Wilo Rexa PRO Series, Инструкция по установке и эксплуатации

Страница: 29 / 31

32 WILO SE 2015-07 V05 Letter
US English APPENDIX
This section applies only to Ex-rated pumps and
contains additional instructions for these pumps!
10.2.1. Identification of Ex-rated pumps
Pumps that have been approved for use in an explo-
sive atmosphere are marked as follows on the rating
plate:
• “Ex” symbol for the relevant approval
• Information on Ex classification
10.2.2. FM approval
The motors are certified and approved by the
recognized testing and licensing authority “FM
Approvals” according to standards FM 3600, 3615,
3615.80, and ANSI/UL-1004. The motors are ap-
proved for operation in potentially explosive areas
that require electrical devices with the protection
class “Explosionproof, Class 1, Division 1”.
Operation is therefore also possible in areas with the
required protection class “Explosionproof, Class 1,
Division 2” according to the FM standards.
10.2.3. FM classification
Example of Ex marking:
CLASS I, DIV. 1, GROUPS C, D
CLASS II, DIV. 1, GROUPS E, F, G
CLASS III
TEMPERATURE CODE T3C
Meaning:
• Class 1=gases, fumes, mist
Division 1 = explosive atmosphere constantly or oc -
casionally present under normal conditions
Groups C, D = gas groups: ethylene (C), propane (D)
• Class 2=dust
Division 1 = explosive atmosphere constantly or oc -
casionally present under normal conditions
Groups E, F, G = dust groups: metal (E), carbon (F),
grain (G)
• Class 3=fibers and lint
• T3C=max. surface temperature of the pump 320 °F
(160 °C)
The specifications for the max. immersion depth
and the max. temperature of the fluid are likewise
noted on the rating plate.
“Explosion proof” protection class
Motors in this protection class must be equipped
with a temperature limiter.
10.2.4. Electrical connection
ELECTROCUTION hazard!
Incorrect electrical connections can cause fatal
electric shocks and/or explosion. Electrical con -
nections may only be carried out by a qualified
electrician approved by the local energy supply
company, in accordance with locally applicable
regulations.
In addition to the information in the “Electrical
connection” section, the following points must be
observed for Ex-rated pumps:
• The power supply cable must be connected outside
the potentially explosive area, or inside a housing
with an approved level of ignition protection.
• Voltage tolerance: ±10%
• All monitoring devices outside the “spark-proof
areas” must be connected via an Ex cut-off relay.
We recommend the XR-42x relay for this.
Temperature monitoring device connection
The P 13 motor is equipped with a temperature
limiter (single-circuit temperature monitoring).
As an option, the motor can be fitted with a tem -
perature controller and limiter (2-circuit tempera-
ture monitoring).
The P 17 motor is equipped with a temperature
controller and limiter (2-circuit temperature moni-
toring).
RISK of fatal injury due to incorrect connection!
Risk of explosion due to overheating of the mo-
tor! The temperature monitoring device must be
connected in such a way that, when triggered,
a restart is possible only after the “release but-
ton” is pressed by hand.
• In 2-circuit temperature monitoring, automatic
restarting can be implemented via the temperature
control. The maximum switching frequency (15/h
with a 3-minute pause) must be observed.
• When the threshold for the temperature limit is
reached, the motor must switch off and be locked
from being switched back on!
• Bimetallic strips must be connected via an evalua-
tion relay. We recommend the “CM-MSS” relay for
this. The threshold comes preset.
Connection values: max. 250 V(AC), 2.5 A, cos φ = 1
• PTC sensors (optionally available) must be connect-
ed via an evaluation relay. We recommend the “CM-
MSS” relay for this. The threshold comes preset.
Motor compartment monitoring
• The motor compartment monitor must be con-
nected via an evaluation relay. We recommend the
“NIV 101/A” relay for this. The threshold is 30 kΩ.
When the threshold is reached, the unit must switch
off.
Connection of sealing chamber control
• The pencil electrode must be connected via an
evaluation relay. We recommend the “XR-42x” relay
for this. The threshold is 30 kΩ.
• The connection must be made using an intrinsically
safe electric circuit.
The following connection values must be complied
with:
• Max. 30 Vrms (60 V peak)