Technical data

CHAP-04.10 ELECTRICAL POWER DISTRIBUTION, DRIVES, CONTROL &

ILLUMINATION ELECTRICAL

Page 26 of 50

04.10.13.03. Motorized Damper, Switching Device, Slide Valve, Diverter Gate,

Flap Gate Etc.

The motor will be 3 phase squirrel cage TEFC class F insulated

(temperature rise limited to 70 deg. C. over an ambient of 50 deg. C), IP-

55 enclosure both for motor switches & its terminal box, and with high

starting torque and high stalling torque. The duty cycle will be S2-10 min

or S4/ S5-1200 cycles per hour or S4/ S5-600 cycles per hour depending

upon the rating and application of the actuator.

Each actuator will be provided with 'Open' and 'Close' torque and position

limit switches. Once the torque switch has tripped in either direction, it

can only be reset by operation of the actuator in the opposite direction.

Each switch will have 2 NO + 2 NC potential free double break contacts.

Switch contact ratings on inductive circuits will be 5A AC at 230 V AC.

Actuator will be provided with motor over-riding feature like hand wheel

for emergency manual operation and a limit switch will be provided which

contacts will be used in the motor control circuit to forbid the motorised

operation during manual operation by hand wheel. Also when the motor is

switched 'ON' the hand wheel connection will be disengaged

automatically. Motor operation will always have priority over manual

operation.

Internal wiring will be tropical grade PVC insulated, stranded copper

conductor cable of 10A rating for control circuits and required ratings for

motor. All wires will be clearly numbered at both the terminal block and

component ends. Cable ferrules will be robust and numbers will be

indelible in nature.

The voltage grade of cables/ wires will be 1100V. Power terminals will be

separated from the control terminals by means of an insulating cover.

Separate terminal block fitted to switching unit will be provided. The

terminal box will be designed for the protection class or IP-65. A durable

terminal identification card showing plan or terminals will be provided

attached to the inside of the terminal box cover indicating serial number,

external voltage values, wiring diagram number and terminal layout.

The actuator will be suitable for operation at specified ambient

temperature. All actuators will be neoprene O-ring sealed water tight and

dust proof to IP-67 protection and will at the same time have an inner

watertight neoprene O-ring seal between the terminal box and the internal

electrical elements of the actuator, fully protecting the switch mechanism,

motor and all other internal electrical elements of the actuator from

ingress of moisture and dust when the terminal box cover is removed on

site for cabling/ maintenance.

The actuators will be operated from the Remote Control Station and Local

control station (LCS) will be provided separately for local operation of the