SKF CMSS 60 - Power Requirements; CMSS 600, CMSS 606 and CMSS 620-2 Drivers; CMSS 665, CMSS 665 P, CMSS 668 and CMSS 668 P Drivers; Wiring Connections

Power requirements
CMSS 600, CMSS 606 and CMSS 620-2
Drivers
Usually the monitor system used with the probe
provides this power, however, any adequate
power supply can be used. Each driver needs
35 mA. For example, four eddy probe drivers
require 4 x 35 mA = 140 mA.
Voltage can vary from -18 to -26 Vdc.
Operation below -24 Vdc can reduce the probe’s
operating range. See Figure 4-2.
CMSS 665, CMSS 665P, CMSS 668 and CMSS
668P Drivers
Voltage can vary from -24 to -32 Vdc and
each driver requires 15 mA. Voltages beyond
this range will seriously affect the calibration
accuracy.
All the power requirements are usually supplied
from installed instrumentation or may be
supplied using SKF DIN-rail mounted power
supply model CMSS 31123300. This power
supply is rated at 0.175 amperes.
Wiring connections
Figure 4-3 shows the electrical and signal
connections for the CMSS 600, CMSS 606, and
CMSS 620-2 Eddy Probe Drivers.
Figure 4-2. Effects of power supply voltage on linearity.
Gap (mils)
220
210
200
190
180
170
Sensitivity vs. Gap
-24 Vdc
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
Eddy Probe Gap: mm
Gap (mils)
Output
(Volts)
Sensitivity
(mV/mil)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
± 5%
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100 110 120
-18 Vdc
-18 Vdc
-24 Vdc
NOTE: Performance specifications
are based on 4140 stainless
steel target.
0
0.25 0.50
Section 4 – Driver installation
4-2
Figure 4-3. Electrical and signal connections for probe drivers (CMSS 600, CMSS
606, and CMSS 620-2).
Extension Cable
PROBE
CUSTOMER I.D.
-24V�COM� OUTPUT
CAL
MODEL CMSS 606
SERIAL NO.
MADE IN USA
Shield
To Monitor System
Eddy Probe