User Guide
Modes of Operation:
i) Under-speed Mode: The relay checks whether the speed of the
monitored system is lower than a particular set-point, defined as Set-
point
Low. R2 is energized when the
frequency of rotation
becomes
lower than Set-Point Low.
ii) Over-Speed Mode: The relay checks whether the speed of the
monitored system is greater than a particular set-point, defined as Set-
Point High. R1 is energized when the frequency of rotation becomes
greater than Set-Point High
iii) Dual-speed Mode: The relay checks whether the speed of the
monitored system is within a particular range, defined as Set-Point
Low to Set-Point High. R2 is energized when the frequency of rotation
becomes lower than Set-point Low. R1 is energized when the frequency
of rotation becomes greater than Set-point High.
Note: Relay 1 has been assigned for Over-speed and Relay 2 has been
assigned for Under-speed by default. These cannot be interchanged.
Both the relays are NOT energized when the connected motor is operating
within the preset range.
Scale Factor:
The user programmable scale factor facilitates the direct reading in
desired engineering unit. The counter multiplies the number of pulses
received at the count input with the scale factor, and displays the result.
Rate display = Number of pulses received per minute x scale factor or No.
of pulses received per hour x scale factor.
The scale factor consists of two parts, mantissa and exponent. The
mantissa can be set from 0.001 to 9.999 and the exponent can be set
from -3 to +2.
The scale factor is arrived at as:
Scale factor = Mantissa X 10
Exponent
Scale Factor cannot be 0 for obvious reasons.
Initial Time Delay (ITD): It is the time required by the motor to gain opti-
mum speed. When the ITD is entered and unit is powered ON, the unit
waits for the ITD to elapse (in addition to TTD) before switching the relay
outputs in case of any unhealthy condition.
Trip Time Delay (TTD): Sometimes the motor speed can go out of range
for a while. In order to avoid the relay tripping due to such momentary
changes in frequency, Trip time delay is provided. The relay trips only if
unhealthy speed ensues after TTD has elapsed.
Relay reset modes: This feature allows one to customize the operating of
both the relay outputs R1 and R2, according to one’s requirement.
Auto-reset: The relay outputs R1 and R2 become de-energized when the
speed of the connected equipment comes back to the prescribed range.
Manual-reset: Once the relay outputs R1 and/ R2 become energized, they
stay energized even after the connected motor or any supported equip-
ment comes back to healthy speed. In order to de-energize the relays, the
user will have to press the assigned key.
R1
R1
R1
ITD
TTD
ITD
TTD
TTD
TTD
R2
Over Speed
Mode
Under Speed
Mode
Dual Speed
Mode
Mode of operation
Healthy
condition
Over
Range
R2
R2
Under
Range
R1 OFF
R1 ON
R2 OFF
R1 ON
R2 ON
R2 ON
R2 OFF
R2 OFF
Dimensional drawings
Siemens Ltd.
Product development is a continuous process. Consequently
the data indicated in this Leaflet is subject to change without
prior notice. For latest issue contact our sales offices.
SACHIN ENTERPRISE
Disposal
Siemens product are environment friendly, which predominantly
consist of recyclable materials.
For disposals we recommend disassembling and separation into
following materials:
METALS: Segregate into Ferrous & Non Ferrous types for recycling
through authorised dealer.
PLASTICS: Segregate as per material type for recycling through
authorised dealer. Because of the long lifetime of Siemens
products the disposal guidelines may be replaced by other national
regulations when taking the product out of service.
The local customer care service is available at any time to answer
disposal-related questions
Customer Care Toll free no. 1800 209 0987
Email: [email protected] Order No.A5E43375408A/AB
