SEW MOVITRAC LTP series, Руководство по эксплуатации

Страница: 21 / 80

Operating Instructions – MOVITRAC® LTP
21
5
Installation
Electrical Installation
The 230 V and 400 V drives do not require a line choke on the supply unless the spec-
ified supply voltages cannot be guaranteed.
Drives from 0.37 kW (0.5 HP) to 5.5 kW (7.5 HP) must be fitted with external line chokes
if the quality of the supply cannot be guaranteed.
An external line choke is always required for 575 V drives from 0.75 kW (1 HP) to 5.5 kW
(7.5 HP).
All drives with 7.5 kW (10 HP) or greater have a built-in choke and therefore do not need
external chokes fitted to ensure transient protection.
An external choke is required if 230 V or 400 V drives up to 5.5 kW (7.5 HP) are installed
under the following conditions:
• Local generator
• Large loads on the same supply
• High dV / dt voltage fluctuations e.g. when welders are being used
• Outdoor pumping stations with exposed supply lines, which may be hit by lightening
strikes.
Always switch off the brake on the DC and AC sides with:
• All hoist applications
• Drives that require a rapid brake response time
It is essential to adhere to the connection sequence of the brake connector. Incorrect
connection will lead to irreparable damage to the brake. The connection to the brake
rectifier requires a separate supply system cable. Supply from the motor voltage is not
permitted.
If the brake rectifier is installed in the switch cabinet the connecting cable between the
brake rectifier and the brake must be routed separately to other power cables. Routing
together with other cables is only permitted if the other cables are shielded. Set P2-13
to 3 to use the relay output to control the brake rectifier (BGx).
5.2.3 Motor thermal protection (TF / TH)
Motors with an internal PTC over-temperature sensor (TF, TH or similar) can be con-
nected directly to the MOVITRAC
®
LTP. A trip will then be displayed on the drive.
The sensor is connected to terminal 1 (+24 V) and Digital Input 3. Parameter P2-01 must
be set to external trip input to receive over-temperature trips. The trip level should be set
to 2.5 k
Ω
.
NOTE
• Connect the brake rectifier using a separate supply system lead.
•
Supply via the motor voltage is not permitted!