Ezd: Operation With Speed Controller; Ezd And Dzd: Operation With Transformer; Commissioning; Maintenance - Maico EZD .. BL Serie Betriebsanleitung

uk │ 7. Installation - Electrical connection
7.3 EZD: Operation with speed
controller
EZD units can be continuously adjusted with
a speed controller suitable for the unit type
( catalogue,  internet).
The technology used in the phase
angle controller may cause humming
noises.
The fan will stop and suffer
NOTICE
functional problems if the
output voltage on the speed
controller is too low.
1. Observe information in the
speed controller operating
instructions.
2. Always set the minimum
speed on the speed controller
such that the fan motor starts
up again after power failure.
7.4 EZD and DZD: Operation with
transformer
The speed of the EZD and DZD units can be
continuously adjusted with a transformer
suitable for the unit type (5-step transformer,
type TR...)  catalogue,  internet.

7.5 Commissioning

1. Check that all screw connections are tight.
2. Check air channel for dirt and clean if
necessary.
3. Check that connection data matches
technical data ( rating plate) on the unit.
For rating plate  unit or  instructions
envelope.
4. Remove protection against switching back
on and switch on mains fuse.
5. Run function test. Check that the impeller
runs quietly and ensure if necessary. It is
also important that the air can flow
unhindered.
6. Switch off unit.
18

8. Maintenance

The unit is maintenance-free. If maintenance
work is required, please observe the
following:
Danger to life from electric
shock.
Prior to access to the connection
DANGER
terminals, switch off all supply
circuits. Move service switch to
the "Off" position and protect
against switching back on again.
Danger of injury from rotating
impeller after switching off.
Switch service switch to "Off"
DANGER
position before removing the roof
cowl. Wait until the impeller is
stationary.
Risk of cuts from metal
housing plates with sharp
edges.
CAUTION
Wear protective gloves.

9. Fault rectification

● Call on the services of a trained electrician
any time there is a fault.
● Repairs should only be carried out by a
trained electrician.
Danger to life from electric
shock.
Prior to access to the connec-
DANGER
tion terminals switch off all
supply circuits. Switch off
mains fuse, secure against
being accidentally switched
back on and position a visible
warning sign.