Doc#
M9005 • REV N
(May 2017) Page
6 of 12
Startup Trip Delay
Some machines generate vibration levels during startup which are higher than normal
running levels. These high vibration levels can exceed the Alarm Trip Limits which are set
above the normal running vibration level. The standard SW6000 has a fixed time delay which
inhibits alarm trips for 30 seconds from the closing of the startup contacts.
An optional adjustable startup trip delay (1-30 sec.) permits the Alarm Trip Limits to become
operative in less than 30 seconds. Protection of machines with short startup times can be
improved by utilizing the adjustable Startup Trip delay.
The Startup Trip Delay is triggered by closing a set of contacts (momentary or continuous)
connected to the startup terminals. The contacts must be opened before the internal startup
delay timer can be initiated again. Connecting these terminals to a set of isolated auxiliary
N.O. contacts in a motor starter is a method commonly used to initiate the startup trip delay.
The 4-20 mA current output is inhibited (set to 4.0 mA) during the startup trip delay.
Remote Reset Wiring (optional)
If remote reset capability is desired, connect Reset terminals (see Figure 2) to a remotely
located, momentary N.O. pushbutton switch. Observe hazardous area requirements if ap
-
plicable.
4-20 mA Current Source Output (optional)
If the optional 4-20 mA output is installed, it may be connected to a remote receiver, as
shown on the wiring diagram (see Figure 2). This output is a current source (at 15VDC) and
requires no external loop power supply. Full scale current (20 mA) corresponds to the full
scale vibration response marked on the face plate. A current of 4.0 mA represents a zero
vibration condition. The maximum load resistance is 600 ohms. In high electrical noise loca
-
tions a shielded, twisted pair cable is recommended.
FORMULA:
X Full scale vibration = Actual vibration
EXAMPLE:
Measured mA
Full Scale Vibration Actual Vibration
4.0
1.0 ips, peak
0.0 ips, peak
12.0
1.0 ips, peak
0.5 ips, peak
20.0
1.0 ips, peak
1.0 ips, peak
Dynamic Outputs
The sensor (acceleration) signal is available at the terminal block and is capable of driving
a cable with a capacitance of up to 0.03
m
F (typically 300m/1000 feet). Longer runs with
greater than 0.03
m
F of capacitance can be used without the buffer becoming unstable.
However, the frequency response will be reduced due to the increased capacitance.
RECEIVER CONFIGURATION / CALIBRATION
Signal Conditioning Module Output: 4 - 20 mA Source Option
The SW6000 can be factory configured to provide a 4 - 20 mA current source output propor
-
tional to the specified full scale vibration response (velocity or displacement). Figure 5 shows
suggested programming for a 4-20 mA receiver (PLC, DCS, monitor or computer).
Measured mA - 4mA
20mA - 4mA
