Outputs; Emergency Start; Restart Disable - ABB REM 610 Technical Reference Manual

REM 610 REM 610
5.1.1.3.
5.1.1.4.
5.1.1.5.
20
Motor Protection Relay
Technical Reference Manual - ANSI Version
The functions of the digital inputs are determined with the SGB switches. For
details, refer to Section 5.2.1. Input/output connections and Table 5.1.4.12.-8,
Table 5.2.1.-1 and Table 5.2.1.-5.

Outputs

The relay is provided with:
Three trip output contacts (PO1, PO2 and PO3)
*
Two non-trip contacts (SO1 and SO2)
*
Switchgroups SGR1...5 are used for routing internal signals from the protection
elements, the motor start-up signal and the external trip signal to the desired non-trip
or trip output contact. The minimum pulse length can be configured to be 40 or 80
ms and the trip output contacts can all be configured to be latched.

Emergency start

The emergency start function allows motor start ups although the restart disable has
been activated. The function is activated in SGB1...5. The emergency start will be
activated when the selected digital input is energized and will remain active for ten
minutes. On the rising edge of the emergency start signal
the calculated thermal level will be set slightly below the restart disable level to
*
allow at least one motor start up
the value of the register of the cumulative start-up time counter will be set
*
slightly below the set restart disable value to allow at least one motor start up
the set trip values of temperature elements 49/38-1 and 49/38-2 will be increased
*
by 10 per cent
the external restart disable signal will be ignored.
*
The set trip values of elements 49/38-1 and 49/38-2 will be increased by ten per cent
and the external restart disable signal ignored for as long as the emergency start is
activated. A new emergency start cannot be made until the emergency start signal
has been reset and the emergency start time of ten minutes has expired. Activation
of the emergency start signal will generate an event code, which cannot be masked
out from the event reporting.

Restart disable

The restart disable signal is used to disable motor start ups when the motor is
overheated, for instance. The restart disable signal is routed to PO3 by default, but
can be deselected in SGF1. The signal will be activated when any of the following
conditions exists:
the trip signal from any protection element is active
*
the restart disable signal from the thermal protection element is active
*
the restart disable signal from element 66 is active
*
the external restart disable signal is active
*
1MRS755537