First Use; Description Of The Connection Terminals; Steps For Connection - WEG GRT7-TH4-R2 Manual De Instalación, Operación Y Mantenimiento

www.weg.net

13 FIRST USE

The GRT7-TH4 R2 Voltage Regulator should be handled by a properly trained technician. Before doing any connections check
that the regulator is appropriate for the generator at hand. Check also the existing protections.

13.1 DESCRIPTION OF THE CONNECTION TERMINALS

E1: Sensing voltage (Low voltage).
GRT7-TH4 R2 AM/220M = 160 to 300Vac (Single phase).
GRT7-TH4 R2 EM/220M = 180 to240Vac (Single phase).
GRT7-TH4 R2 GM/110M = 85 to 140Vac (Single phase).
E2: Sensing voltage (high voltage).
GRT7-TH4 R2 AM/220M = 320 to 600Vac (Single phase).
GRT7-TH4 R2 EM/220M = 520 to 640Vac (Single phase).
GRT7-TH4 R2 GM/110M = 170 to 280Vac (Single phase).
3: Power supply.
E3/4: Voltage supply, and reference (or common) of the regulator. Common also for inputs E1 and E2.
A-: Analog voltage input –9Vcc.
A+: Analog voltage input +9Vcc.
UP: Increase voltage through digital input.
CM: Digital input reference.
DW: Decreases voltage through digital input.
S1: Connection for pole S1 of the CT
S2: Connection for pole S2 of the CT
F+ e F-: Connection for generator field.
JHz : Jumper 50/60 Hz (JHz 1-2 = 50 Hz, JHz 2-3 = 60 Hz).
: Connection for external adjustment potentiometer (Two terminals).
NOTE
1. These are optional items. Terminals may not be present on regulator versions without analog and
digital inputs.
2. It is recommended to use a multi-turn potentiometer.

13.2 STEPS FOR CONNECTION

Connect the wires coming from the generator according to the description on 9 and the type of generator to be used.
Before the generator is turned on the primary mover should be started and run at rated speed.
The generator should start without load. The potentiometer Vad for Voltage adjustment should be configured to the minimum
voltage to avoid generator runaway in case of incorrect connections.
The Stb potentiometer for stability should be placed in the middle of its course. This potentiometer acts on the dynamic
response of the machine and does not affect normal steady state operation.
The U/F Potentiometer for adjustment of the U/F protection should be maintained with the factory configuration since all units
are tested and configured before leaving the factory. If there are problems starting the generator with U/F actuated, it can be
configured during operation.
Turn on the start key. Field flashing should take less than 3 seconds. If there is not field flashing or if the fuse blows, check
item 15 before contacting the manufacturer.
After starting, regulate Stb stability Potentiometer, applying and taking out load until reaching the point where voltage does not
oscillate (or has the lowest oscillation) with load variation.
24 l Automatic Voltage Regulator – GRT7-TH4-R2
(1)
(1)
(1)
(1)
(1)