QT2B/QT4/QT8/QTF series crane control consoleDetailed product description：

Scope of application
The QT4 QT8 QTF series crane control console is mainly used in control circuits for AC 50HZ (60HZ), 380V (440) and below, to control the starting, speed regulation, braking, and reversing of the electric motors of lifting and transportation machinery.  

Model meaning



Structural features and working principle

The structure of the console consists of left and right control boxes and seats (optional). The control console lever drives the camshaft to rotate through gear transmission, achieving the requirement of contact closure. The front, back, left, and right positions can meet the actual usage requirements. It is divided into 1-6 gears, and each console can simultaneously control four mechanism contact groups, namely the lifting mechanism, the crane mechanism, the trolley mechanism (amplitude changing mechanism), the slewing mechanism, etc. Each contact group can be equipped with multiple contacts, and the number of contacts is shown in Table 1. The QT4 and QTf crane control consoles are equipped with automatic reset mechanisms.

Table 1

model	QT2B	QT4	QT8	QTF
Number of contacts (maximum)	twelve	eight	14 (lifting mechanism)	eight
Gear (maximum)	six	five	six	five

Performance and technical data

4.1. The console is suitable for the following working conditions:
a、 The ambient air temperature has an upper limit of+40 ℃ and a lower limit of -5 ℃, with an average value not exceeding+35 ℃ within 24 hours;
b、 The installation location has clean air, with a relative humidity not exceeding 50% at a maximum temperature of+40 ℃, and the relative humidity can be increased at lower temperatures;
c、 The altitude of the installation site shall not exceed 2000m;
d、 Vertical installation, with a tilt angle not exceeding 5 °;
e、 The quality of the power grid is qualified, and the fluctuation range of the incoming voltage does not exceed ± 10% of the rated voltage value;
f、 The pollution level of the console is level 3, and the installation category is class III;  g、 The protection level of the console shell is lp30.
4.2. The rated working current of the control panel is shown in Table 3

Table 3

model	QT2B	QT4	QT8	QTF
Rated working current (A)	2．6	2．6	2．6	one

4.3. The console is suitable for intermittent working mode, with a basic load factor of 40% and a rated operating frequency. The operating force of the handle is shown in Table 4

Table 4

model	QT2B	QT4	QT8	QTF
Operating frequency (times/h)	six hundred	one thousand and two hundred	one thousand and two hundred	three hundred
Operating force (N)	≤30	≤25	≤25	≤30

4.4. The electrical and mechanical lifespan of the console is shown in Table 5
Table 5

model	QT2B	QT4	QT8	QTF
Mechanical lifespan (10000 cycles)	300 (150 contact mechanism)	three hundred	three hundred	three hundred
Electrical lifespan (10000 cycles)	one hundred	one hundred	one hundred	sixty

Note: The operation handle runs from zero position to one direction to the terminal, and then returns to zero position once. The mechanical life value should be evenly distributed in all four directions of operation.  
External dimensions and installation dimensions

Refer to Figure 1 and Table 2

model	L1	L2	H	L3×L4	D
QT2B	nine hundred and eight	seven hundred and sixty	one thousand and forty-three	600×280	Ф12
QT4	nine hundred	seven hundred and sixty	nine hundred and ninety	270×150	Ф11
QT8	eight hundred and fifty-two	seven hundred and sixty	nine hundred and ninety	270×150	Ф11
QTF	seven hundred and fifty	five hundred	nine hundred and eighty	270×150	Ф11

Figure 1

Usage and maintenance

6.1 Open box inspection: Check whether the appearance is intact and undamaged, whether the operating mechanism is flexible, whether the zero position self-locking is reliable, and whether the wiring is consistent with the electrical schematic.
6.2. The console with zero position self-locking must be operated by pulling the self-locking lever with fingers. It is strictly prohibited to forcefully operate without pulling up the self-locking rod.
6.3 Generally, the contacts of the control panel should be cleaned once a year. When cleaning the contacts, a cotton swab dipped in anhydrous alcohol can be used for scrubbing. Regularly inspect the fasteners of the operating mechanism and contact mechanism.
Transportation and storage conditions

7.1 During transportation and storage, it should be protected from rain and snow, and the storage location should be well ventilated and dry.
During transportation and storage, the temperature condition of the control console is -25~+55 ℃, and the temperature can reach+70 ℃ for a short period of time (24 hours).