00198150-02_SM_TX_en - 第41页

3 SMPS 3.4 Checking For Absence of Voltage Service Manual SIPLACE TX Series 06/2017 41 The following figure explains the LED status of the PS1 power pack (300 VDC): Fig.30: LED status PS1-PS2 300VDC Monitoring the volt…

3 SMPS

3.4 Checking For Absence of Voltage

40 Service Manual SIPLACE TX Series 06/2017

Measurement with known reference voltage

To conclude the self-test, check the voltage tester with a known reference voltage.

You can use the service socket on the power supplier (disabled with "110V option") or any other

electrical socket.

Measure the voltage present between the pins and at PE (ground).

Fig.28: Test with reference voltage

Measuring the voltage absence directly after switching machine off

When the machine has been switched off, the full voltage is still present at the measurement points

X303 (in) and X304 (out).

Measurement is always performed at the reference point X305 (GND)!

► Pull the power supply out towards the front (see 3.2 "Pulling out the Power Supply" [}35]).

Fig.29: Measuring points

1. Measuring points at power supply

Test 300V IN_X303-X305:

Currently present voltage

Test 300V OUT_X304-X305:

LED display Output 1 at AC/DC converter

Green: Voltage over 220V

The power pack shows an LED display for out-

put 1 > 220 V in green, which means that the

voltage is still over 220 V!

3 SMPS

3.4 Checking For Absence of Voltage

Service Manual SIPLACE TX Series 06/2017 41

The following figure explains the LED status of the PS1 power pack (300 VDC):

Fig.30: LED status PS1-PS2 300VDC

Monitoring the voltage absence after switch-off

The voltage at the measurement points X303 (IN PS1/PS2) and X304 (OUT CAP) only discharges

slowly.

After switch-off, the voltage drops from 300VDC to under 5VDC in approx. five minutes.

Fig.31: Measuring voltage

As soon as the voltage has undershot a value of 220VDC, the LED display on the power pack

changes!

3 SMPS

3.4 Checking For Absence of Voltage

42 Service Manual SIPLACE TX Series 06/2017

Fig.32: Measuring voltage

DANGER

Measurement values below 5VDC

Measure between the following points:

► X303 (IN) – X305 (GND) < 5VDC

► X304 (OUT) – X305 (GND) < 5VDC

Fig.33: LED on the capacitor battery(CAP)

► Check the LED on the capacitor battery

(CAP).

 DANGER!

Once the LED on the capacitor battery

(CAP) does not light any longer, it is pos-

sible to work on the power supply without

hazard!