Operation With Speed Controller; Operation With Transformer; Commissioning - Maico EHD Series Mounting And Operating Instructions

3. Pierce a circular hole into the cable
grommet [7] by means of a grommet
puncher and insert it in the terminal box.
4. Feedpower cable through cable lead-
through [5] and cable grommet [7] into
terminal box. The cable grommet [7]
should surround the cable sheathing
completely; if necessary, seal it on-site.
5. Firmly screw down cable lead-through [5]
and secure power cable in the terminal
box with a tension relief [11].
6. Connect mains to the terminal block
according to the wiring diagram
( in Chapter 15).
7. Fit service switch HS 3 ( catalogue,
 Internet) next to the unit.
8. Fit an On/Off switch provided by the
customer.
9. Connect optional accessory components
( chapter 9.3 or 9.4).
Unit damage due to moisture
NOTICE
in the event of improperly
attached terminal box cover.
The terminal box cover sealing
must be flush all the way round
the terminal box.
10. Fit terminal box cover.
11. Fit upper part of housing [1] and
secure with 3 screws.
9. Installation ‒ Electrical connection │ uk

9.3 Operation with speed controller

EHD 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.

9.4 Operation with transformer

The speed of EHD units can be continuously
adjusted with a suitable transformer (5-step
transformer type ST.. / STU..,  catalogue,
 Internet)

9.5 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 of the unit ( rating plate).
For rating plate  unit,  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 this if necessary.
It is also important that the air can flow
unhindered.
6. Switch off unit.
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