gefran GT 120A Скачать руководство пользователя страница 5

Notes on use of the GT with the digital On/Off control 

CALIBRATION PROCEDURE OF THE INTERRUPTED LOAD ALARM

The interrupted load alarm function enables the GT to diagnose a variation of the load current (compared to a set limit),

distinguishing it from one caused by a change in grid voltage. The solid state power unit must therefore be supplied with the

voltage applied to the load terminals, i.e.: LOAD (L2): already connected internally;

LINE (or i): connect terminal for voltages from 150 to 300V; connect terminal for voltages from 300 to 530V.

The alarm activates (relay closed and yellow alarm LED on) when the current, during the conduction of the device, falls below

a preset level that may be adjusted using the trimmer on the faceplate.

Calibration procedure (refer to the faceplate description drawing)

1) Use the adjustment system (or a calibrator) in order to supply the maximum signal (100% conduction or thered “ON” LED

always illuminated). As an alternative, you can configure the GT to 0-10 V DC input configuration and connect terminals 5 

and 6.

2) Use a current sensing pliers to check that the load current is at rated level.

3) Turn alarm limit adjustment trimmer (g) fully clockwise. Check that yellow alarm LED (b) turns on.

4) Slowly turn trimmer (g) counterclockwise until the alarm LED turns off.

5) Turn the trimmer counterclockwise another 1/10 of a turn (1 notch on the scale). 

In this way, the alarm limit is set below 10% of the rated load current.

N.B:

the partial load break alarm function operates with power partialization exceeding 15%. For partializations below 20%, tripping

times increase due to the reduced load activation time. For correct operation of the option, the load current has to exceed 30%

of rated current for the GT.

- The logic control signal has to be connected with the correct polarities to terminals 4 and 5 of the analog input. 

- Turn minimum adjustment trimmer (d) fully counterclockwise and maximum adjustment trimmer (e) fully clockwise.

- Set the 3 dip switches (f) to off. 

For applications with a very short work cycle, you can drive the solid state group by means of the Master/Slave signal by

driving it with a digital signal (OFF = 0 V dc; ON = from 4 V dc to 10 V dc)

Inhibiting the GT

You can inhibit operation of the GT by means of the Master/Slave signal.

To inhibit, connect control signal - (4) with the synchronism signal for Master/Slave connection (3).

Notes on use of the GT in Master/Slave configuration 

The GT can be used as a master to drive other solid state groups (slaves). With Master/Slave signal (3), you can drive up to 9

GTs (see connection examples for GT solid state power relays with three-phase load). You can also use a GT to drive GS solid

state power relays (maximum of 2), as shown in the connection diagrams for GT/GS solid state power relays with three-phase

load (attention: the HB option cannot be used for a three-phase application with neutral).  

Содержание GT 120A

Страница 1: ...ermediate values The units offer optional accessoires for panel mounting fuses and fuseholders current transformer isolation transformers Use the rel with an opportune heatsink see section accessories...

Страница 2: ...h junction ambient 12 K W Solid State Relay Dissipated Power Calculation Singol phase static relay Pds 1 4 IRMS W IRMS singol phase load current Heatsink thermal resistance Calculation Rth 90 C T amb...

Страница 3: ...ifferent cycle times 100msec and 40msec respectively V V Example of input at 20 2V IN 0 10V or 4mA IN 0 20mA V Voltage across load Example of input at 50 5V IN 0 10V or 10mA IN 0 20mA V Voltage across...

Страница 4: ...ge for potentiometer power supply 10V 24 Vac 50 60 Hz power terminal The solid state power unit Gt is supplied factory calibrated for 0 5V 0 10V 0 20mA 4 20mA 10Kohm potentiometer Minimum and maximum...

Страница 5: ...ther 1 10 of a turn 1 notch on the scale In this way the alarm limit is set below 10 of the rated load current N B the partial load break alarm function operates with power partialization exceeding 15...

Страница 6: ...PLES L2 h L1 i Master AL PWR Line 230 V GT 25A 480 Vac e Max Adj d Min Adj c Reset Alarm f Input selection g Alarm Adj Line 30 Vdc ac ON 2 Out Alarm 1 Slave 3 Line 480 V 0 10V 0 20mA 4 20mA 0 5V AC1 5...

Страница 7: ...6 7 8 10 Vdc 24 Vac Supply Out Input Analog 1 2 3 Out 30 Vdc ac Alarm Master Slave ON PWR AL 4 20mA d Min Adj AC1 50 60 Hz GT 25A 480 Vac 0 20mA c Reset Alarm L1 h i L2 0 5V 0 10V Load Line 480 V f In...

Страница 8: ...th neutral Controller Relay output Alarm solid state relay Digital output 0 20mA 4 20mA 0 10Vdc 0 5Vdc Three phase connection triangle or star without neutral with control of two phases using one GT i...

Страница 9: ...es thermostats current transformers and isolation transformers To choose accessories see the section Solid state relays Accessories Fuse Fuse Fuse TABLE OF TERMINALS AND CONDUCTORS 25 40A 6 3x9 Eye fo...

Страница 10: ...y from dust humidity corrosive gases and heat sources The connection cable must be shorter than 3 meters if the current transformer is used Maintenance Check the correct operation of the cooling fans...

Отзывы: