20
Protection
Electric motors of the actuators are fitted with a built-in automatically restoring thermal protection according to ČSN
EN 600034-11. For the actuators type no. 52320 with single-phase electric motors ES 7150-2AL, ES 7130-4AL and
FCJ2B52D, it is connected in series with the electric motor winding; hence, it controls the motor directly and is not con-
nected to the terminal board of the actuator. For other electric motors, the thermal cut-out is connected by two separate
outlet wires to the terminal board of the electric motor and the motor is controlled by means of another device
(contactor,
relay, etc.).
The actuator must be protected by a current circuit breaker with characteristics C set to rated current In according
to table no.1.
Insulation resistance
Before putting into operation or starting an actuator that has not been used for a longer period of time, it is necessary
to check whether insulation conditions have not been deteriorated and whether this cannot cause any risk of damaging to
the winding or an electric shock. Insulation conditions should also be checked during inspections in compliance with provisions
of ČSN 34 3205 and standards valid for explosion-proof electric devices. Insulation resistance of electric control circuits
against frame as well as against each other is min. 20 M
Ω
. Insulation resistance of the electric motor is min
1.9 M
Ω
. Insulation resistance of the transmitter CPT 1A is min. 20 M
Ω
with 50 V DC.
The actuators of lower insulation resistance must not be put into operation. The reason can be in a damaged winding
or excess humidity. Moist motors, the insulation resistance of which is lower than the specified value, must be carefully
dried before being put into operation. The purpose of drying the winding is to get rid of moisture from the insulation and
thus increase insulation resistance to the prescribed value. Drying can be carried out in various ways. Directives for drying
are laid down in the standard ČSN 35 0010 or local recommended methods can be used.
Supply line and wiring
Cable entries into actuators flameproof enclosure are equipped with the followings threaded holes:
a) Actuator - has 2 or 3 threaded entries M20x1,5 or M25x1,5
(see dimensional drawing of actuator)
b) Local control - has 2 threaded entries M20x1,5.
Threaded holes for cable entries are marked M20x1,5 or M25x1,5 in accordance with article 13 of ČSN EN 60079-1.
These entries are sealed by plugs M20x1,5 or M25x1,5.
The customer is obliged to establish electrical connection for direct entry to the flameproof enclosure, that corresponds to the
requirements of ČSN EN 60079-14 and the protective enclosure is at least IP67.
At the customer's request, the manufacturer can supply motors with cable bushing system that meets the requirements of
ČSN EN 60079-14 Article 10.4.2.d for direct entry into flameproof enclosure of group IIC. For entry into actuators flameproof
enclosure are used certified sealed bushings appropriate sizes.
ICG 623/A
M20x1,5;
cable diameter 11,0 – 14,3 mm
ICG 623/B
M25x1,5;
cable diameter 13,0 – 20,2 mm
In case of using bushings ICG customer is obligated to follow the following instructions of sealing individual cable cores when
connecting the actuator.
Summary of Contents for Modact MOKP 100 Ex Series
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