One side of the secondary of all CTs must be earthed. The earth connection should be made on the side of the secondary facing the protected object. The polarity of the CTs must be in accordance with the following diagram.
DANGER - HIGH VOLTAGE
When commissioning the control, please observe all safety rules that apply to the handling of live
equipment. Ensure that you know how to provide first aid in the event of an uncontrolled release of energy and that you know where the first aid kit and the nearest telephone are. Never touch any live components of the system or on the back of the system:
L I F E T H R E A T E N I N G
CAUTION
Only a qualified technician may commission unit. The "EMERGENCY-STOP" function must be operational prior to commissioning of the system, and must not depend on the unit for its operation.
CAUTION
Prior to commissioning ensure that all measuring devices are connected in correct phase sequence.
The connect command for the unit circuit breaker must be disconnected at the unit circuit breaker. The
field rotation must be monitored for proper rotation. Any absence of or incorrect connection of voltage
measuring devices or other signals may lead to malfunctions and damage the unit, the engine, and/or
components connected to the unit!
Prerequisite
Connect the unit according to the wiring diagram on Page 9.
Pre-adjustments
In order to put the unit into operation, you must
1. • connect the auxiliary 24Vdc power supply (terminals 13/14),
2. • activate the configuration mode (press "Digit↑" and "Cursor→"),
3. • set all parameters according to the Chapter "Configuration"
4. • activate the Automatic mode (press "Digit↑" and "Cursor→").
Commissioning using primary values
During commissioning, a configuration should be found which allows the finest possible adjustment of the currents. If the current is to flow through a short-circuiting bridge, the automatic voltage regulator should be turned
off and the generator excitation adjusted manually.
Testing for correct connection
The excitation should be set so that the generator is loaded to approx. 20% rated current. If the connections are
correct, the displayed differential current should be about zero. The displayed restraint current should be checked
using an external measuring device. Record all measured values.
If the displayed restraint currents are not approximately equal or very high differential currents are being displayed, then the system should be turned off and the configuration of the CTs should be checked.
