Melitta LOOK - Commissioning Tests: Voltage Setting Verification; Measuring Pick-up and Drop-off Voltages

15
4.5.4 Voltage setting check
The pick-up and drop-off voltages of the relay should be measured with the timer set
to 0.1s and with the voltage setting switches set to each of the positions shown in the
table below.
1 = switch closed (left hand position)
0 = switch open (right hand position)
Table 1
Switch position Pick-up voltage (VRMS)
MVTU 11 MVTU 11 MVTU 11 MVTU 11 MVTU 12 MVTU 12 MVTU 12 MVTU 12 MVTU 13/18
Switch 1 2 3 4 5 6 57/70V 100/120V 220/250 380/440V 57/70V 100/120V 220/250 380/440V 57/120V
Test 1 0 0 0 0 0 0 32 62 135 210 60 105 230 400 5
Test 2 1 0 0 0 0 0 33 63.5 138 216 61.5 107.5 235 410 6
Test 3 0 1 0 0 0 0 34 65 141 222 63 110 240 420 7
Test 4 0 0 1 0 0 0 34 65 141 222 63 110 240 420 7
Test 5 0 0 0 1 0 0 34 65 141 222 63 110 240 420 7
Test 6 0 0 0 0 1 0 40 74 159 258 72 125 270 480 13
Text 7 1 1 1 1 1 1 63 108.5 228 396 106.5 182.5 385 710 36
When the switches have been set for each test, the cover should be replaced to
ensure that the trip indicator is always reset with the cover reset mechanism (where
applicable).
The relays should be connected as shown in the circuit diagrams, Figures 1, 2 and 3.
Figure 1 Test circuit for MVTU 13, 18 and for 57/70V, 110/120V versions of MVTU 11
and MVTU 12
27
28
1
3
5
V
Start
timer
SW1
Test resistor
for MVTU 13
Stop
timer