Installation, Operation and Service Manual
LKAT
2
+24V
© 2018 DynAmp, LLC
Page 25
046404 E
5.9 FIELD CONFIGURATION OF TRIP SETPOINTS
Trip setpoints may be re-configured on site for any level between 5% and 100% of full-scale.
The trip polarity may also be re-configured on site. However, the Accuracy Diagnostics trip
setpoint should not be adjusted without consulting the factory.
Refer to assembly drawings for the Main pc board and PE pc board (optional) included at the
end of this manual. To change trip polarity adjust SW2A and SW2B according to the table on
the assembly drawing.
The trip setpoint is proportional to the current where the trip will occur: “Trip Current” – from
Metering Unit nameplate.
The easiest method to check or change trip setpoints is to use the DynAmp LKAT MUT
system which is specifically designed to simplify this process as well as verify proper
operation afterwards.
To configure the trip setpoint without the LKAT MUT or complete test stand, the following
method can be used.
Refer to Table 5.2, “Trip Configuration Details”. Measure the existing setpoint voltage (V
STPT
);
use the equation below to calculate the new setpoint voltage. Adjust coarse and fine
potentiometers to produce calculated New V
STPT.
New Trip Current
New V
STPT
=
Old Trip Current
X Old V
STPT
Example:
Old V
STPT
= 7V
Old Trip Current
= 70kA
New Trip Current = 80kA
80kA
X 7V
= 8V (New V
STPT
)
70kA
Table 5.2
Trip Configuration Details
* Optional
NOTE
The LKAT
2
is supplied with factory configured trip setpoints configured as specified in the
LKAT
2
Worksheet at the time of order. If the trip setpoints are reconfigured in the field, the
customer must realize that the trip setpoints shown on the LKAT
2
Metering Unit nameplate
will no longer be correct. In this case, DynAmp suggests that the nameplate be changed to
reflect the new trip setpoint (following reconfiguration).
Trip Circuit
V
STPT
Location
Medium Adjust
Trimpot
Fine Adjust
Trimpot
1
(Main)
TP6
(Main)
R91
R98
2
(PE)*
TP2
(PE)*
R33
R46
3
(PE)*
TP3
(PE)*
R34
R47
Use TP0 for zero volt reference (circuit common) for voltage measurements for trip setpoint
configuration.
