HQ Series Quarter-turn Electric Actuator
Installation Operation& Maintenance Manual
Doc No. : HumG-HQ-21 Rev2
Page 19 / 26
Valve Automation Leader, HKC
certain values defined as inputs while other values are outputs, such as current temperature or valve
position.
5.2.5.
Specification
①
Communication Protocol : Modbus-RTU according to IEC 61158 and IEC 61784
②
Topology : Line topology with termination
③
Number of nodes : 32 nodes in each segment without repeater, with repeaters expandable to 247
④
Number of repeaters : Max. 9 with signal refreshing
⑤
Cable length : Max. 1.2 Km with Repeater 10 Km
⑥
Transfer Mode : RS-485
⑦
Transmission Medium : Twisted, shielded 2-Wire cable according to IEC 61158
⑧
Bus Access : Polling between master and slaves (query response)
⑨
Supported Baud Rates : 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
⑩
Supported Parity Bit : Odd, Even, None
⑪
Supported Stop Bit : 1, 2
For more detail information, please refer to separate ModBus operation manual. –18 rev1]
6.
Wiring
6.1.
Electrical Connections and Preliminary Test
WARNING: [You must never do any welding work while the actuator is connected with electrical
line. If an electrical shock occurs on the actuator, it makes a cause of serious damage to the
microprocessor of the actuator.----- 19 Rev0]
When working in potentially explosive atmospheres, observe the European Standards EN 60079-14
“Electrical Installation in Hazardous Areas” and EN 60079-17 “Inspection and Maintenance of
Electrical Installations in Hazardous Areas”. Work on the electrical system or equipment must only
be carried out by a skilled electrician himself or by specially instructed personnel under the control
and supervision of such an electrician and in accordance with the applicable electrical engineering
rules.
For cable entries that are not used, user or installer shall close by [Ex db IIC or Ex tb IIIC certified
blanking element suitable for each type of protection, Ex db or Ex tb so that type of protection of
the enclosure is maintained. ----- 17 Rev0]
[Dust ignition proof enclosure! Use a damped cloth for equipment surface cleaning. --- 15 Rev1]
[
Flame
proof enclosure! ---17 Rev0] Treat cover with care. Gap surfaces must not be damaged in
any way. Do not jam cover during fitting.
[Dust ignition proof enclosure! It may be charged electrostatic potential. Therefore it shall be
installed in such way that the risk from electrostatic discharge and propagation brush discharge
caused by rapid flow of dust is avoided. --- 15 Rev.1]
6.1.1.
For testing purposes, loosen the bolts on the actuator cover and remove the cover.
6.1.2.
Make sure that the power supply voltage is in accordance with the data on the nameplate of the
actuator.
6.1.3.
[Pass cables through the cable glands: NPT 3/4” or M25 for Ex “db”, additionally NPT 3/4”, M25
and M20 with M30 insert which shall be only applied for Ex ”tb”. ----- 17 Rev0]
6.1.4.
Connect wires according to the enclosed wiring diagram.
6.1.5.
Manually move the valve to half-open position. Then electrically operate the actuator to fully open
position and check if the motor rotates in correct direction; standards units are counter-clockwise to
open.
6.1.6.
Test the actuator and check whether the limit switches work correctly
6.1.7.
After the testing, check that all cable glands are correctly tightened. Applicable cable glands should
be selected to meet the application’s condition. It is recommended to use the grade of IP67 cable
gland or higher in potentially explosive atmosphere.
6.1.8.
Put carefully the cover on the body and tighten the bolts.
6.1.9.
[Tightening torque of the cover bolts should be applied as below.
Model
Cover bolt size (mm)
Tightening Torque
Allowable range
HQ-008/010
M8 x 35
12.5 Nm
10 ~ 15 Nm
HQ-015/020
M10 x 50
24.5 Nm
20 ~ 30 Nm
HQ-030~300
M12 x 55
42.0 Nm
35 ~ 50 Nm
LCU-B, LCU-C
M8 x 35
12.5 Nm
10 ~ 15 Nm
---------------- 20 r1]