Protection Functions - TeSys H User Guide

Thermal Overload

The TeSys H motor starter protects three-phase motors against overload. If the current exceeds the set value, the motor starter switches off within the specified tripping time and indicates the cause of the trip through the TRIP/ERR LED and the trip and error signaling contact.

NOTE: Overload protection of LZ7H and LZ8H STO starters is ATEX-certified up to SIL 2.

NOTE: Only LZ7H and LZ8H motor starters that bear the

marking on the left can be used to protect motors in an explosive atmosphere.

DANGER
HAZARD OF Explosion in explosive atmosphere The device is associated equipment and must not be installed in potentially explosive areas. When installing and operating associated equipment, the applicable safety directives must be observed. Observe the safety regulations that are applicable when motors are used in the Ex area (ATEX directive 94/9/EC). In circuits in potentially dust-explosive areas of zones 21 and 22, it must be guaranteed that the equipment connected to this circuit complies with category 2D or 3D or is certified as such. For safety technical data, refer to this document and certificates (EC-type examination certificate, and other approvals if appropriate). Conformance/approvals: EC type-examination certificate II (2) G [Ex e] [Ex d] [Ex px] II (2) D [Ex t] [Ex p] PTB certification: refer to file number on product nameplate marked devices only Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF Explosion in explosive atmosphere

The device is associated equipment and must not be installed in potentially explosive areas. When installing and operating associated equipment, the applicable safety directives must be observed.

Observe the safety regulations that are applicable when motors are used in the Ex area (ATEX directive 94/9/EC).
In circuits in potentially dust-explosive areas of zones 21 and 22, it must be guaranteed that the equipment connected to this circuit complies with category 2D or 3D or is certified as such.
For safety technical data, refer to this document and certificates (EC-type examination certificate, and other approvals if appropriate).

Conformance/approvals:

EC type-examination certificate
II (2) G [Ex e] [Ex d] [Ex px]
II (2) D [Ex t] [Ex p]
PTB certification: refer to file number on product nameplate
marked devices only

Failure to follow these instructions will result in death or serious injury.

WARNING
hazard OF INADEQUATE MOTOR PROTECTION The current setting of the TeSys H motor starter must be adapted in accordance with the motor to be protected. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Phase Unbalance

The TeSys H motor starter protects three-phase motors against phase unbalance.

If motor currents differ from each other by more than 33%, the motor starter switches off the motor in 2 minutes and indicates the cause of the trip through the TRIP/ERR LED.
If motor currents differ from each other by more than 67%, the motor starter switches off the motor in 1.8 seconds and indicates the cause of the trip through the TRIP/ERR LED.

Phase Loss

The TeSys H motor starter protects three-phase motors against phase loss.

Phase loss is detected through current measurements while the motor is running.

When phase loss occurs, the motor starter switches off the motor after 1.5 to 2 s.

Phase loss is indicated by the TRIP/ERR LED and the trip signaling contact.

Stall and Jam Detection

The TeSys H motor starter protects three-phase motors against the following events:

Jam during startup
Stall during running

If the current exceeds 45 A for more than 2 s, the TeSys H motor starter switches off the motor and indicates the cause of the trip through the TRIP/ERR LED and trip signaling contact.

Diagnostic Functions

The following errors are detected by the TeSys H motor starter:

Two or more phases are missing.
No motor is connected.
On at least two phases, the motor current is lower than the minimum configurable current for more than 2 s.