Explosion Protection In Accordance With Atex; Operating Modes; Technical Data - Wilo Drain MTC 32F Serie Einbau- Und Betriebsanleitung

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The motors have the following monitoring de-
vices:
• Motor chamber leak monitor (MTC 32F17...F33
only):
The leak monitor reports water penetration in the
motor chamber.
• Thermal motor monitor:
The thermal motor monitor protects the motor
winding from overheating. Bi-metal sensors are
used for this as standard.
• Oil separation chamber monitor:
The motor can also be fitted with an external leak
electrode to monitor the oil separation chamber.
It reports water penetrating the oil separation
chamber through the mechanical shaft seal on
the fluid side.
The power cable is 10 m long, is watertight along
its length and has a free cable end.
4.2.3. Sealing
The pump is always sealed against the fluid with
a mechanical seal. Depending on the type of
pump, the motor chamber has a shaft seal ring or
a mechanical seal.
The oil separation chamber between the seals is
filled with medicinal white oil.
The sealing chamber is fully filled with white oil
when the product is assembled.

4.3. Explosion protection in accordance with ATEX

The motors are certified for use in atmospheres at
risk of explosion in accordance with EC directive
94/09/EC, which requires device group II, cate-
gory 2.
The motors can be used in both zone 1 and
zone 2.
These motors may not be used in zone 0!
Non-electrical devices (e.g. hydraulics) also com-
ply with EC directive 94/09/EC.
EXPLOSION hazard!
The housing of the hydraulics must be fully
flooded (completely filled with the pumped
liquid) during operation. If the housing is not
submerged or there is air in the hydraulics,
flying sparks may cause an explosion, for ex-
ample due to static charge! Ensure that dry-
run protection is in place for switching off.
4.3.1. Ex labeling
The II 2G Ex d IIB T4 explosion label on the name
plate indicates the following:
• II = device group
• 2G = device category (2 = suitable for zone 1,
G = gas, vapor, mist)
• Ex = explosion-proof device complying to Euro
norm
• d = ignition protection type for motor casing:
Pressure-resistant encapsulation
• II = intended for places where explosions may
occur, with the exception of mines
36
• B = intended for use with gases in sub-group B
(all gases excluding hydrogen, acetylene, carbon
disulfide)
• T4 = max. surface temperature of the device is
135 °C
4.3.2. "Pressure-resistant encapsulation" protection
type
Motors with this protection type are equipped
with a temperature control system.
The temperature control system should be
connected in such a way that if the temperature
limiter is triggered, it can only be switched back
on after the release button has been manually
activated.
4.3.3. Explosion protection certification number
• MTC 32F17...F33: PTB 99 ATEX 1156
• MTC 32F39...F55: PTB 08 ATEX 1005 X

4.4. Operating modes

4.4.1. Operating mode "S1" (continuous operation)
The pump can operate continuously at the rated
load without exceeding the maximum permissible
temperature.
4.4.2. Operating mode "S2" (short-term operation)
The maximum operating period is given in
minutes, for example, S2-15. The pause must
continue until the machine temperature no longer
deviates from that of the coolant by more than
2 K .
4.4.3. Operating mode S3 (interval operation)
This operating mode defines a combination
of periods of operation and standstill. With S3
operation, the values given are always calculated
based on a period of 10 minutes.
Examples
• S3 20%
Operation 20% of 10 min = 2 min/standstill 80%
of 10 min = 8 min
• S3 3 min
Operation 3 min/standstill 7 min
If two values are given, they relate to each other
e.g.:
• S3 5 min/20 min
Operation 5 min/standstill 15 min
• S3 25%/20 min
Operation 5 min/standstill 15 min

4.5. Technical data

Wilo-Drain MTC 32F
General data
Mains supply [U/f]:
Power consumption [P ]:
1
Rated motor output [P ]:
2
Maximum pump head [H]:
PRODUCT DESCRIPTION
17...33 39...55
3~400 V, 50 Hz
See name plate
See name plate
See name plate
WILO SE 2016-07 V4.0 DIN A4