supply voltage (less negative) until the OK

LED just goes off (lower limit). Verify that the Channel OK State line in the

Channel Status section reads not OK and that the OK Relay indicates not

1. Verify that the Lower OK limit voltage displayed on the Verification

screen is equal to or more negative than the input voltage.

11. Increase the power supply voltage (more negative) to -7.00 Vdc.
12. Press the RESET switch on the Rack Interface Module (RIM). Verify that the

OK LED comes back on, the OK relay energizes, and the Channel OK State

line in the Channel Status section reads OK.

13. If you can’t verify any configured OK limit, go to Section 5.1.11 (If a Channel

Fails a Verification Test).

14. Disconnect the power supply and multimeter and reconnect the PWR, COM,

and SIG field wiring to the channel terminals on the Proximitor/Seismic I/O

Module. Press the RESET switch on the Rack Interface Module (RIM) and

verify that the OK LED comes on and the OK relay energizes.

15. Repeat steps 1 through 14 for all configured channels.
16. Return the bypass switch for all configured channels back to their original

setting

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