Technical File of the EWD-H-P1 Elevator Load Weighing Device [System Introduction] CE
XI'AN Excellent Electromechanical Co. Ltd
http://www.xaest.com
：
(029)88416613、85565714、85568478
Add.: 7D，Block A, Olympic Building, 14th Chang
An North Road, Xi'an, Shaanxi,China
：710061
第
2
—
1
页
Type EWD-H-P1 Elevator Load Weighing Device introdtion manual V2.3
● This system is applicable to all elevators with movable car platform in need of
overload signals. This device is of extremely high performance-price ratio. This appliance is to
overcome the inherent disadvantage of the mechanical overload switch and to replace it.
● Main Property:
1.Working in a contact less and inductive way. No mechanical movement itself. Being directly
installed in the original place of overload switch. No necessity of changing the mechanism of elevator car.
2.Adopting strong inductive magnet, improving the anti-interference of the system to the utmost.
3.The electrical property is in compliance with the standard of the International Electromechanical
Commission (IEC).
4.More accurately positioning, small overall size, easy installation and adjustment, simple structure
and low price.
●
Technical Specification:
⒈
Application Range
Applicable to all elevators with movable car platform in need of overload
signal with a inspection clearance of 8
～
15
㎜
.
2
Sensitivity
Overload turning point
≤
Rated load adjusting point
±
0.05
㎜
3
System Error
≤
1.5% (5
～
40
℃
)
4
Output Mode
1 pair of relay dynamic CLOSE or dynamic OPEN contacts respectively
with the capacity of DC/AC 48V/500mA.
5
Operation Ambient
Temperature
-25
～
55
℃
6
Power Supply
AC/DC 24V(
±
10%)/15mA. The operating current of the whole machine
≤
100 mA.
7
Install Position
Movable elevator car platform
8
Overall Size
Column of
Φ
24
×
83 mm
● Working Principle:
This system weighs the elevator car load based on the principle of the elastic deformation of
movable elevator car platform caused by loading with the HALL sensor measuring the change of
displacement, fulfilling the aim of load weighing.
● Installing Method:
Car platform installation diagram Traction rope head installation diagram
Note:The system connection bracket requires the user to make it according to the specifie situation.
Technical File of the EWD-H-P1 Elevator Load Weighing Device [System Introduction] CE
XI'AN Excellent Electromechanical Co. Ltd
http://www.xaest.com
：
(029)88416613、85565714、85568478
Add.: 7D，Block A, Olympic Building, 14th Chang
An North Road, Xi'an, Shaanxi,China
：710061
第
2
—
2
页
●
Adjustment
1. Please refer to the above figure to install this device with the connecting support (made by the
customer himself) close to the middle part of the car platform as near as possible.
2. Let the magnet adhesive on the car platform with the marking-face right facing the induction point
of the device.
3. Install and adjust this device so that the magnet on the car platform aims at the center point of its
upper face. Meanwhile, assure the end face of this device in parallel with that of the magnet.
4. When elevator is of rated loaded, adjust this device up and down to make the indicator just turn
from dark to bright (or oscillating), at this time, fasten this device and the adjustment is finished.
●
The principle of system wiring:
● Comparison of the functions with other load weighing devices
EWD-H-P1
Mechanical overloading switch
Working
Principle
By the use of Hall sensor, the working way of contactless
induction is realized.
Advantages：①The system doesn’t bear the elevator load
directly, extending its life. ② Overloading signal is of
point turning to position more accurately. ③ No system
damage caused by the insufficiency of overloading
competence or mechanical vibration.
Directly bearing the effect and impact
of elevator load, unstable and
damageable.
Installing and
adjusting
Just adjust the system up and down so that the indicator
will turn from dark to bright. At the turning point, fasten
this device well.
Field adjustment is complicated.
Output signal
A pair of relay dynamic Close and Open contacts
respectively.
Single function
●
Attention : Output wire of this device must not be connected with external power supply to avoid
everlasting damage.
● Others:
Accessory: Inductive magnet [
Φ
20
×
4mm
3
] 1 piece Fastening Nut: 2 sets
If there is any abnormality during adjustment or operation, contact our company directly.
Wire
Function
Explanation
Brown, Blue
System Operating Power
Operating Power
AC/DC24V(
±
10%)/100mA
Black, Gray
Overloading relay dynamic Close contact
Contact Capacity:
DC/AC 48V/500mA
Orange, Purple
Overloading relay dynamic Open contact
1 brown
3 black
6 purple
AC/DC 24V
EWD-H-P1
Principle
Illustration
Inductive Magnet
2 blue
4 gray
5 orange
6 purple
