3500/20 BENTLY Rack Interface Power Module

Description

3500/20 Due to the requirements for increased robustness in the TMR system, the TMR I/O

Module has a Velomitor interface that is different from the standard I/O Module’s

Velomitor interface. The effect of this difference is that the Velomitor signal input

to the I/O Module is 180 degrees out of phase from the correct Velomitor signal.

This inversion is compensated for in the TMR I/O Module. 3500/20 This means that when

you input a test signal using a signal generator or DC power supply the buffered

outputs on the front panel will be inverted in phase and will have a different DC

voltage than the input. This will not affect the actual vibration readings in the

Monitor.

3500/20 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 will cause a not OK

condition and the OK Relay to change state (de-energize). The Upper and Lower

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

1. Disconnect PWR, COM / A, and SIG / B field wiring from the channel

terminals on the I/O module.

2. Connect test equipment and run software as described in Section 5.1.7.1

(Test Equipment and Software Setup – Velocity), page 177.

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 3500/20 that the Channel OK State line in the Channel

   Status section of the Verification screen reads OK.

   6. Verify that the OK relay on the Rack Interface I/O Module indicates OK

   (energized). See the 3500/20 Rack Interface Module Operation and

   Maintenance Manual, part number 129768-01.

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

   goes off (lower limit due to the inversion on the I/O Module). 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 Lower OK limit voltage displayed

   on the Verification screen is equal to or more negative than the following

   value.

   8. 3500/20 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.

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