11. SITE INSPECTION VM-5S
-80-
• This section describes the main inspection and verification steps from completion
of the zero-speed monitoring system to start-up. For adjustment and operation of
machines, make sure to read the instruction manuals supplied with the machines.
11-1 VERIFICATIONS IN STOPPED CONDITION
(1) Verification of Interconnections
Verify that all interconnections have been carried out properly (refer to 4.
INTERCONNECTION on page 5). Make it a point to verify that connector insulations, cable
terminations, and terminal screws are properly installed.
If 4-wire shielded cable is used for signal transmission, ground wires not used at the monitor to
prevent mixing-in of noise.
(2) Verification of Set Gap
1) Verify the set gap at the highest point of the target. At the same time, measure the set gap
voltage at the output connection of the VM-5S monitor.
• Set gap voltage Must be -15V or more (closer to 0V end)
(at highest point of target)
If the set gap voltage is lower than -15V, the trigger level becomes inadequate (due to
frequency characteristics of the driver), which may be interpreted as zero tachometer output.
Make the step gap narrower in such a case.
2) Next measure the set gap voltage at the lowest point of the target.
• Set gap voltage Must be less than -21V (farther from 0V end)
(at lowest point of target)
• Turning the rotor by hand to verify the set gap voltage at the highest and
lowest point of the target may present certain difficulties. It is recommended,
however, to do it at this point as problems developing later many be more
difficult to deal with.
VM-5S
4-wire shielded cable
Driver
Extension
cable
Sensor
IN
COM
-24V
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