Siemens UL 489 - Handheld Test Device Procedures; Handheld Test Device Overview and Preparations

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9.4 Handheld test device
The handheld test device is used to check that the trip unit, the energy and current transformers, the F5 tripping coil and the measured value
display are functioning properly.
9.4.1 View
(1) LED for operating voltage indication
(2) Control buttons
(3) 6 LEDs to show test results
9.4.2 Preparations
- Open and isolate the circuit breaker
- Document the trip unit setting values of the overload release
- Setting value I
R
= 1.0 I
n
- Interrupt external voltage supply for the electronic system, if present
- Remove the cap from test connector X25 of the trip unit
NOTICE
Circuit breaker may trip.
If the trip settings are changed while the breaker is closed (and under load) the breaker may trip.
Adjust parameters only when the circuit breaker is in the open position.
Cat. No.WLTS, Rev. 0.0 3WL9111-1AT31-0AA0
s
Test Device for WL Electronic Trip Units
TRIP TEST
POWER
CURRENT TRANSFORMER TEST
START
S
I
N
G
= O.K.
L1
L2
L3
N
G
ETU
STATUS
Input 110 ... 125 VAC, 50/60 Hz
0556_nu
(1)
(2)
(3)