Operation Of Sed2 In The Event Of Fire - Siemens SED2 Application Manual

Activation of ESM
Difference between
ESM and normal opera-
tion
Definition of the SED2s
behavior in ESM
12 / 44
Siemens
Building Technologies
3.4

Operation of SED2 in the event of fire

The new firmware V1.40 actively supports operation in the event of fire. The focus
is clearly on the above mentioned overpressure plants, which can be easily imple-
mented through the use of speed-controlled fans. The change from comfort to fire
operation is accomplished by the Essential Service Mode (ESM). For use with the
SED2, this function has been completely revised and extended.
The ESM function was also available with former firmware versions of the SED2,
but has been constantly optimized based on experience made in the field and
feedback received from the Regional Companies (RC). This means that V1.40 in-
cludes all findings made thus far so that the SED2 also represents state of the art
as far as ESM is concerned.
ESM can be activated via digital inputs DIN1...6. Hence, the ESM function must be
assigned to one of these inputs.
Typically, the signal is delivered by the fire control panel. In that case, "ES" appears
on the BOP display, which alternates with the motor's frequency.
When the command for ESM is deactivated again, the SED2 will resume normal
operation.
The primary objective of ESM is to ensure fan operation "under all circumstances".
As soon as ESM is activated, the SED2 starts its operation independently of the
operating state predefined by the building automation and control system. This
means that ESM is given priority over normal operation. In addition – when us-
ing ESM – the protective VSD functions (soft errors and warnings), such as over-
temperature or faulty communication, will be suppressed and the hard errors, such
as overvoltage and overcurrent, acknowledged an infinite number of times and the
motor restarted. The hard errors must not be suppressed and ignored!
It is possible to define any setpoint as the ESM setpoint. The flexibility of the SED2
allows this unlike other competitor drive that can only supply a fixed frequency set-
point in Fire-Mode. However, a fixed-frequency (e.g. maximum frequency) is the
most common setpoint and this can easily be configured.
Sometimes, ESM also calls for controlled operation (internal PID), when full over-
or low-pressure operation is not permitted because it shall still be possible to open
or close doors. When using ESM, it is also possible to reverse the motor's direction
of rotation.
For that purpose, V1.40 offers a new parameter with 2 control words. These control
words are used to define the behavior in ESM. The following applications can be
implemented, either individually or in combination:
• Running to a defined fixed speed
• PID control with a defined fixed setpoint
• PID control with a preselected setpoint via analog input or bus
• Reversal of the direction of rotation
Application Guide «Fire Mode»
Introduction
CM1A5192en_01
23.10.2007