Testing Calibration and Relays
Entek IRD 6652 DSP Protection Monitor
41
Example:
Transducer type
403
Programmed parameter
(UNITS 1)
mils pp
Programmed range
(SCALE 1)
10
Gap voltage low
(TX LO 1)
-18.00
Gap voltage high
(TX HI 1)
-2.00
From the table above, the transducer sensitivity for mils is 70.7 mVRMS.
The gap voltage is halfway between the TX LO and TX HI settings, so the full scale
input signal should be 212.1 mVRMS with an offset of -10 VDC.
Refer to the following diagram for the correct connections between the monitor and the
testing equipment. This diagram shows the typical signal inputs and connections for testing
6600 protection monitors.
Notes:
1.
Ensure that the oscillator frequency is within the monitor passband.
2.
Signal generator output impedance may be significant when compared to 6600 input
impedance. Always verify input signal amplitude with high input impedance DVM at
the monitor terminal strip.
3.
Transducers may be simulated directly at the backplane as shown or elsewhere. If this
involves application via barriers, ensure that the barrier rating is not accidentally
exceeded.
4.
A nonpolarized capacitor may be substituted if required. The polarized capacitor in the
example is for a negative transducer supply voltage.
programmed range
transducer sensitivity (from table)
×
full scale input amplitude
=
3 g
70.7 mVRMS/mil
×
212.1 mVRMS
=
TYPICAL SIGNAL INPUTS FOR TESTING
6652 DSP TWO CHANNEL VIBRATION MONITOR
NON-CONTACT PROBES (403, 1900)
SIGNAL GENERATOR
5 HZ TO 10 kHZ
0-4V RMS (TYPICAL)
SEE ALSO NOTE 4
6652 TERMINALS
50 uF 25 V
10 kOHM
RESISTOR
2 [COMMON]
4 [- 24 VDC]
+
-
+
CAPACITOR POL
1 [ NON-CONTACT
INPUT]
10 kOHM
RESISTOR
