the terminals should be open indicating the contacts are operating
normally. Remove the bell set or resistance measuring apparatus,
rewire the relay terminals and reset the relay for normal operation.
Maintenance
1.
Remove power from device before performing any maintenance.
- 2. Keep magnet mating surfaces free of accumulated dirt or dust.
3.
DO NOT OIL OR GREASE
the magnet mating surfaces.
4. Contacts are carefully designed for maximum life. They need only
be replaced when nearly all the silver tip is gone and the contact
tip support is exposed.
DO NOT FILE
the contacts. Filing or
otherwise dressing the contacts only results in lost tip material
and reduces life of the contacts.
5. Periodically check all wiring for tightness.
6. On reversing and two-speed starters, the mechanical interlock
has been factory adjusted and normally should never need read
justment. If readjustment is ever needed, these steps should be
followed:
A Close one contactor by hand by pushing down on armature.
8. Using the other hand, loosen the nut on opposite contactor in
terlock arm and slide lt towards the top of the elongated slot
until all gap is taken up between the two arms. Follow the
same procedure with the opposite contactor and interlock arm.
Figure 3.
Renewal Parts
Ref. No.
Description
1
Coil retainer assembly
C. Best adjustment is usually obtained when both mechaniCar JO�
terlock arm assemblies are as far up in the elongated slot as
possible.
D. With both arms adjusted, there should be a very slight gap
{approximately 1/16-lnch) between the arms with both contac
tors open. Neither arm should overlap the other with both con
tactors open.
Caution: Before adjusting or operating reverser, make sure the
mechanical interlock arm is engaged with movable arm.
Replacement Coils
For two- and three-pole devices, order coil catalog number 55-530249G
plus number in table below.
For four- and five-pole devices, order coil catalog number 55-501493G
plus number in table below.
Example: 55-530249G002 is rated 115-120 V, 60 Hz/110 V, 50 Hz.
Frequency
115-
200-
230-
--
460-
575-
(Hertz)
120 V
208 V
240 V
480 V
600 V
60
002
023
003
--
004
005
Frequency
110 V
--
220 V
380 V
440 V
550 V
(Hertz)
50
002
--
003
064
004
005
Accessory Kits
First NO aux. cont. for CR305, CR306 {right side mtg.) ..... CR305XSOOA
First NC aux. cont. for CR305, CR306 (right side mtg.) ..... CR305X500B
First NO-NC aux. cont. for CR305, CR306 (right side mtg.). CR305X500C
Additional NO aux. cont. tor all forms,
. CR305X100D
Additional NC aux. cont. for all forms
.. _ .CR305X100E
Pushbutton . .
. ........................... CR305X520B
Selector Switch, H-0-A.
. . CR305X530B
Selector Switch, OFF-ON.
. CR305X530D
Indicating Light . .............. ., ...................... CA305X550B
Fifth pole (for adding to 4-po!e form on!y).
. ........... CR305X511B
Control Circuit Fuse .......................... CR305X541A, B, C, D
Surge Suppressor.
. . CA305X146C
Catalog Number
Quantity Required
55-1546078003
4
2
Overload relay (3-heater, non-compensated form, 1 NC contact)
CR3248310F
1
3
Overload relay (3-heater, non-compensated form, 1 N0-1 NC contact)
CR3248360F
1
4
Set of stationary & movable contacts with springs & screws for three-poles
55-1546078041
1
5
Molded cover for three-poles
55-5302458001
3
6
Return spring for movable arm
55-1532058002
1
7
Molded movable arm with return spring for 2-, 3-po!e
55-1546078042
1
8
Armature and frame (magnet) with retainer
55-1546078045
1
9
Operating coil for 2- and 3-pole
55-5302498*
*
*
1
10
Retainer for armature
55-1546070046
1
***
Insert numbers for particular coil rating required. See Coil Table above.
These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation,
operation, or maintenance. Should particular problems arise which are not covered sufficiently for the Purchaser's purposes, the matter should be referred lo the nearest
ABB sales office.
1SQC912028M0201
GEH-4839C,
February 2020
2
—
ABB Inc.
305 Gregson Drive
Cary, NC 27511.
—
We reserve the right to make technical
changes or modify the contents of this
document without prior notice. With
regard to purchase orders, the agreed
particulars shall prevail. ABB Inc. does not
accept any responsibility whatsoever for
potential errors or possible lack of
information in this document.
We reserve all rights in this document and
in the subject matter and illustrations
contained therein. Any reproduction or
utilization of its contents – in whole or in
parts – is forbidden without prior written
consent of ABB Inc.
Copyright© 2019 ABB
All rights reserved
electrification.us.abb.com
