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8. Installation
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Electrical connection
9
NOTICE
Danger of short-circuits and
damage to the unit.
Water/dampness may
penetrate the terminal box if
the power cable is
introduced incorrectly
(leaking) or if the cable
grommet is not fitted
correctly.
Pierce cable grommet such
that it can fully surround the
power cable and makes close
contact in the terminal box.
3. Pierce cable grommet [8] in terminal box
with a nozzle pin.
4. Guide the power cable into the terminal
box such that the cable grommet fits
around the cable sheathing completely.
If necessary, seal the cable grommet on-
site.
5. Wire fan to the terminal block according to
the wiring diagram (
chapter 13). Note
the screws' tightening torque of 0.7 Nm.
6. Secure power cable with tension relief [7]
to ensure that the power cable is seated
firmly.
7. On ERK .. T units, set the unit overrun
time with potentiometer [9] (setting range 3
to 15 minutes).
8. Fit optional on/off switch.
9. Connect other optional accessory
components (
chapters 8.3 and 8.4).
NOTICE
Unit damage due to moisture
in the event of improperly
attached terminal box cover.
1. The terminal box cover
sealing must be flush all the
way round the terminal box.
2. Tighten screws to a tightening
torque of 1.0 Nm.
10. Fit terminal box cover.
8.3 Speed control with speed
controller
ERK units (other than ERK .. T units) can be
controlled in an infinitely variable manner
using a speed controller appropriate to the
unit type (
online,
catalogue).
The technology used in the phase
angle controller may cause humming
noises.
NOTICE
The fan will stop and suffer
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.
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